ETC IT8702F

IT8702F
Super – Low Pin Count Input / Output
(LPC I/O)
Preliminary Specification V0.5
ITE TECH. INC.
Specification subject to Change without notice, AS IS and for reference only. For purchasing, please
contact sales representatives.
Copyright © 2004 ITE Tech. Inc.
This is Preliminary document release. All specifications are subject to change without notice.
The material contained in this document supersedes all previous documentation issued for the related
products included herein. Please contact ITE Tech. Inc. for the latest document(s). All sales are subject to
ITE’s Standard Terms and Conditions, a copy of which is included in the back of this document.
All sales are subject to ITE’s Standard Terms and Conditions, a copy of which is included in the back of this
document.
ITE, IT8702F is a trademark of ITE Tech. Inc.
Intel is claimed as a trademark by Intel Corp.
Microsoft and Windows are claimed as trademarks by Microsoft Corporation.
PCI is claimed as a trademark by the PCI Special Interest Group.
IrDA is claimed as a trademark by the Infrared Data Association.
All other trademarks are claimed by their respective owners.
All specifications are subject to change without notice.
Additional copies of this manual or other ITE literature may be obtained from:
ITE Tech. Inc.
Marketing Department
8F, No. 233-1, Bao Chiao RD., Hsin Tien,
Taipei County 231, Taiwan, R.O.C.
Phone:
Fax:
(02) 29126889
(02) 2910-2551, 2910-2552
If you have any marketing or sales questions, please contact:
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Or e-mail [email protected] for more product information/services
Revision History
Revision History
Section
Revision
Page No.
4
Added a PCIRST5# function.
7, 8
5
Added ATXPG pin and revised the PWROK circuit to add two AND
inputs, SUSB# and ATXPG.
19
5
Added 2 extra sets FAN_TAC4, 5 and FAN_CTL4, 5.
5
Changed the pad types of MCLK, MDAT, KCLK and KDATA from
DIOD16 to DIOD24.
18
6
Changed the chip version register from 06h to 07h.
34
6
Added a PWROK1/2 delay time selection register for option.
35
6
Changed the default value of the pin multi-function selection of pin-84.
38
6
Changed the default value of FAN_CTL’s PWM clock into 22~27Khz.
75
11
Figure 11-12 was revised.
153
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7, 8, 10, 11
IT8702F V0.5
Contents
CONTENTS
1. Features
................................................................................................................................................ 1
2. General Description ....................................................................................................................................... 3
3. Block Diagram................................................................................................................................................ 5
4. Pin Configuration ........................................................................................................................................... 7
5. IT8702F Pin Descriptions .............................................................................................................................. 9
6. List of GPIO Pins ......................................................................................................................................... 21
7. Power On Strapping Options and Special Pin Routings ............................................................................. 23
8. Configuration .............................................................................................................................................. 25
8.1 Configuring Sequence Description ................................................................................................... 25
8.2 Description of the Configuration Registers ....................................................................................... 27
8.2.1 Logical Device Base Address .............................................................................................. 32
8.3 Global Configuration Registers (LDN: All) ........................................................................................ 34
8.3.1 Configure Control (Index=02h)............................................................................................. 34
8.3.2 Logical Device Number (LDN, Index=07h) .......................................................................... 34
8.3.3 Chip ID Byte 1 (Index=20h, Default=87h) ............................................................................ 34
8.3.4 Chip ID Byte 2 (Index=21h, Default=02h) ............................................................................ 34
8.3.5 Configuration Select and Chip Version (Index=22h, Default=07h) ...................................... 34
8.3.6 Clock Selection Register (Index=23h, Default=00h) ............................................................ 34
8.3.7 Software Suspend (Index=24h, Default=00h, MB PnP)....................................................... 35
8.3.8 GPIO Set 1 Multi-Function Pin Selection Register (Index=25h, Default=01h) .................... 35
8.3.9 GPIO Set 2 Multi-Function Pin Selection Register (Index=26h, Default=00h) .................... 36
8.3.10 GPIO Set 3 Multi-Function Pin Selection Register (Index=27h, Default=00h) .................... 36
8.3.11 GPIO Set 4 Multi-Function Pin Selection Register (Index=28h, Default=40h) .................... 37
8.3.12 GPIO Set 5 Multi-Function Pin Selection Register (Index=29h, Default=00h) .................... 37
8.3.13 Extended 1 Multi-Function Pin Selection Register (Index=2Ah, Default=00h) .................... 38
8.3.14 Logical Block Lock Register (Index=2Bh, Default=00h) ...................................................... 39
8.3.15 Extended 2 Multi-Function Pin Selection Register (Index=2Ch, Default=1Fh).................... 39
8.3.16 Test 1 Register (Index=2Eh, Default=00h) .......................................................................... 40
8.3.17 Test 2 Register (Index=2Fh, Default=00h)........................................................................... 40
8.4 FDC Configuration Registers (LDN=00h) ......................................................................................... 41
8.4.1 FDC Activate (Index=30h, Default=00h) .............................................................................. 41
8.4.2 FDC Base Address MSB Register (Index=60h, Default=03h) ............................................. 41
8.4.3 FDC Base Address LSB Register (Index=61h, Default=F0h).............................................. 41
8.4.4 FDC Interrupt Level Select (Index=70h, Default=06h)......................................................... 41
8.4.5 FDC DMA Channel Select (Index=74h, Default=02h) ......................................................... 41
8.4.6 FDC Special Configuration Register 1 (Index=F0h, Default=00h)....................................... 41
8.4.7 FDC Special Configuration Register 2 (Index=F1h, Default=00h)....................................... 42
8.5 Serial Port 1 Configuration Registers (LDN=01h) ............................................................................ 43
8.5.1 Serial Port 1 Activate (Index=30h, Default=00h).................................................................. 43
8.5.2 Serial Port 1 Base Address MSB Register (Index=60h, Default=03h) .................................. 43
8.5.3 Serial Port 1 Base Address LSB Register (Index=61h, Default=F8h)................................... 43
8.5.4 Serial Port 1 Interrupt Level Select (Index=70h, Default=04h) ............................................ 43
8.5.5 Serial Port 1 Special Configuration Register 1 (Index=F0h, Default=00h) .......................... 43
8.5.6 Serial Port 1 Special Configuration Register 2 (Index=F1h, Default=50h) .......................... 44
8.5.7 Serial Port 1 Special Configuration Register 3 (Index=F2h, Default=00h) .......................... 44
8.5.8 Serial Port 1 Special Configuration Register 4 (Index=F3h, Default=7Fh) .......................... 44
8.6 Serial Port 2 Configuration Registers (LDN=02h) ............................................................................ 45
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8.6.1 Serial Port 2 Activate (Index=30h, Default=00h).................................................................. 45
8.6.2 Serial Port 2 Base Address MSB Register (Index=60h, Default=02h) .................................. 45
8.6.3 Serial Port 2 Base Address LSB Register (Index=61h, Default=F8h)................................... 45
8.6.4 Serial Port 2 Interrupt Level Select (Index=70h, Default=03h) ............................................ 45
8.6.5 Serial Port 2 Special Configuration Register 1 (Index=F0h, Default=00h) .......................... 45
8.6.6 Serial Port 2 Special Configuration Register 2 (Index=F1h, Default=50h) .......................... 46
8.6.7 Serial Port 2 Special Configuration Register 3 (Index=F2h, Default=00h) .......................... 46
8.6.8 Serial Port 2 Special Configuration Register 4 (Index=F3h, Default=7Fh) .......................... 46
8.7 Parallel Port Configuration Registers (LDN=03h)............................................................................. 47
8.7.1 Parallel Port Activate (Index=30h, Default=00h).................................................................. 47
8.7.2 Parallel Port Primary Base Address MSB Register (Index=60h, Default=03h)..................... 47
8.7.3 Parallel Port Primary Base Address LSB Register (Index=61h, Default=78h) .................... 47
8.7.4 Parallel Port Secondary Base Address MSB Register (Index=62h, Default=07h)................ 47
8.7.5 Parallel Port Secondary Base Address LSB Register (Index=63h, Default=78h) ............... 47
8.7.6 Parallel Port Interrupt Level Select (Index =70h, Default=07h) ........................................... 47
8.7.7 Parallel Port DMA Channel Select (Index=74h, Default=03h) ............................................. 47
8.7.8 Parallel Port Special Configuration Register (Index=F0h, Default=03h) ............................. 48
8.8 FAN Controller Configuration Registers (LDN=04h) ........................................................................ 49
8.8.1 FAN Controller Activate Register (Index=30h, Default=00h) ............................................... 49
8.8.2 FAN Controller Base Address MSB Register (Index=60h, Default=02h) .............................. 49
8.8.3 FAN Controller Base Address LSB Register (Index=61h, Default=90h) ............................... 49
8.8.4 PME Direct Access Base Address MSB Register (Index=62h, Default=02h) ....................... 49
8.8.5 PME Direct Access Base Address LSB Register (Index=63h, Default=30h) ........................ 49
8.8.6 FAN Controller Interrupt Level Select (Index=70h, Default=09h) ........................................ 49
8.8.7 APC/PME Event Enable Register (PER) (Index=F0h, Default=00h) ................................... 49
8.8.8 APC/PME Status Register (PSR) (Index=F1h, Default=00h) .............................................. 50
8.8.9 APC/PME Control Register 1 (PCR 1) (Index=F2h, Default=00h)....................................... 50
8.8.10 FAN Controller Special Configuration Register (Index=F3h, Default=00h) ......................... 51
8.8.11 APC/PME Control Register 2 (PCR 2) (Index=F4h, Default=00h)....................................... 51
8.8.12 APC/PME Special Code Index Register (Index=F5h).......................................................... 51
8.8.13 APC/PME Special Code Data Register (Index=F6h)........................................................... 51
8.9 KBC (keyboard) Configuration Registers (LDN=05h)....................................................................... 52
8.9.1 KBC (keyboard) Activate (Index=30h, Default=01h or 00h) ................................................ 52
8.9.2 KBC (keyboard) Data Base Address MSB Register (Index=60h, Default=00h) .................. 52
8.9.3 KBC (keyboard) Data Base Address LSB Register (Index=61h, Default=60h) ................... 52
8.9.4 KBC (keyboard) Command Base Address MSB Register (Index=62h, Default=00h)......... 52
8.9.5 KBC (keyboard) Command Base Address LSB Register (Index=63h, Default=64h).......... 52
8.9.6 KBC (keyboard) Interrupt Level Select (Index=70h, Default=01h) ...................................... 52
8.9.7 KBC (keyboard) Interrupt Type (Index=71h, Default=02h) .................................................. 53
8.9.8 KBC (keyboard) Special Configuration Register (Index=F0h, Default=00h) ............................ 53
8.10 KBC (mouse) Configuration Registers (LDN=06h)........................................................................... 53
8.10.1 KBC (mouse) Activate (Index=30h, Default=00h)................................................................ 53
8.10.2 KBC (mouse) Interrupt Level Select (Index=70h, Default=0Ch) ............................................. 53
8.10.3 KBC (mouse) Interrupt Type (Index=71h, Default=02h) ...................................................... 53
8.10.4 KBC (mouse) Special Configuration Register (Index=F0h, Default=00h) ........................... 54
8.11 GPIO Configuration Registers (LDN=07h) ....................................................................................... 55
8.11.1 SMI# Normal Run Access Base Address MSB Register (Index=60h, Default=00h)........... 55
8.11.2 SMI# Normal Run Access Base Address LSB Register (Index=61h, Default=00h)............ 55
8.11.3 Simple I/O Base Address MSB Register (Index=62h, Default=00h).................................... 55
8.11.4 Simple I/O Base Address LSB Register (Index=63h, Default=00h)..................................... 55
8.11.5 Panel Button De-bounce Base Address MSB Register (Index=64h, Default=00h) ............. 55
8.11.6 Panel Button De-bounce Base Address LSB Register (Index=65h, Default=00h) .............. 55
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8.11.7 Panel Button De-bounce Interrupt Level Select Register (Index=70h, Default=00h) .......... 55
8.11.8 Watch Dog Timer Control Register (Index=71h, Default=00h) ............................................ 55
8.11.9 Watch Dog Timer Configuration Register (Index=72h, Default=00h) .................................. 56
8.11.10 Watch Dog Timer Time-Out Value Register (Index=73h, Default=00h) .............................. 56
8.11.11 GPIO Pin Set 1, 2, 3, 4 and 5 Polarity Registers (Index=B0h, B1h, B2h, B3h and B4h,
Default=00h)......................................................................................................................... 56
8.11.12 GPIO Pin Set 1, 2, 3, 4 and 5 Pin Internal Pull-up Enable Registers (Index=B8h, B9h, BAh,
BBh and BCh, Default=00h)................................................................................................. 56
8.11.13 Simple I/O Set 1, 2, 3, 4 and 5 Enable Registers (Index=C0h, C1h, C2h, C3h and C4h,
Default=01h, 00h, 00h, 40h, and 00h) ................................................................................. 56
8.11.14 Simple I/O Set 1, 2, 3, 4 and 5 Output Enable Registers (Index=C8h, C9h, CAh, CBh and
CCh, Default=01h, 00h, 00h, 40h, and 00h) ........................................................................ 57
8.11.15 Panel Button De-bounce Control Register (Index=D0h, Default=00h) ................................ 57
8.11.16 Panel Button De-bounce Set 1, 2, 3, 4 and 5 Enable Registers (Index=D1h, D2h, D3h,
D4h and D5h, Default=00h) ................................................................................................. 57
8.11.17 IRQ3-7, 9-12 and 14-15 External Routing Input Pin Mapping Registers (Index=E3h-E7h,
E9h-ECh and EEh-EFh, Default=00h) ................................................................................. 57
8.11.18 SMI# Control Register 1 (Index=F0h, Default=00h)............................................................. 57
8.11.19 SMI# Control Register 2 (Index=F1h, Default=00h)............................................................. 58
8.11.20 SMI# Status Register 1 (Index=F2h, Default=00h) .............................................................. 58
8.11.21 SMI# Status Register 2 (Index=F3h, Default=00h) .............................................................. 58
8.11.22 SMI# Pin Mapping Register (Index=F4h, Default=00h) ....................................................... 58
8.11.23 Reserved Register (Index=F5h, Default=00h) ..................................................................... 59
8.11.24 Reserved Register (Index=F6h, Default=00h) ..................................................................... 59
8.11.25 Keyboard Lock Pin Mapping Register (Index=F7h, Default=00h) ....................................... 59
8.11.26 GP LED Blinking 1 Pin Mapping Register (Index=F8h, Default=00h).................................. 59
8.11.27 GP LED Blinking 1 Control Register (Index=F9h, Default=00h) .......................................... 59
8.11.28 GP LED Blinking 2 Pin Mapping Register (Index=FAh, Default=00h) .................................. 59
8.11.29 GP LED Blinking 2 Control Register (Index=FBh, Default=00h).......................................... 59
8.11.30 VID Input Register (Index=FCh, Default=--h)....................................................................... 60
8.11.31 VID Output Register (Index=FDh, Default=00h) .................................................................. 60
8.12 MIDI Port Configuration Registers (LDN=08h) ................................................................................. 61
8.12.1 MIDI Port Activate (Index=30h, Default=00h) ...................................................................... 61
8.12.2 MIDI Port Base Address MSB Register (Index=60h, Default=03h)....................................... 61
8.12.3 MIDI Port Base Address LSB Register (Index=61h, Default=00h)........................................ 61
8.12.4 MIDI Port Interrupt Level Select (Index=70h, Default=0Ah) ................................................ 61
8.12.5 MIDI Port Special Configuration Register (Index=F0h, Default=00h) .................................. 61
8.13 Game Port Configuration Registers (LDN=09h) ............................................................................... 62
8.13.1 Game Port Activate (Index=30h, Default=00h) .................................................................... 62
8.13.2 Game Port Base Address MSB Register (Index=60h, Default=02h) .................................... 62
8.13.3 Game Port Base Address LSB Register (Index=61h, Default=01h) ..................................... 62
8.14 Consumer IR Configuration Registers (LDN=0Ah)........................................................................... 63
8.14.1 Consumer IR Activate (Index=30h, Default=00h) ................................................................ 63
8.14.2 Consumer IR Base Address MSB Register (Index=60h, Default=03h)................................. 63
8.14.3 Consumer IR Base Address LSB Register (Index=61h, Default=10h).................................. 63
8.14.4 Consumer IR Interrupt Level Select (Index=70h, Default=0Bh) .......................................... 63
8.14.5 Consumer IR Special Configuration Register (Index=F0h, Default=00h)............................ 63
9. Functional Description ................................................................................................................................. 65
9.1 LPC Interface .................................................................................................................................... 65
9.1.1 LPC Transactions................................................................................................................. 65
9.1.2 LDRQ# Encoding ................................................................................................................. 65
9.2 Serialized IRQ ................................................................................................................................... 65
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9.3
9.4
9.5
9.2.1 Continuous Mode ................................................................................................................. 65
9.2.2 Quiet Mode ........................................................................................................................... 66
9.2.3 Waveform Samples of SERIRQ Sequence.......................................................................... 66
9.2.4 SERIRQ Sampling Slot ........................................................................................................ 67
General Purpose I/O ......................................................................................................................... 68
Advanced Power Supply Control and Power Management Event (PME#) ...................................... 70
FAN Controller .................................................................................................................................. 71
9.5.1 Interfaces.............................................................................................................................. 71
9.5.2 Registers .............................................................................................................................. 71
9.5.2.1 Address Port (Base+05h, Default=00h): ................................................................. 71
9.5.2.2 Register Description ................................................................................................ 73
9.5.2.2.1
Configuration Register (Index=00h, Default=18h) ........................... 73
9.5.2.2.2
Interrupt Status Register 1 (Index=01h, Default=00h)..................... 73
9.5.2.2.3
Reserved Register (Index=02h, Default=00h) ................................. 73
9.5.2.2.4
Reserved Register (Index=03h, Default=00h) ................................. 73
9.5.2.2.5
SMI# Mask Register 1 (Index=04h, Default=00h) ........................... 74
9.5.2.2.6
Reserved Register (Index=05h, Default=00h) ................................. 74
9.5.2.2.7
Reserved Register (Index=06h, Default=00h) ................................. 74
9.5.2.2.8
Interrupt Mask Register 1 (Index=07h, Default=00h) ...................... 74
9.5.2.2.9
Reserved Register (Index=08h, Default=00h) ................................. 74
9.5.2.2.10
Reserved Register (Index=09h, Default=00h) ................................. 74
9.5.2.2.11
VID Register (Index=0Ah) ................................................................ 74
9.5.2.2.12
Fan Tachometer Divisor Register (Index=0Bh, Default=09h).......... 74
9.5.2.2.13
Fan Tachometer 16-bit Counter Enable Register (Index=0Ch,
Default=00h)
..................................................................................................... 74
9.5.2.2.14
Fan Tachometer 1-3 Reading Registers (Index=0Dh-0Fh) ............. 75
9.5.2.2.15
Fan Tachometer 1-3 Limit Registers (Index=10h-12h).................... 75
9.5.2.2.16
Fan Controller Main Control Register (Index=13h, Default=00h) .... 75
9.5.2.2.17
FAN_CTL Control Register (Index=14h, Default=50h).................... 75
9.5.2.2.18
FAN_CTL1 PWM Control Register (Index=15h, Default=00h or 40h).
..................................................................................................... 76
9.5.2.2.19
FAN_CTL2 PWM Control Register (Index=16h, Default=00h or 40h).
..................................................................................................... 76
9.5.2.2.20
FAN_CTL3 PWM Control Register (Index=17h, Default=00h or 40h).
..................................................................................................... 76
9.5.2.2.21
Fan Tachometer 1-3 Extended Reading Registers (Index=18h-1Ah) .
..................................................................................................... 76
9.5.2.2.22
Fan Tachometer 1-3 Extended Limit Registers (Index=1Bh-1Dh) .. 76
9.5.2.2.23
Vendor ID Register (Index=58h, Default=90h) ................................ 77
9.5.2.2.24
Code ID Register (Index=5Bh, Default=12h) ................................... 77
9.5.2.2.25
Beep Event Enable Register (Index=5Ch, Default=00h) ................. 77
9.5.2.2.26
Beep Frequency Divisor of Fan Event Register (Index=5Dh,
Default=00h)
..................................................................................................... 77
9.5.2.2.27
Fan Tachometer 4-5 Reading LSB Registers (Index=80h,82h) ...... 77
9.5.2.2.28
Fan Tachometer 4-5 Reading MSB Registers (Index=81h,83h) ..... 77
9.5.2.2.29
Fan Tachometer 4-5 Limit LSB Registers (Index=84h,86h) ............ 77
9.5.2.2.30
Fan Tachometer 4-5 Limit MSB Registers (Index=85h,87h) ........... 77
9.5.2.2.31
FAN_CTL4 PWM Control Register (Index=88h, Default=00h) ........ 77
9.5.2.2.32
FAN_CTL5 PWM Control Register (Index=89h, Default=00h) ........ 78
9.5.3 Operation.............................................................................................................................. 78
9.5.3.1 Power On RESET and Software RESET ................................................................ 78
9.5.3.2 Fan Tachometer ...................................................................................................... 78
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9.6
9.7
9.5.3.3 Interrupt of the FAN Controller ................................................................................ 78
Floppy Disk Controller (FDC)............................................................................................................ 79
9.6.1 Introduction........................................................................................................................... 79
9.6.2 Reset .................................................................................................................................... 79
9.6.3 Hardware Reset (LRESET# Pin).......................................................................................... 79
9.6.4 Software Reset (DOR Reset and DSR Reset)..................................................................... 79
9.6.5 Digital Data Separator .......................................................................................................... 79
9.6.6 Write Precompensation ........................................................................................................ 79
9.6.7 Data Rate Selection ............................................................................................................. 79
9.6.8 Status, Data and Control Registers...................................................................................... 80
9.6.8.1 Digital Output Register (DOR, FDC Base Address + 02h)...................................... 80
9.6.8.2 Tape Drive Register (TDR, FDC Base Address + 03h) .......................................... 80
9.6.8.3 Main Status Register (MSR, FDC Base Address + 04h) ........................................ 80
9.6.8.4 Data Rate Select Register (DSR, FDC Base Address + 04h)................................. 81
9.6.8.5 Data Register (FIFO, FDC Base Address + 05h).................................................... 82
9.6.8.6 Digital Input Register (DIR, FDC Base Address + 07h) .......................................... 82
9.6.8.7 Diskette Control Register (DCR, FDC Base Address + 07h) .................................. 83
9.6.9 Controller Phases................................................................................................................. 83
9.6.9.1 Command Phase ..................................................................................................... 83
9.6.9.2 Execution Phase...................................................................................................... 83
9.6.9.3 Result Phase ........................................................................................................... 83
9.6.9.4 Result Phase Status Registers................................................................................ 84
9.6.10 Command Set ...................................................................................................................... 86
9.6.11 Data Transfer Commands.................................................................................................... 96
9.6.11.1 Read Data................................................................................................................ 96
9.6.11.2 Read Deleted Data .................................................................................................. 97
9.6.11.3 Read a Track ........................................................................................................... 97
9.6.11.4 Write Data................................................................................................................ 97
9.6.11.5 Write Deleted Data .................................................................................................. 97
9.6.11.6 Format A Track ........................................................................................................ 97
9.6.11.7 SCAN....................................................................................................................... 98
9.6.11.8 VERIFY.................................................................................................................... 99
9.6.12 Control Commands .............................................................................................................. 99
9.6.12.1 READ ID ................................................................................................................ 100
9.6.12.2 Configure ............................................................................................................... 100
9.6.12.3 RE-CALIBRATE..................................................................................................... 100
9.6.12.4 SEEK ..................................................................................................................... 101
9.6.12.5 RELATIVE SEEK................................................................................................... 101
9.6.12.6 DUMPREG ............................................................................................................ 101
9.6.12.7 LOCK ..................................................................................................................... 101
9.6.12.8 VERSION............................................................................................................... 101
9.6.12.9 SENSE INTERRUPT STATUS.............................................................................. 102
9.6.12.10 SENSE DRIVE STATUS ....................................................................................... 102
9.6.12.11 SPECIFY ............................................................................................................... 102
9.6.12.12 PERPENDICULAR MODE .................................................................................... 103
9.6.12.13 INVALID................................................................................................................. 104
9.6.13 DMA Transfers ................................................................................................................... 104
9.6.14 Low Power Mode................................................................................................................ 104
Serial Port (UART) Description....................................................................................................... 105
9.7.1 Data Registers.................................................................................................................... 105
9.7.2 Control Registers: IER, IIR, FCR, DLL, DLM, LCR and MCR ........................................... 105
9.7.3 Status Registers: LSR and MSR........................................................................................ 111
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9.7.4 Reset .................................................................................................................................. 113
9.7.5 Programming...................................................................................................................... 113
9.7.6 Software Reset................................................................................................................... 113
9.7.7 Clock Input Operation......................................................................................................... 113
9.7.8 FIFO Interrupt Mode Operation.......................................................................................... 114
9.8 Smart Card Reader......................................................................................................................... 116
9.8.1 Features ............................................................................................................................. 116
9.8.2 Operation............................................................................................................................ 116
9.8.3 Connection of IFD to ICC Socket ....................................................................................... 116
9.8.4 Baud Rate Relationship Between UART and Smart Card Interface.................................. 117
9.8.5 Waveform Relationship ...................................................................................................... 117
9.8.6 Clock Divider ...................................................................................................................... 117
9.8.7 Waveform Example of Activation/Deactivation Sequence ................................................. 118
9.8.8 ATR and PTS Structure...................................................................................................... 119
9.8.9 Smart Card Operating Sequence Example........................................................................ 120
9.9 Parallel Port..................................................................................................................................... 121
9.9.1 SPP and EPP Modes ......................................................................................................... 121
9.9.2 EPP Mode Operation ......................................................................................................... 123
9.9.3 ECP Mode Operation ......................................................................................................... 124
9.10 Keyboard Controller (KBC) ............................................................................................................. 130
9.10.1 Host Interface ..................................................................................................................... 131
9.10.2 Data Registers and Status Register................................................................................... 131
9.10.3 Keyboard and Mouse Interface .......................................................................................... 132
9.10.4 KIRQ and MIRQ ................................................................................................................. 132
9.11 Consumer Remote Control (TV Remote) IR (CIR) ......................................................................... 133
9.11.1 Overview............................................................................................................................. 133
9.11.2 Features ............................................................................................................................. 133
9.11.3 Block Diagram .................................................................................................................... 133
9.11.4 Transmit Operation............................................................................................................. 134
9.11.5 Receive Operation.............................................................................................................. 134
9.11.6 Register Descriptions and Address.................................................................................... 134
9.11.6.1 CIR Data Register (DR)......................................................................................... 135
9.11.6.2 CIR Interrupt Enable Register (IER)...................................................................... 135
9.11.6.3 CIR Receiver Control Register (RCR)................................................................... 136
9.11.6.4 CIR Transmitter Control Register 1 (TCR1) .......................................................... 137
9.11.6.5 CIR Transmitter Control Register (TCR2) ............................................................. 138
9.11.6.6 CIR Baud Rate Divisor Low Byte Register (BDLR)............................................... 141
9.11.6.7 CIR Baud Rate Divisor High Byte Register (BDHR) ............................................. 141
9.11.6.8 CIR Transmitter Status Register (TSR)................................................................. 141
9.11.6.9 CIR Receiver FIFO Status Register (RSR) ........................................................... 142
9.11.6.10 CIR Interrupt Identification Register (IIR) .............................................................. 142
9.12 Game Port Interface........................................................................................................................ 143
9.12.1 Game Port (Base+0h) ........................................................................................................ 143
9.13 MIDI Interface.................................................................................................................................. 143
9.13.1 MPU-401 Register Interface............................................................................................... 143
9.13.2 Operation............................................................................................................................ 144
10. DC Electrical Characteristics ..................................................................................................................... 145
11. AC Characteristics (VCC = 5V ± 5%, Ta = 0°C to + 70°C) ....................................................................... 147
11.1 Clock Input Timings ........................................................................................................................ 147
11.2 LCLK (PCICLK) and LRESET Timings........................................................................................... 147
11.3 LPC and SERIRQ Timings.............................................................................................................. 148
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vi
IT8702F V0.5
Contents
11.4 Serial Port, ASKIR, SIR and Consumer Remote Control Timings ................................................. 149
11.5 Modem Control Timings.................................................................................................................. 149
11.6 Floppy Disk Drive Timings .............................................................................................................. 150
11.7 EPP Address or Data Write Cycle Timings..................................................................................... 151
11.8 EPP Address or Data Read Cycle Timings .................................................................................... 152
11.9 ECP Parallel Port Forward Timings ................................................................................................ 152
11.10
ECP Parallel Port Backward Timings................................................................................. 153
11.11
RSMRST#, PWROK1/2, and ACPI Power Control Signals Timings ................................. 153
12. Package Information .................................................................................................................................. 155
13. Ordering Information .................................................................................................................................. 157
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vii
IT8702F V0.5
IT8702F
FIGURES
Figure 7-1. IT8702F Special Applications Circuitry for Intel ICH ...................................................................... 23
Figure 9-1. Start Frame Timing ......................................................................................................................... 66
Figure 9-2. Stop Frame Timing ......................................................................................................................... 66
Figure 9-3. General Logic of GPIO Function .................................................................................................... 69
Figure 9-4. Smart Card Reader Application.................................................................................................... 116
Figure 9-5. 9600 Baud Rate Example............................................................................................................. 117
Figure 9-6. Waveform Example of IFD............................................................................................................ 118
Figure 9-7. Keyboard and Mouse Interface .................................................................................................... 130
Figure 9-8. CIR Block Diagram ....................................................................................................................... 133
Figure 11-1. Clock Input Timings .................................................................................................................... 147
Figure 11-2. LCLK (PCICLK) and LRESET Timings....................................................................................... 147
Figure 11-3. LPC and SERIRQ Timings ......................................................................................................... 148
Figure 11-4. Serial Port, ASKIR, SIR and Consumer Remote Control Timings ............................................. 149
Figure 11-5. Modem Control Timings ............................................................................................................. 149
Figure 11-6. Floppy Disk Drive Timings.......................................................................................................... 150
Figure 11-7. EPP Address or Data Write Cycle Timings ................................................................................ 151
Figure 11-8. EPP Address or Data Read Cycle Timings ................................................................................ 152
Figure 11-9. ECP Parallel Port Forward Timings............................................................................................ 152
Figure 11-10. ECP Parallel Port Backward Timings ....................................................................................... 153
TABLES
Table 4-1. Pins Listed in Numeric Order............................................................................................................. 8
Table 5-1. Pin Description of Supplies Signals ................................................................................................... 9
Table 5-2. Pin Description of LPC Bus Interface Signals ................................................................................... 9
Table 5-3. Pin Description of MIDI Interface Signals ........................................................................................ 10
Table 5-4. Pin Description of Game Port Signals ............................................................................................. 10
Table 5-5. Pin Description of Fan Controller Signals ........................................................................................ 11
Table 5-6. Pin Description of Infrared Port Signals........................................................................................... 13
Table 5-7. Pin Description of Serial Port 1 Signals ........................................................................................... 13
Table 5-8. Pin Description of Serial Port 2 Signals ........................................................................................... 14
Table 5-9. Pin Description of Parallel Port Signals ........................................................................................... 15
Table 5-10. Pin Description of Floppy Disk Controller Signals ......................................................................... 16
Table 5-11. Pin Description of Smart Card Reader Interface Signals .............................................................. 16
Table 5-12. Pin Description of Keyboard Controller Signals............................................................................. 18
Table 5-13. Pin Description of Miscellaneous Signals...................................................................................... 18
Table 6-1. General Purpose I/O Group 1 (Set 1) .............................................................................................. 21
Table 6-2. General Purpose I/O Group 2 (Set 2) .............................................................................................. 21
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viii
IT8702F V0.5
Contents
Table 6-3. General Purpose I/O Group 3 (Set 3) .............................................................................................. 21
Table 6-4. General Purpose I/O Group 4 (Set 4) .............................................................................................. 22
Table 6-5. General Purpose I/O Group 5 (Set 5) .............................................................................................. 22
Table 7-1. Power On Strapping Options ........................................................................................................... 23
Table 8-1. Global Configuration Registers........................................................................................................ 27
Table 8-2. FDC Configuration Registers........................................................................................................... 27
Table 8-3. Serial Port 1 Configuration Registers .............................................................................................. 27
Table 8-4. Serial Port 2 Configuration Registers .............................................................................................. 28
Table 8-5. Parallel Port Configuration Registers............................................................................................... 28
Table 8-6. FAN Controller Configuration Registers .......................................................................................... 28
Table 8-7. KBC(Keyboard) Configuration Registers......................................................................................... 29
Table 8-8. KBC(Mouse) Configuration Registers ............................................................................................. 29
Table 8-9. GPIO Configuration Registers ......................................................................................................... 30
Table 8-10. GPIO Configuration Registers ....................................................................................................... 31
Table 8-11. MIDI Port Configuration Registers ................................................................................................. 32
Table 8-12. Game Port Configuration Registers............................................................................................... 32
Table 8-13. Consumer IR Configuration Registers........................................................................................... 32
Table 8-14. Base Address of Logical Devices .................................................................................................. 32
Table 9-1. Address Map on the LPC Bus ......................................................................................................... 71
Table 9-2. FAN Controller Registers ................................................................................................................. 72
Table 9-3. Digital Output Register (DOR) ......................................................................................................... 80
Table 9-4. Tape Drive Register (TDR) .............................................................................................................. 80
Table 9-5. Main Status Register (MSR) ............................................................................................................ 81
Table 9-6. Data Rate Select Register (DSR) .................................................................................................... 81
Table 9-7. Data Register (FIFO) ....................................................................................................................... 82
Table 9-8. Digital Input Register (DIR) .............................................................................................................. 82
Table 9-9. Diskette Control Register (DCR)...................................................................................................... 83
Table 9-10. Status Register 0 (ST0) ................................................................................................................. 84
Table 9-11. Status Register 1 (ST1) ................................................................................................................. 84
Table 9-12. Status Register 2 (ST2) ................................................................................................................. 85
Table 9-13. Status Register 3 (ST3) ................................................................................................................. 85
Table 9-14. Command Set Symbol Descriptions .............................................................................................. 86
Table 9-15. Command Set Summary................................................................................................................ 88
Table 9-16. Effects of MT and N Bits ................................................................................................................ 96
Table 9-17. SCAN Command Result ................................................................................................................ 98
Table 9-18. VERIFY Command Result ............................................................................................................. 99
Table 9-19. Interrupt Identification .................................................................................................................. 102
Table 9-20. HUT Values.................................................................................................................................. 102
Table 9-21. SRT Values .................................................................................................................................. 102
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ix
IT8702F V0.5
IT8702F
Table 9-22. HLT Values .................................................................................................................................. 103
Table 9-23. Effects of GAP and WG on FORMAT A TRACK and WRITE DATA Commands ....................... 103
Table 9-24. Effects of Drive Mode and Data Rate on FORMAT A TRACK and WRITE DATA Commands .. 103
Table 9-25. Serial Channel Registers ............................................................................................................. 105
Table 9-26. Interrupt Enable Register Description.......................................................................................... 106
Table 9-27. Interrupt Identification Register.................................................................................................... 107
Table 9-28. FIFO Control Register Description............................................................................................... 108
Table 9-29. Receiver FIFO Trigger Level Encoding ....................................................................................... 108
Table 9-30. Baud Rates Using (24 MHz ÷ 13) Clock...................................................................................... 109
Table 9-31. Line Control Register Description ................................................................................................ 110
Table 9-32. Stop Bits Number Encoding......................................................................................................... 110
Table 9-33. Modem Control Register Description........................................................................................... 111
Table 9-34. Line Status Register Description ................................................................................................. 111
Table 9-35. Modem Status Register Description ............................................................................................ 112
Table 9-36. Reset Control of Registers and Pinout Signals ........................................................................... 113
Table 9-37. SCRCLK Selections..................................................................................................................... 117
Table 9-38. Parallel Port Connector in Different Modes ................................................................................. 121
Table 9-39. Address Map and Bit Map for SPP and EPP Modes................................................................... 121
Table 9-40. Bit Map of the ECP Registers ...................................................................................................... 124
Table 9-41. ECP Register Definitions ............................................................................................................. 124
Table 9-42. ECP Mode Descriptions............................................................................................................... 125
Table 9-43. ECP Pin Descriptions................................................................................................................... 125
Table 9-44. Extended Control Register (ECR) Mode and Description ........................................................... 127
Table 9-45. Data Register READ/WRITE Controls......................................................................................... 131
Table 9-46. Status Register ............................................................................................................................ 131
Table 9-47. List of CIR Registers .................................................................................................................... 134
Table 9-48. Modulation Carrier Frequency ..................................................................................................... 139
Table 9-49. Receiver Demodulation Low Frequency (HCFS = 0) .................................................................. 140
Table 9-50. Receiver Demodulation High Frequency (HCFS = 1) ................................................................. 141
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x
IT8702F V0.5
Features
1. Features
Low Pin Count Interface
Comply with Intel Low Pin Count Interface
Specification Rev. 1.0
− Supports LDRQ#, SERIRQ protocols
− Supports PCI PME# Interfaces
−
IEEE 1284 Parallel Port
Standard mode -- Bi-directional SPP compliant
− Enhanced mode -- EPP V. 1.7 and V. 1.9
compliant
− High speed mode -- ECP, IEEE 1284 compliant
− Back-drive current reduction
− Printer power-on damage reduction
− Supports POST (Power-On Self Test) Data
Port
−
ACPI & LANDesk Compliant
ACPI V. 1.0 compliant
− Register sets compatible with “Plug and Play
ISA Specification V. 1.0a”
− LANDesk 3.X compliant
− Supports 12 logical devices
−
Floppy Disk Controller
Supports two 360K/ 720K/ 1.2M/ 1.44M/ 2.88M
floppy disk drives
− Enhanced digital data separator
− 3-Mode drives supported
− Supports automatic write protection via
software
−
EC Controller
1 chassis open detection input with low power
Flip-Flop backed by the battery
− Watch Dog comparison of all monitored values
− Provides VID0 – VID5 support for the CPU
−
Fan Speed Controller
Provides fan on-off and PWM control
− Supports 5 programmable Pulse Width
Modulation (PWM) outputs
− 128 steps of PWM modes
− Monitors 5 fan tachometer inputs
Keyboard Controller
8042 compatible for PS/2 keyboard and mouse
− 2KB of custom ROM and 256-byte data RAM
− GateA20 and Keyboard reset output
− Supports any key, or 2-5 sequential keys, or 13 simultaneous keys keyboard power-on
events
− Supports mouse double-click and/or mouse
move power on events
− Supports Keyboard and Mouse I/F hardware
auto-swap
−
−
Two 16C550 UARTs
Supports two standard Serial Ports
− Supports IrDA 1.0/ASKIR protocols
− Supports Smart Card Reader protocols
−
Smart Card Reader
Compliant with Personal Computer Smart Card
(PC/SC) Working Group standard
− Compliant with smart card (ISO 7816)
protocols
− Supports card present detect
− Supports Smart Card insertion power-on
feature
− Supports one programmable clock frequency,
and 7.1 MHz and 3.5 MHz (Default) card
clocks
−
Consumer Remote Control (TV remote) IR
with power-up feature
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Specifications subject to Change without Notice
1
IT8702F V0.5
ITPM-PN-200420
By Joseph, 6/8/2004
IT8702F
Game Port
Built-in 558 quad timers and buffer chips
− Supports direct connection of two joysticks
ITE innovative automatic power-failure
resume and power button de-bounce
−
Dedicated Infrared pins
Dedicated MIDI Interface
− MPU-401 UART mode compatible
VCCH and Vbat Supported
38 General Purpose I/O Pins
Input mode supports either switch de-bounce
or programmable external IRQ input routing
− Output mode supports 2 sets of programmable
LED blinking periods
Built-in 32.768 KHz Oscillator
External IRQ Input Routing Capability
Provides IRQ input routing through GPIO input
mode
− Programmable registers for IRQ routing
128-pin QFP
−
Single 24/48 MHz Clock Input
+5V Power Supply
−
Watch Dog Timer
Time resolution 1 minute or 1 second,
maximum 255 minutes or 255 seconds
− Output to KRST# when expired
−
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2
IT8702F V0.5
General Description
2. General Description
The IT8702F is a Low Pin Count Interface-based highly integrated Super I/O. The IT8702F provides the most
commonly used legacy Super I/O functionality plus the Fan Speed Controller and Smart Card Reader
Interface. The device’s LPC interface complies with Intel “LPC Interface Specification Rev. 1.0”. The IT8702F
is ACPI & LANDesk compliant.
The IT8702F features a PC/SC and ISO 7816 compliant Smart Card Reader. The IT8702F contains one
game port which supports 2 joysticks, 1 MIDI port, and 1 Fan Speed Controller. The fan speed controller is
responsible to control 5 fan speeds through three 128 steps of Pulse Width Modulation (PWM) output pins
and to monitor five FANs’ Tachometer inputs. It also features two 16C550 UARTs, one IEEE 1284 Parallel
Port, one Floppy Disk Controller and one 8042 Keyboard Controller.
The IT8702F has integrated 12 logical devices. One high-performance 2.88MB floppy disk controller, with
digital data separator, supports two 360K/ 720K/ 1.2M/ 1.44M/ 2.88M floppy disk drives. One multi-mode
high-performance parallel port features the bi-directional Standard Parallel Port (SPP), the Enhanced Parallel
Port (EPP V. 1.7 and EPP V. 1.9 are supported), and the IEEE 1284 compliant Extended Capabilities Port
(ECP). Two 16C550 standard compatible enhanced UARTs perform asynchronous communication, and also
support either IR or MIDI interfaces. One game port with built-in 558 quad timers and buffer chips supports
direct connection of 2 joysticks. The device also features one MPU-401 UART mode compatible MIDI port,
one fan speed controller responsible for controlling / monitoring 5 fans and 5 GPIO ports (38 GPIO pins). The
IT8702F also has an integrated 8042 compatible Keyboard Controller with 2KB of programmable ROM for
customer application.
These 12 logical devices can be individually enabled or disabled via software configuration registers. The
IT8702F utilizes power-saving circuitry to reduce power consumption, and once a logical device is disabled
the inputs are gated inhibit, the outputs are tri-state, and the input clock is disabled. The device requires a
single 24/48 MHz clock input and operates with +5V power supply. The IT8702F is available in 128-pin QFP
(Quad Flat Package).
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3
IT8702F V0.5
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4
IT8702F V0.5
Block Diagram
Serial Port I/F
IR I/F
SCR I/F
Serial Port I/F
Parallel Port
I/F
Floppy
Drive I/F
Clock
Gen.
LDRQ#
CLKRUN#
LPC Interface
& Plug-and-Play
Registers
PME#
Keyboard
Controller
MPU-401
UART
mode
16C550
UART 1
IrDA 1.0 /
ASKIR
Central Interface Bus
24 / 48 MHz
OSC.
LPC I/F
SERIRQ
3. Block Diagram
Smart Card
Reader
16C550
UART 2
IEEE1284
Parallel
Port
Consumer
I/R
Game
Port
General
Purpose
I/O
Fan
Speed
Controller
Floppy
Disk
Controller
Mouse I/F
Keyboard I/F
MIDI I/F
CIR I/F
Joystick I/F
I/O Ports
Fan I/F
FAN Controller
Fan
Tachometers
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5
IT8702F V0.5
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6
IT8702F V0.5
Pin Configuration
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
CTS2#
RI2#
DCD2#
SIN1
SOUT1/JP3
DSR1#
RTS1#/JP2
DTR1#/JP1
CTS1#
RI1#
DCD1#
GNDD
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
STB#
AFD#
ERR#
INIT#
SLIN#
ACK#
4. Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
IT8702F
128-QFP
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
BUSY
PE
SLCT
VCC
NC
NC
NC
ATXPG
NC
NC
NC
PCIRSTIN#
NC
NC
NC
NC
GNDA
RSMRST#/CIRRX/GP55
PCIRST4#/SCRPSNT#/GP10
MCLK
MDAT
KCLK
KDAT
GP40
PWROK2/GP41
GP53
PSON#/GP42
PANSWH#/GP43
GNDD
PME#/GP54
PWRON#/GP44
PSIN/GP45
IRRX/GP46
VBAT
COPEN#
VCCH
IRTX/GP47
DSKCHG#
DIR#
STEP#
HDSEL#
WGATE#
RDATA#
TRK0#
INDEX#
WPT#
DRVA#
DRVB#
WDATA#
GNDD
DENSEL#
MTRA#
MTRB#
LAD2
LAD3
KRST#
GA20
PCICLK
PCIRST5#/CLKRUN#/GP50
CLKIN
SERIRQ
LFRAME#
LAD0
LAD1
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
DTR2#/JP4
RTS2/JP5
DSR2#
VCC
SOUT2/JP6
SIN2
FAN_TAC1
FAN_CTL1
FAN_TAC2/GP52
FAN_CTL2/GP51
FAN_TAC3/GP37
FAN_CTL3/GP36
VID5/GP35
VID4/GP34
GNDD
VID3/GP33
VID2/GP32
VID1/GP31
VID0/GP30
FAN_CTL4/JSBB2/GP27
FAN_CTL5/JSBB1/GP26
FAN_TAC4/JSBCY/GP25
FAN_TAC5/JSBCX/GP24
JSAB2/GP23
JSAB1/GP22
JSACY/GP21
JSACX/GP20
MIDI_OUT/GP17
MIDI_IN/GP16
RESETCON#/CIRTX/GP15
PCIRST1#/SCRRST/GP14
PWROK1/SCRPFET#/GP13
PCIRST2#/SCRIO/GP12
PCIRST3#/SCRCLK/GP11
VCC
VIDVCC
LRESET#
LDRQ#
Top View
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7
IT8702F V0.5
IT8702F
Table 4-1. Pins Listed in Numeric Order
Pin
1
DTR2#/JP4
33
2
RTS2#/JP5
34
3
4
5
6
7
8
9
10
11
12
13
14
15
DSR2#
VCC
SOUT2/JP6
SIN2
FAN_TAC1
FAN_CTL1
FAN_TAC2/GP52
FAN_CTL2/GP51
FAN_TAC3/GP37
FAN_CTL3/GP36
VID5/GP35
VID4/GP34
GNDD
35
36
37
38
39
40
41
42
43
44
45
46
47
16
VID3/GP33
48
17
18
19
VID2/GP32
VID1/GP31
VID0/GP30
49
50
51
Signal
PCIRST2#/SCRIO
/GP12
PCIRST3#/SCRC
LK/GP11
VCC
VIDVCC
LRESET#
LDRQ#
SERIRQ
LFRAME#
LAD0
LAD1
LAD2
LAD3
KRST#
GA20
PCICLK
PCIRST5#/CLKR
UN#/GP50
CLKIN
GNDD
DENSEL#
20
FAN_CTL4/JSBB
2/GP27
52
MTRA#
21
22
23
24
25
26
27
28
29
30
31
32
Signal
FAN_CTL5/JSBB
1/GP26
FAN_TAC4/JSBC
Y/GP25
FAN_TAC5/JSBC
X/GP24
JSAB2/GP23
JSAB1/GP22
JSACY/GP21
JSACX/GP20
MIDI_OUT/GP17
MIDI_IN/GP16
RESETCON#/CIR
TX/GP15
PCIRST1#/SCRR
ST/GP14
PWROK1/SCRPF
ET#/GP13
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Pin
Pin
Signal
Pin
Signal
65
DSKCHG#
97
NC
66
IRTX/GP47
98
NC
67
68
69
70
71
72
73
74
75
76
77
78
79
VCCH
COPEN#
VBAT
IRRX/GP46
GP45
PWRON#/GP44
PME#/GP54
GNDD
PANSWH#/GP43
PSON#/GP42
GP53
PWROK2/GP41
GP40
99
100
101
102
103
104
105
106
107
108
109
110
111
VCC
SLCT
PE
BUSY
ACK#
SLIN#
INIT#
ERR#
AFD#
STB#
PD0
PD1
PD2
80
KDAT
112
PD3
81
82
83
KCLK
MDAT
MCLK
PCIRST4#/
113
114
115
PD4
PD5
PD6
84
SCRPSNT#/GP1
116
PD7
117
GNDD
0
RSMRST#/CIRRX
/GP55
53
MTRB#
85
54
DRVA#
86
GNDA
118
DCD1#
55
DRVB#
87
NC
119
RI1#
56
57
58
59
60
61
WDATA#
DIR#
STEP#
HDSEL#
WGATE#
RDATA#
88
89
90
91
92
93
NC
NC
NC
PCIRSTIN#
NC
NC
120
121
122
123
124
125
CTS1#
DTR1#/JP1
RTS1#/JP2
DSR1#
SOUT1/JP3
SIN1
62
TRK0#
94
NC
126
DCD2#
63
INDEX#
95
ATXPG
127
RI2#
64
WPT#
96
NC
128
CTS2#
8
IT8702F V0.5
Pin Descriptions
5. IT8702F Pin Descriptions
Table 5-1. Pin Description of Supplies Signals
Pin(s) No.
4, 35, 99
67
69
36
15, 50,
74, 117
86
Symbol
VCC
VCCH
VBAT
VIDVCC
GNDD
Attribute
PWR
PWR
PWR
PWR
GND
Power
-
GNDA
GND
-
Pin(s) No.
37
38
Symbol
LRESET#
LDRQ#
Attribute
DI
DO16
Power
VCC
VCC
39
40
SERIRQ
LFRAME#
DIO16
DI
VCC
VCC
41 – 44
LAD[0:3]
DIO16
VCC
47
PCICLK
DI
VCC
48
PCIRST5#/CLK
RUN#/GP50
DO16/DIO
D16/
DIOD16
VCC
PME#/GP54
DOD8/
DIOD8
VCCH
Description
+5V Power Supply.
+5V VCC Help Supply.
+3.3V Battery Supply.
VID power supply. (1.2 or 3.3V)
Digital Ground.
Analog Ground.
Table 5-2. Pin Description of LPC Bus Interface Signals
73
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Description
LPC RESET #.
LPC DMA Request #.
An encoded signal for DMA channel select.
Serial IRQ.
LPC Frame #.
This signal indicates the start of LPC cycle.
LPC Address/Data 0 - 3.
4-bit LPC address/bi-directional data lines. LAD0 is the LSB
and LAD3 is the MSB.
PCI Clock.
33 MHz PCI clock input for LPC I/F and SERIRQ.
PCI Reset 5 # / Clock Run # / General Purpose I/O 50.
• The first function of this pin is PCI Reset 5 #. It is a
buffer output of LRESET# if bit1 of Index 2Ch is 0. It
will be (LRESET# AND PCIRSTIN#) if bit1 of Index
2Ch is 1.
• The second function of this pin is the clock run #.
This is an open-drain output and also an input. The
IT8702F uses this signal to request starting (or
speed up) the clock. CLKRUN# also indicates the
clock status.
• The third function of this pin is the General Purpose
I/O 50.
• The function configuration of this pin is decided by
the software configuration registers.
Power Management Event # / General Purpose I/O 54.
• The first function of this pin is the power
management event #. It supports the PCI PME#
interface. This signal allows the peripheral to request
the system to wake up from the D3 (cold) state.
• The second function of this pin is the General
Purpose I/O Port 5 Bit 4.
• The function configuration of this pin is determined
by programming the software configuration registers.
9
IT8702F V0.5
IT8702F
Table 5-3. Pin Description of MIDI Interface Signals
Pin(s) No.
Symbol
Attribute
Power
28
MIDI_OUT/
GP17
DO8/
DIOD8
VCC
MIDI_IN/
GP16
DI/
DIOD8
VCC
29
Description
MIDI Output / General Purpose I/O 17.
• The first function of this pin is MIDI Output.
• The second function of this pin is the General
Purpose I/O Port 1 Bit 7.
• The function configuration of this pin is determined by
programming the software configuration registers.
MIDI Input / General Purpose I/O 16.
• The first function of this pin is MIDI Input.
• The second function of this pin is the General
Purpose I/O Port 1 Bit 6.
• The function configuration of this pin is determined by
programming the software configuration registers.
Table 5-4. Pin Description of Game Port Signals
Pin(s) No.
27
Symbol
JSACX/
GP20
Attribute
DIOD8/
DIOD8
Power
VCC
JSACY/
GP21
DIOD8/
DIOD8
VCC
JSAB1/
GP22
DI/
DIOD8
VCC
JSAB2/
GP23
DI/
DIOD8
VCC
FAN_TAC5/
JSBCX/
GP24
DI/
DIOD8/
DIOD8
VCC
26
25
24
23
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Description
Joystick A Coordinate X / General Purpose I/O 20.
• The first function of this pin is Joystick A Coordinate
X.
• The second function of this pin is the General
Purpose I/O Port 2 Bit 0.
• The function configuration of this pin is determined by
programming the software configuration registers.
Joystick A Coordinate Y / General Purpose I/O 21.
• The first function of this pin is Joystick A Coordinate
Y.
• The second function of this pin is the General
Purpose I/O Port 2 Bit 1.
• The function configuration of this pin is determined by
programming the software configuration registers.
Joystick A Button 1 / General Purpose I/O 22.
• The first function of this pin is Joystick A Button 1.
• The second function of this pin is the General
Purpose I/O Port 2 Bit 2.
• The function configuration of this pin is determined by
programming the software configuration registers.
Joystick A Button 2 / General Purpose I/O 23.
• The first function of this pin is Joystick A Button 2.
• The second function of this pin is the General
Purpose I/O Port 2 Bit 3.
• The function configuration of this pin is determined by
programming the software configuration registers.
Joystick B Coordinate X / General Purpose I/O 24.
• The first function of this pin is Fan Tachometer Input
5. 0 to +5V amplitude fan tachometer input.
• The second function of this pin is Joystick B
Coordinate X.
• The third function of this pin is the General Purpose
I/O Port 2 Bit 4.
• The function configuration of this pin is determined by
programming the software configuration registers.
10
IT8702F V0.5
Pin Descriptions
Pin(s) No.
22
21
20
Symbol
FAN_TAC4/
JSBCY/
GP25
Attribute
DI/
DIOD8/
DIOD8
Power
VCC
FAN_CTL5/
JSBB1/
GP26
DOD8
DI/
DIOD8
VCC
FAN_CTL4/
JSBB2/
GP27
DOD8/
DI/
DIOD8
VCC
Description
Joystick B Coordinate Y / General Purpose I/O 25.
• The first function of this pin is Fan Tachometer Input
4. 0 to +5V amplitude fan tachometer input.
• The second function of this pin is Joystick B
Coordinate Y.
• The third function of this pin is the General Purpose
I/O Port 2 Bit 5.
• The function configuration of this pin is determined by
programming the software configuration registers.
Joystick B Button 1 / General Purpose I/O 26.
• The first function of this pin is Fan Control Output 5.
(PWM output signal to Fan’s FET.)
• The second function of this pin is Joystick B Button 1.
• The third function of this pin is the General Purpose
I/O Port 2 Bit 6.
• The function configuration of this pin is determined by
programming the software configuration registers.
Joystick B Button 2 / General Purpose I/O 27.
• The first function of this pin is Fan Control Output 4.
(PWM output signal to Fan’s FET.)
• The second function of this pin is Joystick B Button 2.
• The third function of this pin is the General Purpose
I/O Port 2 Bit 7.
• The function configuration of this pin is determined by
programming the software configuration registers.
Table 5-5. Pin Description of Fan Controller Signals
Pin(s) No.
8
Symbol
FAN_CTL1
Attribute
DOD8
Power
VCC
10
FAN_CTL2/
GP51
DOD8/
DIOD8
VCC
FAN_CTL3/
GP36
DOD8/
DIOD8
VCC
7
FAN_TAC1
DI
VCC
9
FAN_TAC2/
GP52
DI/
DIOD8
VCC
12
www.ite.com.tw
Description
Fan Control Output 1.
(PWM output signal to Fan’s FET.)
Fan Control Output 2 / General Purpose I/O 51.
• The first function of this pin is Fan Control Output 2.
(PWM output signal to Fan’s FET.)
• The second function of this pin is the General
Purpose I/O Port 5 Bit 1.
• The function configuration of this pin is determined by
programming the software configuration registers.
Fan Control Output 3 / General Purpose I/O 36.
• The first function of this pin is Fan Control Output 3.
(PWM output signal to Fan’s FET.)
• The second function of this pin is the General
Purpose I/O Port 3 Bit 6.
• The function configuration of this pin is determined by
programming the software configuration registers.
Fan Tachometer Input 1.
0 to +5V amplitude fan tachometer input.
Fan Tachometer Input 2 / General Purpose I/O 52.
• The first function of this pin is Fan Tachometer Input
2. 0 to +5V amplitude fan tachometer input.
• The second function of this pin is the General
Purpose I/O Port 5 Bit 2.
• The function configuration of this pin is determined by
programming the software configuration registers.
11
IT8702F V0.5
IT8702F
Pin(s) No.
11
Symbol
FAN_TAC3/
GP37
www.ite.com.tw
Attribute
DI/
DIOD8
Power
VCC
Description
Fan Tachometer Input 3 / General Purpose I/O 37.
• The first function of this pin is Fan Tachometer Input
3. 0 to +5V amplitude fan tachometer input.
• The second function of this pin is the General
Purpose I/O Port 5 Bit 2.
• The function configuration of this pin is determined by
programming the software configuration registers.
12
IT8702F V0.5
Pin Descriptions
Table 5-6. Pin Description of Infrared Port Signals
Pin(s) No.
30
85
Symbol
RESETCON#/
CIRTX/
GP15
Attribute
DI/
DOD8/
DIOD8
Power
VCC
RSMRST#/
CIRRX/
GP55
DOD8/
DI/
DIOD8
VCCH
IRRX/
GP46
DI/
DIOD8
VCCH
IRTX/
GP47
DO8/
DIOD8
VCC
70
66
Description
Reset Connect # / Consumer Infrared Transmit Output /
General Purpose I/O 15.
• The first function of this pin is Reset Connect #. It
connects to reset button, and also other reset source
on the motherboard.
• The second function of this pin is Consumer Infrared
Transmit Output.
• The Third function of this pin is the General Purpose
I/O Port 1 Bit 5.
• The function configuration of this pin is determined by
programming the software configuration registers.
Resume Reset # / Consumer Infrared Receive Input /
General Purpose I/O 55.
• The first function of this pin is Resume Reset #. It is
power good signal of VCCH. The high threshold is
4V ± 0.2V, and the low threshold is 3.5V ± 0.2V
• The second function of this pin is Consumer Infrared
Receive Input.
• The Third function of this pin is the General Purpose
I/O Port 5 Bit 5.
• The function configuration of this pin is determined by
programming the software configuration registers.
Infrared Receive Input / General Purpose I/O 46.
• The first function of this pin is Infrared Receive Input.
• The second function of this pin is the General
Purpose I/O Port 4 Bit 6.
• The function configuration of this pin is determined by
programming the software configuration registers.
Infrared Transmit Output / General Purpose I/O 47.
• The first function of this pin is Infrared Transmit
output.
• The second function of this pin is the General
Purpose I/O Port 4 Bit 7.
• The function configuration of this pin is determined by
programming the software configuration registers.
Table 5-7. Pin Description of Serial Port 1 Signals
Pin(s) No.
125
Symbol
SIN1
Attribute
DI
Power
VCC
124
SOUT1/
JP3
DO8/
DI
VCC
123
DSR1#
DI
VCC
122
RTS1#/
DO8/
VCC
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Description
Serial Data Input 1.
This input receives serial data from the communications link.
Serial Data Output 1.
This output sends serial data to the communications link. This
signal is set to a marking state (logic 1) after a Master Reset
operation or when the device is in one of the Infrared
communications modes.
During LRESET#, this pin is input for JP3 power-on strapping
option
Data Set Ready 1 #.
When the signal is low, it indicates that the MODEM or data
set is ready to establish a communications link. The DSR#
signal is a MODEM status input whose condition can be
tested by reading the MSR register.
Request to Send 1 #.
13
IT8702F V0.5
IT8702F
Pin(s) No.
Symbol
JP2
Attribute
DI
Power
121
DTR1#/
JP1
DO8/
DI
VCC
120
CTS1#
DI
VCC
119
RI1#
DI
VCC
118
DCD1#
DI
VCC
Pin(s) No.
6
Symbol
SIN2
Attribute
DI
Power
VCC
5
SOUT2/JP6
DO8/DI
VCC
3
DSR2#
DI
VCC
2
RTS2#/JP5
DO8/DI
VCC
1
DTR2#/
JP4
DO8/DI
VCC
Description
When this signal is low, this output indicates to the MODEM
or data set that the device is ready to send data. RTS# is
activated by setting the appropriate bit in the MCR register to
1. After a Master Reset operation or during Loop mode, RTS#
is set to its inactive state.
During LRESET#, this pin is input for JP2 power-on strapping
option
Data Terminal Ready 1 #.
DTR# is used to indicate to the MODEM or data set that the
device is ready to exchange data. DTR# is activated by
setting the appropriate bit in the MCR register to 1. After a
Master Reset operation or during Loop mode, DTR# is set to
its inactive state.
During LRESET#, this pin is input for JP1 power-on strapping
option
Clear to Send 1 #.
When the signal is low, it indicates that the MODEM or data
set is ready to accept data. The CTS# signal is a MODEM
status input whose condition can be tested by reading the
MSR register.
Ring Indicator 1 #.
When the signal is low, it indicates that a telephone ring
signal has been received by the MODEM. The RI# signal is a
MODEM status input whose condition can be tested by
reading the MSR register.
Data Carrier Detect 1 #.
When the signal is low, it indicates that the MODEM or data
set has detected a carrier. The DCD# signal is a MODEM
status input whose condition can be tested by reading the
MSR register.
Table 5-8. Pin Description of Serial Port 2 Signals
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Description
Serial Data In 2.
This input receives serial data from the communications link.
Serial Data Out 2.
This output sends serial data to the communications link. This
signal is set to a marking state (logic 1) after a Master Reset
operation or when the device is in one of the Infrared
communications modes. During LRESET#, this pin is input for
JP6 power-on strapping option
Data Set Ready 2 #.
When low, indicates that the MODEM or data set is ready to
establish a communications link. The DSR# signal is a
MODEM status input whose condition can be tested by
reading the MSR register.
Request to Send 2 #.
When low, this output indicates to the MODEM or data set
that the device is ready to send data. RTS# is activated by
setting the appropriate bit in the MCR register to 1. After a
Master Reset operation or during Loop mode, RTS# is set to
its inactive state. During LRESET#, this pin is input for JP5
power-on strapping option
Data Terminal Ready 2 #.
DTR# is used to indicate to the MODEM or data set that the
device is ready to exchange data. DTR# is activated by
setting the appropriate bit in the MCR register to 1. After a
Master Reset operation or during Loop mode, DTR# is set to
its inactive state.
14
IT8702F V0.5
Pin Descriptions
Pin(s) No.
Symbol
Attribute
Power
128
CTS2#
DI
VCC
127
RI2#
DI
VCC
126
DCD2#
DI
VCC
Description
During LRESET#, this pin is input for JP4 power-on strapping
option
Clear to Send 2 #.
When low, indicates that the MODEM or data set is ready to
accept data. The CTS# signal is a MODEM status input
whose condition can be tested by reading the MSR register.
Ring Indicator 2 #.
When low, indicates that a telephone ring signal has been
received by the MODEM. The RI# signal is a MODEM status
input whose condition can be tested by reading the MSR
register.
Data Carrier Detect 2 #.
When low, indicates that the MODEM or data set has
detected a carrier. The DCD# signal is a MODEM status input
whose condition can be tested by reading the MSR register.
Table 5-9. Pin Description of Parallel Port Signals
Pin(s) No.
100
Symbol
SLCT
Attribute
DI
Power
VCC
101
PE
DI
VCC
102
BUSY
DI
VCC
103
ACK#
DI
VCC
104
SLIN#
DIO24
VCC
105
INIT#
DIO24
VCC
106
ERR#
DI
VCC
107
AFD#
DIO24
VCC
108
STB#
DI
VCC
109 – 116
PD[0:7]
DIO24
VCC
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Description
Printer Select.
This signal goes high when the line printer has been selected.
Printer Paper End.
This signal is set high by the printer when it runs out of paper.
Printer Busy.
This signal goes high when the line printer has a local
operation in progress and cannot accept data.
Printer Acknowledge #.
This signal goes low to indicate that the printer has already
received a character and is ready to accept another one.
Printer Select Input #.
When the signal is low, the printer is selected. This signal is
derived from the complement of bit 3 of the printer control
register.
Printer Initialize #.
When the signal is low, the printer is selected. This signal is
derived from the complement of bit 3 of the printer control
register.
Printer Error #.
When the signal is low, it indicates that the printer has
encountered an error. The error message can be read from
bit 3 of the printer status register.
Printer Auto Line Feed #.
When the signal is low, it is derived from the complement of
bit 1 of the printer control register and is used to advance one
line after each line is printed.
Printer Strobe #.
When the signal is low, it is the complement of bit 0 of the
printer control register and is used to strobe the printing data
into the printer.
Parallel Port Data [0:7].
This bus provides a byte-wide input or output to the system.
The eight lines are held in a high impedance state when the
port is deselected.
15
IT8702F V0.5
IT8702F
Table 5-10. Pin Description of Floppy Disk Controller Signals
Pin(s) No.
Symbol
Attribute
Power
51
DENSEL#
DO40
VCC
52
MTRA#
DO40
VCC
53
MTRB#
DO40
VCC
Description
FDD Density Select #.
DENSEL# is high for high data rates (500 Kbps, 1 Mbps).
DENSEL# is low for low data rates (250 Kbps, 300 Kbps).
FDD Motor A Enable #.
This signal is active low.
FDD Motor B Enable #.
• The function of this pin is FDD Motor B #. This signal
is active low.
54
DRVA#
DO40
VCC
55
DRVB#
DO40
VCC
56
WDATA#
DO40
VCC
57
DIR#
DO40
VCC
58
STEP#
DO40
VCC
59
HDSEL#
DO40
VCC
60
WGATE#
DO40
VCC
61
RDATA#
DI
VCC
62
TRK0#
DI
VCC
63
INDEX#
DI
VCC
64
WPT#
DI
VCC
65
DSKCHG#
DI
VCC
FDD Drive A Enable #.
This signal is active low.
FDD Drive B Enable #.
This signal is active low.
FDD Write Serial Data to the Drive #.
This signal is active low.
FDD Head Direction #.
Step in when this signal is low and step out when high during
a SEEK operation.
FDD Step Pulse #.
This signal is active low.
FDD Head Select #.
This signal is active low.
FDD Write Gage Enable #.
This signal is active low.
FDD Read Disk Data #.
This signal is active low. It is serial data input from FDD.
FDD Track 0 #.
This signal is active low. It indicates that the head of the
selected drive is on track 0.
FDD Index #.
This signal is active low. It indicates the beginning of a disk
track.
FDD Write Protect #.
This signal is active low. It indicates that the disk of the
selected drive is write-protected.
FDD Disk Change #.
This signal is active low. It senses whether the drive door has
been opened or a diskette has been changed.
Table 5-11. Pin Description of Smart Card Reader Interface Signals
Pin(s) No.
31
Symbol
PCIRST1#/
SCRRST/
GP14
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Attribute
DOD8Note1/
DOD8/
DIOD8
Power
VCC
Description
PCI Reset 1 # / Smart Card Reset / General Purpose I/O
13.
• The first function of this pin is PCI Reset 1 #. It is a
buffer of LRESET#.
• The second function of this pin is Smart Card Reset.
• The third function of this pin is the General Purpose
I/O Port 1 Bit 4.
• The function configuration of this pin is determined
by programming the software configuration registers.
16
IT8702F V0.5
Pin Descriptions
Pin(s) No.
32
33
34
84
Symbol
PWROK1/
SCRPFET#/
GP13
Attribute
DOD8/
DOD8/
DIOD8
Power
VCC
PCIRST2#/
SCRIO /
GP12
DOD8Note1/
DIOD8/
DIOD8
VCC
PCIRST3#/
SCRCLK /
GP11
DOD8Note1/
DOD8/
DIOD8
VCC
PCIRST4#/
DOD8Note1/
DI/
DIOD8
VCCH
SCRPSNT#/
GP10
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Description
Power OK 1 of VCC / Smart Card Power FET Control
Output # / General Purpose I/O 13.
• The first function of this pin is Power OK 1 of VCC.
• The second function of this pin is Smart Card Power
FET Control Output #. The Smart Card Reader
interface requires this pin to drive an external Power
FET to supply the current for the Smart Card.
• The third function of this pin is the General Purpose
I/O Port 1 Bit 3.
• The function configuration of this pin is determined
by programming the software configuration registers.
PCI Reset 2 # / Smart Card Serial Data I/O / General
Purpose I/O 12.
• The first function of this pin is PCI Reset 2 #. It is a
buffer of LRESET#.
• The second function of this pin is Smart Card Serial
Data I/O.
• The third function of this pin is the General Purpose
I/O Port 1 Bit 2.
• The function configuration of this pin is determined
by programming the software configuration registers.
PCI Reset 3 # / Smart Card Clock / General Purpose I/O
11.
• The first function of this pin is PCI Reset 3 #. It is a
buffer of LRESET#. It is a buffer output of LRESET#
if bit1 of Index 2Ch is 0. It will be (LRESET# AND
PCIRSTIN#) if bit1 of Index 2Ch is 1.
• The second function of this pin is Smart Card Clock.
Three different card clocks are selectable from this
pin: high speed (7.1 MHz), low speed (Default: 3.5
MHz) and a programmable card clock.
• The third function of this pin is the General Purpose
I/O Port 1 Bit 1.
• The function configuration of this pin is determined
by programming the software configuration registers.
PCI Reset 4 # / Smart Card Present Detect # / General
Purpose I/O 10.
• The first function of this pin is PCI Reset 4 #. It is a
buffer of LRESET#.
• The second function of this pin is Smart Card
Present Detect #. This pin provides the Smart Card
insertion detection for the Smart Card Reader
interface. Upon detecting the insertion of the Smart
Card, this pin will trigger the power-on event.
• The third function of this pin is the General Purpose
I/O Port 1 Bit 0.
• The function configuration of this pin is determined
by programming the software configuration registers.
17
IT8702F V0.5
IT8702F
Table 5-12. Pin Description of Keyboard Controller Signals
Pin(s) No.
80
81
82
83
45
46
Symbol
KDAT
KCLK
MDAT
MCLK
KRST#
GA20
Attribute
DIOD24
DIOD24
DIOD24
DIOD24
DO16
DO16
Power
VCCH
VCCH
VCCH
VCCH
VCC
VCC
Description
Keyboard Data.
Keyboard Clock.
PS/2 Mouse Data.
PS/2 Mouse Clock.
Keyboard Reset #.
Gate Address 20.
Table 5-13. Pin Description of Miscellaneous Signals
Pin(s) No.
49
72
75
Symbol
CLKIN
PWRON#/
GP44
Attribute
DI
DOD8/
DIOD8
Power
VCC
VCCH
PANSWH#/
GP43
DI/
DIOD8
VCCH
Description
24 or 48 MHz Clock Input.
Power On Request Output # / General Purpose I/O 34.
• The first function of this pin is Power On Request
Output #.
• The second function of this pin is the General
Purpose I/O Port 4 Bit 4.
• The function configuration of this pin is determined by
programming the software configuration registers.
Main Power Switch Button Input # / General Purpose I/O
43.
• The first function of this pin is Main Power Switch
Button Input #.
• The second function of this pin is the General
Purpose I/O Port 4 Bit 3.
• The function configuration of this pin is determined by
programming the software configuration registers.
76
71
77
PSON#/
GP42
DOD8/
DIOD8
VCCH
PSIN/
GP45
DI/
DIOD8
VCCH
GP53
DIOD8
VCCH
Power Supply On-Off Output # / General Purpose I/O 42.
• The first function of this pin is Power Supply On-Off
Control Output #.
• The second function of this pin is the General
Purpose I/O Port 4 Bit 2.
• The function configuration of this pin is determined by
programming the software configuration registers.
PSIN Input / General Purpose I/O 45.
• The first function of this pin is PSIN Input.
• The second function of this pin is the General
Purpose I/O Port 4 Bit 5.
• The function configuration of this pin is determined by
programming the software configuration registers.
General Purpose I/O 53.
• The first function of this pin is the General Purpose
I/O Port 5 Bit 3.
• The function configuration of this pin is determined by
programming the software configuration registers.
78
PWROK2/
GP41
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DOD8/
DIOD8
VCCH
Power OK 2 of VCC / General Purpose I/O 41.
• The first function of this pin is Power OK 2 of VCC.
• The second function of this pin is the General
Purpose I/O Port 4 Bit 1.
• The function configuration of this pin is determined by
programming the software configuration registers.
18
IT8702F V0.5
Pin Descriptions
Pin(s) No.
79
Symbol
GP40
Attribute
DIOD8
Power
VCCH
Description
General Purpose I/O 40.
• The first function of this pin is the General Purpose
I/O Port 4 Bit 0.
• The function configuration of this pin is determined by
programming the software configuration registers.
95
ATXPG
DI
VCC
ATX Power Good.
• ATX Power Good. PWROK1/2 will be (VCC powerlevel-detect AND RESETCON# AND PSIN AND
ATXPG) if bit0 of Index 2Ch is 1, or (VCC powerlevel-detect AND RESETCON# AND PSIN) if the bit
is 0.
91
PCIRSTIN#
DI
VCC
19
VID0/GP30
DIO8/
DIOD8
VCC
DIO8/
DIOD8
VCC
DIO8/
DIOD8
VCC
DIO8/
DIOD8
VCC
PCI Reset Input #.
• PCI Reset Input #.
18
17
16
VID1/GP31
VID2/GP32
VID3/GP33
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Voltage ID 0 / General Purpose I/O 30.
• The first function of this pin is Voltage ID Input 0. The
Voltage ID is the voltage supply readouts from the
CPU. This value is read in the VID register. The input
threshold can be selected by the power-on strapping
of JP6 (pin 2). (2.0/0.8V when JP6=1, 0.8/0.4V when
JP6=0)
• The second function of this pin is the General
Purpose I/O 30.
• The function configuration of this pin is decided by
the software configuration registers.
Voltage ID 1 / General Purpose I/O 31.
• The first function of this pin is Voltage ID Input 1. The
Voltage ID is the voltage supply readouts from the
CPU. This value is read in the VID register. The input
threshold can be selected by the power-on strapping
of JP6 (pin 2). (2.0/0.8V when JP6=1, 0.8/0.4V when
JP6=0)
• The second function of this pin is the General
Purpose I/O 31.
• The function configuration of this pin is decided by
the software configuration registers.
Voltage ID 2 / General Purpose I/O 32.
• The first function of this pin is Voltage ID Input 2. The
Voltage ID is the voltage supply readouts from the
CPU. This value is read in the VID register. The input
threshold can be selected by the power-on strapping
of JP6 (pin 2). (2.0/0.8V when JP6=1, 0.8/0.4V when
JP6=0)
• The second function of this pin is the General
Purpose I/O 32.
• The function configuration of this pin is decided by
the software configuration registers.
Voltage ID 3 / General Purpose I/O 33.
• The first function of this pin is Voltage ID Input 3. The
Voltage ID is the voltage supply readouts from the
CPU. This value is read in the VID register. The input
threshold can be selected by the power-on strapping
of JP6 (pin 2). (2.0/0.8V when JP6=1, 0.8/0.4V when
JP6=0)
19
IT8702F V0.5
IT8702F
Pin(s) No.
Symbol
Attribute
Power
Description
• The second function of this pin is the General
Purpose I/O 33.
• The function configuration of this pin is decided by
the software configuration registers.
14
13
VID4/GP34
VID5/GP35
68
COPEN#
DIO8/
DIOD8
VCC
DIO8/
DIOD8
VCC
DIOD8
VCCH
or VBAT
Voltage ID 4 / General Purpose I/O 34.
• The first function of this pin is Voltage ID Input 4. The
Voltage ID is the voltage supply readouts from the
CPU. This value is read in the VID register. The input
threshold can be selected by the power-on strapping
of JP6 (pin 2). (2.0/0.8V when JP6=1, 0.8/0.4V when
JP6=0)
• The second function of this pin is the General
Purpose I/O 34.
• The function configuration of this pin is decided by
the software configuration registers.
Voltage ID 5 / General Purpose I/O 35.
• The first function of this pin is Voltage ID Input 5. The
Voltage ID is the voltage supply readouts from the
CPU. This value is read in the VID register. The input
threshold can be selected by the power-on strapping
of JP6 (pin 2). (2.0/0.8V when JP6=1, 0.8/0.4V when
JP6=0)
• The second function of this pin is the General
Purpose I/O 35.
• The function configuration of this pin is decided by
the software configuration registers.
Case Open Detection #.
• The Case Open Detection is connected to a specially
designed low power CMOS flip-flop backed by the
battery for case open state preservation during power
loss.
Note 1: If the power-on strapping input JP4 is low, the output attributes of these pins will be push-pull.
IO Cell:
DO8: 8mA Digital Output buffer
DOD8: 8mA Digital Open-Drain Output buffer
DO16: 16mA Digital Output buffer
DO24: 24mA Digital Output buffer
DO40: 48mA Digital Output buffer
DIO8: 8mA Digital Input/Output buffer
DIOD8: 8mA Digital Open-Drain Input/Output buffer
DIO16: 16mA Digital Input/Output buffer
DIOD16: 16mA Digital Open-Drain Input/Output buffer
DIO24: 24mA Digital Input/Output buffer
DIOD24: 24mA Digital Open-Drain Input/Output buffer
DI: Digital Input
AI: Analog Input
AO: Analog Output
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20
IT8702F V0.5
List of GPIO Pins
6. List of GPIO Pins
Table 6-1. General Purpose I/O Group 1 (Set 1)
Pin(s) No.
84
Symbol
PCIRST4#/
SCRPSNT#/
34
33
32
31
30
29
28
GP10
PCIRST3#/
SCRCLK/
GP11
PCIRST2#/
SCRIO/GP12
PWROK1/
SCRPFET#/
GP13
PCIRST1#/
SCRRST/
GP14
RESETCON#
/CIRTX/GP15
MIDI_IN/
GP16
MIDI_OUT/
GP17
Attribute
DOD8/
DI/DIOD8
Description
PCI Reset 4 # / Smart Card Present Detect # / General Purpose I/O
10.
DOD8/
DOD8/
DIOD8
DOD8/DIO
D8/DIOD8
DOD8/
DOD8/
DIOD8
DOD8/
DOD8/
DIOD8
DI/DOD8/
DIOD8
DI/DIOD8
PCI Reset 3 # / Smart Card Clock / General Purpose I/O 11.
DO8/
DIOD8
PCI Reset 2 # / Smart Card Serial Data I/O / General Purpose I/O 12.
Power OK 1 of VCC / Smart Card Power FET Control Output # /
General Purpose I/O 13.
PCI Reset 1 # /Smart Card Reset / General Purpose I/O 14.
Reset Connect # /Consumer Infrared Transmit Output / General
Purpose I/O 15.
MIDI Input / General Purpose I/O 16.
MIDI Output / General Purpose I/O 17.
Table 6-2. General Purpose I/O Group 2 (Set 2)
Pin(s) No.
27
26
25
24
23
22
21
20
Symbol
JSACX/
GP20
JSACY/
GP21
JSAB1/
GP22
JSAB2/
GP23
FAN_TAC5/
JSBCX/
GP24
FAN_TAC4/
JSBCY/
GP25
FAN_CTL5/
JSBB1/
GP26
FAN_CTL4/
JSBB2/
GP27
Attribute
DIOD8/
DIOD8
DIOD8/
DIOD8
DI/DIOD8
Description
Joystick A Coordinate X / General Purpose I/O 20.
DI/DIOD8
Joystick A Button 2 / General Purpose I/O 23.
DI/
DIOD8/
DIOD8
DI/
DIOD8/
DIOD8
DOD8/
DI/
DIOD8
DOD8/
DI/
DIOD8
Joystick A Coordinate Y / General Purpose I/O 21.
Joystick A Button 1 / General Purpose I/O 22.
Joystick B Coordinate X / General Purpose I/O 24.
Joystick B Coordinate Y / General Purpose I/O 25.
Joystick B Button 1 / General Purpose I/O 26.
Joystick B Button 2 / General Purpose I/O 27.
Table 6-3. General Purpose I/O Group 3 (Set 3)
Pin(s) No.
19
Symbol
VID0/GP30
18
VID1/GP31
17
VID2/GP32
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Attribute
DIO8/DIO
D8
DIO8/DIO
D8
DIO8/DIO
D8
Description
Voltage ID 0 / General Purpose I/O 30.
Voltage ID 1 / General Purpose I/O 31.
Voltage ID 2 / General Purpose I/O 32.
21
IT8702F V0.5
IT8702F
Pin(s) No.
16
Symbol
VID3/GP33
14
VID4/GP34
13
VID5/GP35
12
FAN_CTL3/G
P36
FAN_TAC3/G
P37
11
Attribute
DIO8/DIO
D8
DIO8/DIO
D8
DIO8/DIO
D8
DOD8/
DIOD8
DI/DIOD8
Description
Voltage ID 3 / General Purpose I/O 33.
Voltage ID 4 / General Purpose I/O 34.
Voltage ID 5 / General Purpose I/O 35.
Fan Control Output 3 / General Purpose I/O 36.
Fan Tachometer Input 3 / General Purpose I/O 37.
Table 6-4. General Purpose I/O Group 4 (Set 4)
Pin(s) No.
79
78
76
75
72
71
70
66
Symbol
GP40
PWROK2/
GP41
PSON#/
GP42
PANSWH#/G
P43
PWRON#/
GP44
PSIN/GP45
IRRX/GP46
IRTX/GP47
Attribute
DIOD8
DOD8/DIO
D8
DOD8/
DIOD8
DI/DIOD8
Description
General Purpose I/O 40.
Power OK 2 of VCC / General Purpose I/O 41.
DOD8/
DIOD8
DI/DIOD8
DI/DIOD8
DO8/
DIOD8
Power On Request Output # / General Purpose I/O 44.
Power Supply On-Off Control Output # / General Purpose I/O 42.
Main Power Switch Button Input # / General Purpose I/O 43.
PSIN Input / General Purpose I/O 45.
Infrared Receive Input / General Purpose I/O 46.
Infrared Transmit Output / General Purpose I/O 47.
Table 6-5. General Purpose I/O Group 5 (Set 5)
Pin(s) No.
48
10
9
77
73
85
Symbol
PCIRST5#/
CLKRUN#/
GP50
FAN_CTL2/G
P51
FAN_TAC2/G
P52
GP53
PME#/GP54
RSMRST#/
CIRRX /GP55
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Attribute
DO8/
DIOD16/
DIOD16
DOD8/
DIOD8
DI/DIOD8
Description
PCIRST5#/Clock Run # / General Purpose I/O 50.
DIOD8
DOD8/
DIOD8
DOD8/ DI /
DIOD8
General Purpose I/O 53.
Power Management Event # / General Purpose I/O 54.
Fan Control Output 2 / General Purpose I/O 51.
Fan Tachometer Input 2 / General Purpose I/O 52.
Resume Reset # / Consumer Infrared Receive Input / General
Purpose I/O 55.
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IT8702F V0.5
Power on Strapping Options
7. Power On Strapping Options and Special Pin Routings
Table 7-1. Power On Strapping Options
JP1
JP2
Symbol
Value
KBCEN
1
KBC is enabled.
0
KBC is disabled.
1
KBC’s ROM is built in.
0
KBC’s ROM is external. This is used for custom code verification. A
special application circuit is required.
KBC_IROM
Description
JP3
CHIP_SEL
--
Chip selection in Configuration.
JP4
BUF_SEL
1
The output buffers of PCIRST1#, PCIRST2#, PCIRST3#, PCIRST4# and
PCIRST5# are enhanced open-drain. It drives high about 10~20 ns when
the signal transits from low to high, and then Hi-Z.
0
The output buffers are push-pull.
1
The default value of FAN Controller Index 15h/16h/17h is 00h.
0
The default value of FAN Controller Index 15h/16h/17h is 40h.
1
The threshold voltage of VID is 2.0/0.8V.
0
The threshold voltage of VID is 0.8/0.4V.
JP5
JP6
FAN_CTL_SEL
VID_ISEL
Intel
ICH
PWBTN#
SUSB#
VCCH
PSIN
(71)
PWRON#
(72)
System
On-Off
Button
IT8702F
PANSWH#
(75)
PSON#(76)
ATX
Power Supply
PSON#
Figure 7-1. IT8702F Special Applications Circuitry for Intel ICH
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23
IT8702F V0.5
This page is intentionally left blank.
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24
IT8702F V0.5
Configuration
8. Configuration
8.1
Configuring Sequence Description
After the hardware reset or power-on reset, the IT8702F enters the normal mode with all logical devices
disabled except KBC. The initial state (enable bit) of this logical device (KBC) is determined by the state of
pin 121 (DTR1# ) at the falling edge of the system reset during power-on reset.
Hardware Reset
Any other I/O transition cycle
Wait for key string
I/O write to 2Eh
N
Is the data
"87h" ?
Y
Any other I/O transition cycle
Check Pass key
I/O write to 2Eh
N
Next Data?
Y
N
Last Data?
Y
MB PnP Mode
There are three steps to completing the configuration setup: (1) Enter the MB PnP Mode; (2) Modify the data
of configuration registers; (3) Exit the MB PnP Mode. Undesired result may occur if
the MB PnP Mode is not exited normally.
(1) Enter the MB PnP Mode
To enter the MB PnP Mode, four special I/O write operations are to be performed during Wait for Key state.
To ensure the initial state of the key-check logic, it is necessary to perform four
write operations to the Special Address port (2Eh). Two different enter keys are
provided to select configuration ports (2Eh/2Fh or 4Eh/4Fh) of the next step.
87h, 01h, 55h, 55h;
or 87h, 01h, 55h, AAh;
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Address port Data port
2Eh
2Fh
4Eh
4Fh
25
IT8702F V0.5
IT8702F
(2) Modify the Data of the Registers
All configuration registers can be accessed after entering the MB PnP Mode. Before accessing a selected
register, the content of Index 07h must be changed to the LDN to which the register
belongs, except some Global registers.
(3) Exit the MB PnP Mode
Set bit 1 of the configure control register (Index=02h) to “1” to exit the MB PnP Mode.
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26
IT8702F V0.5
Configuration
8.2
Description of the Configuration Registers
All the registers except APC/PME’ registers will be reset to the default state when RESET is activated.
Table 8-1. Global Configuration Registers
LDN
Index
R/W
Reset
Configuration Register or Action
All
02h
W
NA
Configure Control
All
07h
R/W
NA
Logical Device Number (LDN)
All
20h
R
87h
Chip ID Byte 1
All
21h
R
02h
Chip ID Byte 2
All
22h
W-R
07h
Configuration Select and Chip Version
All
23h
R/W
00h
Clock Selection Register
All
24h
R/W
00h
Software Suspend
07h
Note1
25h
R/W
01h
GPIO Set 1 Multi-Function Pin Selection Register
07h
Note1
26h
R/W
00h
GPIO Set 2 Multi-Function Pin Selection Register
07h
Note1
27h
R/W
00h
GPIO Set 3 Multi-Function Pin Selection Register
07h
Note1
28h
R/W
40h
GPIO Set 4 Multi-Function Pin Selection Register
07h
Note1
29h
R/W
00h
GPIO Set 5 Multi-Function Pin Selection Register
07h
Note1
2Ah
R/W
00h
Extended 1 Multi-Function Pin Selection Register
All
2Bh
R/W
00h
Logical Block Configuration Lock Register
07h
Note1
2Ch
R/W
00h
Extended 2 Multi-Function Pin Selection Register
F4h
Note1
2Eh
R/W
00h
Test 1 Register
F4h
Note1
2Fh
R/W
00h
Test 2 Register
Table 8-2. FDC Configuration Registers
LDN
Index
R/W
Reset
Configuration Register or Action
00h
30h
R/W
00h
FDC Activate
00h
60h
R/W
03h
FDC Base Address MSB Register
00h
61h
R/W
F0h
FDC Base Address LSB Register
00h
70h
R/W
06h
FDC Interrupt Level Select
00h
74h
R/W
02h
FDC DMA Channel Select
00h
F0h
R/W
00h
FDC Special Configuration Register 1
00h
F1h
R/W
00h
FDC Special Configuration Register 2
Table 8-3. Serial Port 1 Configuration Registers
LDN
Index
R/W
Reset
01h
30h
R/W
00h
Serial Port 1 Activate
01h
60h
R/W
03h
Serial Port 1 Base Address MSB Register
01h
61h
R/W
F8h
Serial Port 1 Base Address LSB Register
01h
70h
R/W
04h
Serial Port 1 Interrupt Level Select
01h
F0h
R/W
00h
Serial Port 1 Special Configuration Register 1
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Configuration Register or Action
27
IT8702F V0.5
IT8702F
LDN
Index
R/W
Reset
Configuration Register or Action
01h
F1h
R/W
50h
Serial Port 1 Special Configuration Register 2
01h
F2h
R/W
00h
Serial Port 1 Special Configuration Register 3
01h
F3h
R/W
7Fh
Serial Port 1 Special Configuration Register 4
Table 8-4. Serial Port 2 Configuration Registers
LDN
Index
R/W
Reset
Configuration Register or Action
02h
30h
R/W
00h
Serial Port 2 Activate
02h
60h
R/W
02h
Serial Port 2 Base Address MSB Register
02h
61h
R/W
F8h
Serial Port 2 Base Address LSB Register
02h
70h
R/W
03h
Serial Port 2 Interrupt Level Select
02h
F0h
R/W
00h
Serial Port 2 Special Configuration Register 1
02h
F1h
R/W
50h
Serial Port 2 Special Configuration Register 2
02h
F2h
R/W
00h
Serial Port 2 Special Configuration Register 3
02h
F3h
R/W
7Fh
Serial Port 2 Special Configuration Register 4
Table 8-5. Parallel Port Configuration Registers
LDN
Index
R/W
Reset
Configuration Register or Action
03h
30h
R/W
00h
Parallel Port Activate
03h
60h
R/W
03h
Parallel Port Primary Base Address MSB Register
03h
61h
R/W
78h
Parallel Port Primary Base Address LSB Register
03h
62h
R/W
07h
Parallel Port Secondary Base Address MSB Register
03h
63h
R/W
78h
Parallel Port Secondary Base Address LSB Register
03h
70h
R/W
07h
Parallel Port Interrupt Level Select
03h
74h
R/W
03h
Parallel Port DMA Channel Select Note2
03h
F0h
R/W
03h Note3
Parallel Port Special Configuration Register
Table 8-6. FAN Controller Configuration Registers
LDN
Index
R/W
Reset
04h
30h
R/W
00h
FAN Controller Activate
04h
60h
R/W
02h
FAN Controller Base Address MSB Register
04h
61h
R/W
90h
FAN Controller Base Address LSB Register
04h
62h
R/W
02h
PME Direct Access Base Address MSB Register
04h
63h
R/W
30h
PME Direct Access Base Address LSB Register
04h
70h
R/W
09h
FAN Controller Interrupt Level Select
04h
F0h
R/W
00h
APC/PME Event Enable Register
04h
F1h
R/W
00h
APC/PME Status Register
04h
F2h
R/W
00h
APC/PME Control Register 1
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Configuration Register or Action
28
IT8702F V0.5
Configuration
LDN
Index
R/W
Reset
Configuration Register or Action
04h
F3h
R/W
00h
FAN Controller Special Configuration Register
04h
F4h
R-R/W
00h
APC/PME Control Register 2
04h
F5h
R/W
-
APC/PME Special Code Index Register
04h
F6h
R/W
-
APC/PME Special Code Data Register
Table 8-7. KBC(Keyboard) Configuration Registers
LDN
Index
R/W
Reset
Configuration Register or Action
KBC Activate
05h
30h
R/W
Note4
05h
60h
R/W
00h
KBC Data Base Address MSB Register
05h
61h
R/W
60h
KBC Data Base Address LSB Register
05h
62h
R/W
00h
KBC Command Base Address MSB Register
05h
63h
R/W
64h
KBC Command Base Address LSB Register
05h
70h
R/W
01h
KBC Interrupt Level Select
05h
71h
R-R/W
02h
KBC Interrupt Type Note5
05h
F0h
R/W
00h
KBC Special Configuration Register
Table 8-8. KBC(Mouse) Configuration Registers
LDN
Index
R/W
Reset
06h
30h
R/W
00h
KBC (Mouse) Activate
06h
70h
R/W
0Ch
KBC (Mouse) Interrupt Level Select
06h
71h
R-R/W
02h
KBC (Mouse) Interrupt Type Note5
06h
F0h
R/W
00h
KBC (Mouse) Special Configuration Register
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Configuration Register or Action
29
IT8702F V0.5
IT8702F
Table 8-9. GPIO Configuration Registers
LDN
Index
R/W
Reset
07h
60h
R/W
00h
SMI# Normal Run Access Base Address MSB Register
07h
61h
R/W
00h
SMI# Normal Run Access Base Address LSB Register
07h
62h
R/W
00h
Simple I/O Base Address MSB Register
07h
63h
R/W
00h
Simple I/O Base Address LSB Register
07h
64h
R/W
00h
Panel Button De-bounce Base Address MSB Register
07h
65h
R/W
00h
Panel Button De-bounce Base Address LSB Register
07h
70h
R/W
00h
Panel Button De-bounce Interrupt Level Select Register
07h
71h
R/W
00h
Watch Dog Timer Control Register
07h
72h
R/W
00h
Watch Dog Timer Configuration Register
07h
73h
R/W
00h
Watch Dog Timer Time-out Value Register
07h
B0h
R/W
00h
GPIO Set 1 Pin Polarity Register
07h
B1h
R/W
00h
GPIO Set 2 Pin Polarity Register
07h
B2h
R/W
00h
GPIO Set 3 Pin Polarity Register
07h
B3h
R/W
00h
GPIO Set 4 Pin Polarity Register
07h
B4h
R/W
00h
GPIO Set 5 Pin Polarity Register
07h
B8h
R/W
00h
GPIO Set 1 Pin Internal Pull-up Enable Register
07h
B9h
R/W
00h
GPIO Set 2 Pin Internal Pull-up Enable Register
07h
BAh
R/W
00h
GPIO Set 3 Pin Internal Pull-up Enable Register
07h
BBh
R/W
00h
GPIO Set 4 Pin Internal Pull-up Enable Register
07h
BCh
R/W
00h
GPIO Set 5 Pin Internal Pull-up Enable Register
07h
C0h
R/W
01h
Simple I/O Set 1 Enable Register
07h
C1h
R/W
00h
Simple I/O Set 2 Enable Register
07h
C2h
R/W
00h
Simple I/O Set 3 Enable Register
07h
C3h
R/W
40h
Simple I/O Set 4 Enable Register
07h
C4h
R/W
00h
Simple I/O Set 5 Enable Register
07h
C8h
R/W
01h
Simple I/O Set 1 Output Enable Register
07h
C9h
R/W
00h
Simple I/O Set 2 Output Enable Register
07h
CAh
R/W
00h
Simple I/O Set 3 Output Enable Register
07h
CBh
R/W
40h
Simple I/O Set 4 Output Enable Register
07h
CCh
R/W
00h
Simple I/O Set 5 Output Enable Register
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Configuration Register or Action
30
IT8702F V0.5
Configuration
Table 8-10. GPIO Configuration Registers
LDN
Index
R/W
Reset
07h
D0h
R/W
00h
Panel Button De-bounce Control Register
07h
D1h
R/W
00h
Panel Button De-bounce Set 1 Enable Register
07h
D2h
R/W
00h
Panel Button De-bounce Set 2 Enable Register
07h
D3h
R/W
00h
Panel Button De-bounce Set 3 Enable Register
07h
D4h
R/W
00h
Panel Button De-bounce Set 4 Enable Register
07h
D5h
R/W
00h
Panel Button De-bounce Set 5 Enable Register
07h
E3h
R/W
00h
IRQ3 External Routing Input Pin Mapping Register
07h
E4h
R/W
00h
IRQ4 External Routing Input Pin Mapping Register
07h
E5h
R/W
00h
IRQ5 External Routing Input Pin Mapping Register
07h
E6h
R/W
00h
IRQ6 External Routing Input Pin Mapping Register
07h
E7h
R/W
00h
IRQ7 External Routing Input Pin Mapping Register
07h
E9h
R/W
00h
IRQ9 External Routing Input Pin Mapping Register
07h
EAh
R/W
00h
IRQ10 External Routing Input Pin Mapping Register
07h
EBh
R/W
00h
IRQ11 External Routing Input Pin Mapping Register
07h
ECh
R/W
00h
IRQ12 External Routing Input Pin Mapping Register
07h
EEh
R/W
00h
IRQ14 External Routing Input Pin Mapping Register
07h
EFh
R/W
00h
IRQ15 External Routing Input Pin Mapping Register
07h
F0h
R/W
00h
SMI# Control Register 1
07h
F1h
R/W
00h
SMI# Control Register 2
07h
F2h
R/W
00h
SMI# Status Register 1
07h
F3h
R/W
00h
SMI# Status Register 2
07h
F4h
R/W
00h
SMI# Pin Mapping Register
07h
F5h
R/W
00h
Hardware Monitor Thermal Output Pin Mapping Register
07h
F6h
R/W
00h
Hardware Monitor Alert Beep Pin Mapping Register
07h
F7h
R/W
00h
Keyboard Lock Pin Mapping Register
07h
F8h
R/W
00h
GP LED Blinking 1 Pin Mapping Register
07h
F9h
R/W
00h
GP LED Blinking 1 Control Register
07h
FAh
R/W
00h
GP LED Blinking 2 Pin Mapping Register
07h
FBh
R/W
00h
GP LED Blinking 2 Control Register
07h
FCh
R/W-R
--h
VID Input Register
07h
FDh
R/W
00h
VID Output Register
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Configuration Register or Action
31
IT8702F V0.5
IT8702F
Table 8-11. MIDI Port Configuration Registers
LDN
Index
R/W
Reset
Configuration Register or Action
08h
30h
R/W
00h
MIDI Port Activate
08h
60h
R/W
03h
MIDI Port Base Address MSB Register
08h
61h
R/W
00h
MIDI Port Base Address LSB Register
08h
70h
R/W
0Ah
MIDI Port Interrupt Level Select
08h
F0h
R/W
00h
MIDI Port Special Configuration Register
Table 8-12. Game Port Configuration Registers
LDN
Index
R/W
Reset
Configuration Register or Action
09h
30h
R/W
00h
Game Port Activate
09h
60h
R/W
02h
Game Port Base Address MSB Register
09h
61h
R/W
01h
Game Port Base Address LSB Register
Table 8-13. Consumer IR Configuration Registers
LDN
Index
R/W
Reset
Configuration Register or Action
0Ah
30h
R/W
00h
Consumer IR Activate
0Ah
60h
R/W
03h
Consumer IR Base Address MSB Register
0Ah
61h
R/W
10h
Consumer IR Base Address LSB Register
0Ah
70h
R/W
0Bh
Consumer IR Interrupt Level Select
0Ah
F0h
R/W
00h
Consumer IR Special Configuration Register
Note 1: All these registers can be read from all LDNs.
Note 2: When the ECP mode is not enabled, this register is read only as “04h”, and cannot be written.
Note 3: When the bit 2 of the Primary Base Address LSB Register of Parallel Port is set to 1, the EPP mode
cannot be enabled. Bit 0 of this register is always 0.
Note 4: The initial value of the activate bit of KBC is determined by the latched state of DTR1# at the rising
edge of the LRESET# signal.
Note 5: These registers are read only unless the write enable bit (Index=F0h) is asserted.
8.2.1
Logical Device Base Address
The base I/O range of logical devices shown below is located in the base I/O address range of each logical
device.
Table 8-14. Base Address of Logical Devices
Logical Devices
Address
LDN=0 FDC
Base + (2 - 5) and + 7
LDN=1 SERIAL PORT 1
Base + (0 -7)
LDN=2 SERIAL PORT 2
Base1 + (0 -7)
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Notes
COM port
32
IT8702F V0.5
Configuration
Logical Devices
LDN=3
PARALLEL PORT
Address
Notes
Base1 + (0 -3)
SPP
Base1 + (0 -7)
SPP+EPP
Base1 + (0 -3) and Base2 + (0 -3)
SPP+ECP
Base1 + (0 -7) and Base2 + (0 -3)
SPP+EPP+ECP
Base3
POST data port
LDN=4
FAN Controller
Base1 + (0 -7)
FAN Controller
Base2 + (0 -3)
PME#
LDN=5 KBC
Base1 + Base2
KBC
LDN=8 MIDI port
Base + (0 -1)
LDN=9 Game Port
Base
LDN=A Consumer IR
Base + (0 -7)
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IT8702F V0.5
IT8702F
8.3
Global Configuration Registers (LDN: All)
8.3.1
Configure Control (Index=02h)
This register is write only. Its values are not sticky; that is to say, a hardware reset will automatically clear
the bits, and does not require the software to clear them.
Bit
7-2
1
0
8.3.2
Description
Reserved
Returns to the “Wait for Key” state. This bit is used when the configuration sequence is
completed.
Resets all logical devices and restores configuration registers to their power-on states.
Logical Device Number (LDN, Index=07h)
This register is used to select the current logical devices. By reading from or writing to the configuration of I/O,
Interrupt, DMA and other special functions, all registers of the logical devices can be accessed. In addition,
ACTIVATE command is only effective for the selected logical devices. This register is read/write.
8.3.3
Chip ID Byte 1 (Index=20h, Default=87h)
This register is the Chip ID Byte 1 and is read only. Bits [7:0]=87h when read.
8.3.4
Chip ID Byte 2 (Index=21h, Default=02h)
This register is the Chip ID Byte 2 and is read only. Bits [7:0]=02h when read.
8.3.5
Bit
7
6-4
3-0
8.3.6
Bit
7-6
Configuration Select and Chip Version (Index=22h, Default=07h)
Description
Configuration Select
This bit is used to select the chip, which needs to be configured. When there are two IT8702F
chips in a system, and a “1” is written, this bit will select JP3=1 (power-on strapping value of
SOUT1) to be configured. The chip with JP3=0 will exit the configuration mode. To write “0”, the
chip with JP3=0 will be configured and the chip with JP3=0 will exit. If no write operations occur
on this register, both chips will be configured.
Reserved
Version
4h = Version D
5h = Version G
6h = Version H
7h = Version I
See Application Note that shows how to built a single design which accepts any versions of this
chip.
Clock Selection Register (Index=23h, Default=00h)
Description
XLOCK select
These two bits determine XLOCK function.
00: Software XLOCK (default)
01: Reserved
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IT8702F V0.5
Configuration
Bit
5
4
3
2-1
0
8.3.7
Description
10: Pin 48 (GP50)
11: Pin 11 (GP37)
Reserved
Clock Source Select of Watch Dog Timer
0: Internal oscillating clock (default)
1: External CLKIN
Selects the delay of PWROK1/2.
0: POWOK1/2 will be delayed 300 ~600ms from VCC5V > 4.0V.
1: POWOK1/2 will be delayed 150 ~300ms from VCC5V > 4.0V.
Reserved
CLKIN Frequency
0: 48 MHz.
1: 24 MHz.
Software Suspend (Index=24h, Default=00h, MB PnP)
This register is the Software Suspend register. When the bit 0 is set, the IT8702F enters the “Software
Suspend” state. All the devices, except KBC, remain inactive until this bit is cleared or when the wake-up
event occurs. The wake-up event occurs at any transition on signals RI1# (pin 119) and Rl2# (pin 127).
8.3.8
GPIO Set 1 Multi-Function Pin Selection Register (Index=25h, Default=01h)
If the enabled bits are not set, the multi-function pins will perform the original functions. On the other hand, if
they are set, they will perform the GPIO functions. This register can be read from any LDN, but can only be
written if LDN=07h.
Bit
7
6
5
4
3
2
1
0
Description
Function Selection of pin 28
0: MIDI Output (MIDI_OUT)
1: General Purpose I/O 17 (GP17)
Function Selection of pin 29
0: MIDI Input (MIDI_IN)
1: General Purpose I/O 16 (GP16)
Function Selection of pin 30, if bit5 of index 2A is 1.
0: Consumer Infrared Transmit Output (CIRTX)
1: General Purpose I/O 15 (GP15)
Function Selection of pin 31, if bit4 of index 2A is 1.
0: Smart Card Reset (SCRRST)
1: General Purpose I/O 14 (GP14)
Function Selection of pin 32, if bit3 of index 2A is 1.
0: Smart Card Power FET Control Output #
1: General Purpose I/O 13 (GP13)
Function Selection of pin 33, if bit2 of index 2A is 1.
0: Smart Card Serial Data I/O (SCRIO)
1: General Purpose I/O 12 (GP12)
Function Selection of pin 34, if bit1 of index 2A is 1.
0: Smart Card Clock (SCRCLK)
1: General Purpose I/O 11 (GP11)
Function Selection of pin 84, if bit0 of index 2A is 1.
0: Smart Card Present Detect# (SCRPSNT#)
1: General Purpose I/O 10 (GP10)
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IT8702F V0.5
IT8702F
8.3.9
GPIO Set 2 Multi-Function Pin Selection Register (Index=26h, Default=00h)
If the enabled bits are not set, the multi-function pins will perform the original functions. On the other hand, if
they are set, they will perform the GPIO functions. This register can be read from any LDN, but can only be
written if LDN=07h.
Bit
7
6
5
4
3
2
1
0
8.3.10
Description
Function Selection of pin 20
0: Joystick B Button 2 (JSBB2)
1: General Purpose I/O 27 (GP27)
Function Selection of pin 21
0: Joystick B Button 1 (JSBB1)
1: General Purpose I/O 26 (GP26)
Function Selection of pin 22
0: Joystick B Coordinate Y (JSBCY)
1: General Purpose I/O 25 (GP25)
Function Selection of pin 23
0: Joystick B Coordinate X (JSBCX)
1: General Purpose I/O 24 (GP24)
Function Selection of pin 24
0: Joystick A Button 2 (JSAB2)
1: General Purpose I/O 23 (GP23)
Function Selection of pin 25
0: Joystick A Button 1 (JSAB1)
1: General Purpose I/O 22 (GP22)
Function Selection of pin 26
0: Joystick A Coordinate Y (JSACY)
1: General Purpose I/O 21 (GP21)
Function Selection of pin 27
0: Joystick A Coordinate X (JSACX)
1: General Purpose I/O 20 (GP20)
GPIO Set 3 Multi-Function Pin Selection Register (Index=27h, Default=00h)
If the enabled bits are not set, the multi-function pins will perform the original functions. On the other hand, if
they are set, they will perform the GPIO functions. This register can be read from any LDN, but can only be
written if LDN=07h.
Bit
7
6
5
4
3
Description
Function Selection of pin 11
0: Fan Tachometer Input 3 (FAN_TAC3)
1: General Purpose I/O 37 (GP37)
Function Selection of pin 12
0: Fan Control Output 3 (FAN_CTL3)
1: General Purpose I/O 36 (GP36)
Function Selection of pin 13
0: Voltage ID5 (VID5)
1: General Purpose I/O 35 (GP35)
Function Selection of pin 14
0: Voltage ID4 (VID4)
1: General Purpose I/O 34 (GP34)
Function Selection of pin 16
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IT8702F V0.5
Configuration
Bit
2
1
0
8.3.11
Description
0: Voltage ID3 (VID3)
1: General Purpose I/O 33 (GP33)
Function Selection of pin 17
0: Voltage ID2 (VID2)
1: General Purpose I/O 32 (GP32)
Function Selection of pin 18
0: Voltage ID1 (VID1)
1: General Purpose I/O 31 (GP31)
Function Selection of pin 19
0: Voltage ID0 (VID0)
1: General Purpose I/O 30 (GP30)
GPIO Set 4 Multi-Function Pin Selection Register (Index=28h, Default=40h)
If the enabled bits are not set, the multi-function pins will perform the original functions. On the other hand, if
they are set, they will perform the GPIO functions. This register can be read from any LDN, but can only be
written if LDN=07h.
Bit
Description
7
Function Selection of pin 66
0: Infrared Transmit Output (IRTX).
1: General Purpose I/O 47 (GP47).
6
Function Selection of pin 70
0: Infrared Receive Input (IRRX).
1: General Purpose I/O 46 (GP46).
5
Function Selection of pin 71
0: PSIN (SUSB#)
1: General Purpose I/O 45 (GP45).
4
Function Selection of pin 72
0: Power On Request Output # (PWRON#).
1: General Purpose I/O 44 (GP44).
3
Function Selection of pin 75
0: Main Power Switch Button Input # (PANSWH#).
1: General Purpose I/O 43 (GP43).
2
Function Selection of pin 76
0: Power Supply ON-Off Control Output # (PSON#).
1: General Purpose I/O 42 (GP42).
1
Function Selection of pin 78
0: PWROK2.
1: General Purpose I/O 41 (GP41).
0
Function Selection of pin 79
0: Reserved.
1: General Purpose I/O 40 (GP40).
8.3.12
GPIO Set 5 Multi-Function Pin Selection Register (Index=29h, Default=00h)
If the enabled bits are not set, the multi-function pins will perform the original functions. On the other hand, if
they are set, they will perform the GPIO functions. This register can be read from any LDN, but can only be
written if LDN=07h.
Bit
7
Description
Reserved
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IT8702F V0.5
IT8702F
Bit
6
5
4
3
2
1
0
8.3.13
Description
Reserved.
Function Selection of pin 85.
0: Consumer Infrared Receive Input (CIRRX) or RSMRST#. RSMRST# is an open-drain output
function, which is active low about 16ms when VCCH5V is power-on.
1: General Purpose I/O 55 (GP55).
Function Selection of pin 73.
0: Power Management Event # (PME#).
1: General Purpose I/O 54 (GP54).
Function Selection of pin 77.
0: Reserved.
1: General Purpose I/O 53 (GP53).
Function Selection of pin 9.
0: Fan Tachometer Input 2 (FAN_TAC2).
1: General Purpose I/O 52 (GP52).
Function Selection of pin 10.
0: Fan Control Output 2 (FAN_CTL2).
1: General Purpose I/O 51 (GP51).
Function Selection of pin 48.
0: Clock Run # (CLKRUN#) or PCIRST5#, selected by bit2 of index 2C.
1: General Purpose I/O 50 (GP50).
Extended 1 Multi-Function Pin Selection Register (Index=2Ah, Default=00h)
This register can be read from any LDN, but can only be written if LDN=07h.
Bit
7
6
5
4
3
2
1
0
Description
Reserved.
Multi-function selection of pin 53.
0: MTRB#.
1: Thermal Output #.
Extended multi-function selection of 30.
0: RESETCON#.
1: Determined by bit5 of GPIO Set 1 Multi-function Selection Register (Index 25h).
Extended multi-function selection of pin 31.
0: PCIRST1#.
1: Determined by bit4 of GPIO Set 1 Multi-function Selection Register (Index 25h).
Extended multi-function selection of pin 32.
0: PWROK1.
1: Determined by bit3 of GPIO Set 1 Multi-function Selection Register (Index 25h).
Extended multi-function selection of pin 33.
0: PCIRST2#.
1: Determined by bit2 of GPIO Set 1 Multi-function Selection Register (Index 25h).
Extended multi-function selection of pin 34.
0: PCIRST3#.
1: Determined by bit1 of GPIO Set 1 Multi-function Selection Register (Index 25h).
Extended multi-function selection of pin 84.
0: PCIRST4#.
1: Determined by bit0 of GPIO Set 1 Multi-function Selection Register (Index 25h).
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IT8702F V0.5
Configuration
8.3.14
Logical Block Lock Register (Index=2Bh, Default=00h)
When lock function is enabled (bit7=1 or XLOCK# is low), configuration registers of the selected logical block
and Clock Selection register (index = 23h), and this register will be read-only.
Bit
7
6
5
4
3
2
1
0
8.3.15
Description
Software Lock Enable. Once this bit is set to 1 by software, it can be only cleared by
hardware reset.
0: Configuration lock is controlled by XLOCK#. (Default)
1: Configuration registers Logic Blocks selected by bits 6-0 and this register is read-only.
GPIO Select. (LDN7)
0: GPIO Configuration registers are programmable.
1: GPIO Configuration registers are read-only if LOCK is enabled.
KBC (Keyboard) and KBC (Mouse) Select. (LDN5 and LDN6)
0: KBC (Keyboard) and KBC (Mouse) Configuration registers are programmable.
1: KBC (Keyboard) and KBC (Mouse) Configuration registers are read-only if LOCK is enabled.
FAN Controller Select. (LDN4)
0: FAN Controller Configuration registers are programmable.
1: FAN Controller Configuration registers are read-only if LOCK is enabled.
Parallel Port Select. (LDN3)
0: Parallel Port Configuration registers are programmable.
1: Parallel Port Configuration registers are read-only if LOCK is enabled.
Serial Port 2 Select. (LDN2)
0: Serial Port 2 Configuration registers are programmable.
1: Serial Port 2 Configuration registers are read-only if LOCK is enabled.
Serial Port 1 Select. (LDN1)
0: Serial Port 1 Configuration registers are programmable.
1: Serial Port 1 Configuration registers are read-only if LOCK is enabled.
FDC Select. (LDN0) The lock function will not affect bit0 of FDC Special Configuration
register (software write protect).
0: FDC Configuration registers are programmable.
1: FDC Configuration registers are read-only (except Software Write Protect bit) if LOCK is
enabled.
Extended 2 Multi-Function Pin Selection Register (Index=2Ch, Default=1Fh)
This register can be read from any LDN, but can only be written if LDN=07h.
Bit
7-5
4
3
2
1-0
Description
Reserved
Extended multi-function selection of pin 21, 23.
0: Disable FAN_CTL/FAN_TAC set 5.
1: Enable FAN_CTL/FAN_TAC set 5. (Game port should disable.)
Extended multi-function selection of pin 20, 22.
0: Disable FAN_CTL/FAN_TAC set 4.
1: Enable FAN_CTL/FAN_TAC set 4. (Game port should disable.)
Extended multi-function selection of pin 48 if bit0 of Index 29h is 0.
0: Clock Run # (CLKRUN#).
1: PCIRST5#.
Reserved. Must be set to “11b”.
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IT8702F V0.5
IT8702F
8.3.16
Test 1 Register (Index=2Eh, Default=00h)
This register is the Test 1 Register and is reserved for ITE. It should not be set.
8.3.17
Test 2 Register (Index=2Fh, Default=00h)
This register is the Test 2 Register and is reserved for ITE. It should not be set.
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IT8702F V0.5
Configuration
8.4
FDC Configuration Registers (LDN=00h)
8.4.1
Bit
7-1
0
8.4.2
Bit
7-4
3-0
8.4.3
Bit
7-3
2-0
8.4.4
Bit
7-4
3-0
8.4.5
Bit
7-3
2-0
8.4.6
Bit
7-4
3
2
1
0
FDC Activate (Index=30h, Default=00h)
Description
Reserved
FDC Enable
1: Enabled.
0: Disabled.
FDC Base Address MSB Register (Index=60h, Default=03h)
Description
Read only, with “0h” for Base Address [15:12].
Mapped as Base Address [11:8].
FDC Base Address LSB Register (Index=61h, Default=F0h)
Description
Read/write, mapped as Base Address [7:3].
Read only as “000b.”
FDC Interrupt Level Select (Index=70h, Default=06h)
Description
Reserved with default “0h.”
Select the interrupt level Note1 for FDC.
FDC DMA Channel Select (Index=74h, Default=02h)
Description
Reserved with default “00h.”
Select the DMA channel Note2 for FDC.
FDC Special Configuration Register 1 (Index=F0h, Default=00h)
Description
Reserved with default “00h.”
1: IRQ sharing.
0: Normal IRQ.
1: Swap Floppy Drives A, B.
0: Normal.
1: 3-mode.
0: AT-mode.
1: Software Write Protect.
0: Normal.
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IT8702F V0.5
IT8702F
8.4.7
Bit
7-4
3-2
1-0
FDC Special Configuration Register 2 (Index=F1h, Default=00h)
Description
Reserved with default “00h.”
FDD B Data Rate Table Select (DRT1-0).
FDD A Data Rate Table Select (DRT1-0).
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IT8702F V0.5
Configuration
8.5
Serial Port 1 Configuration Registers (LDN=01h)
8.5.1
Bit
7-1
0
8.5.2
Bit
7-4
3-0
8.5.3
Bit
7-3
2-0
8.5.4
Bit
7-4
3-0
8.5.5
Bit
7
6-4
3
2-1
0
Serial Port 1 Activate (Index=30h, Default=00h)
Description
Reserved
Serial Port 1 Enable
1: Enabled.
0: Disabled.
Serial Port 1 Base Address MSB Register (Index=60h, Default=03h)
Description
Read only as “0h” for Base Address[15:12].
Read/write, mapped as Base Address[11:8].
Serial Port 1 Base Address LSB Register (Index=61h, Default=F8h)
Description
Read/write, mapped as Base Address[7:3].
Read only as “000b.”
Serial Port 1 Interrupt Level Select (Index=70h, Default=04h)
Description
Reserved with default “0h.”
Select the interrupt level Note1 for Serial Port 1.
Serial Port 1 Special Configuration Register 1 (Index=F0h, Default=00h)
Description
Reserved
Serial Port 1 Mode Note3
000: Standard (default)
001: IrDA 1.0 (HP SIR)
010 : ASKIR
100 : Smart Card Reader (SCR)
else : Reserved
Reserved with default “0.”
Clock Source.
00: 24 MHz/13 (Standard)
01: 24 MHz/12 (MIDI)
10: Reserved
11: Reserved
1: IRQ sharing.
0: Normal.
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IT8702F V0.5
IT8702F
8.5.6
Bit
7
6
5
4
3
2-0
8.5.7
Serial Port 1 Special Configuration Register 2 (Index=F1h, Default=50h)
Description
1: No transmissions delay (40 bits) when the SIR or ASKIR is switched from RX mode to TX
mode.
0: Transmission delays (40 bits) when the SIR or ASKIR is switched from RX mode to TX mode.
1: No receptions delay (40 bits) when the SIR or ASKIR is switched from TX mode to RX mode.
0: Reception delays (40 bits) when the SIR or ASKIR is switched from TX mode to RX mode.
Single Mask Mode: When set, the RX of UART is masked under TX transmission.
1: Half Duplex (default).
0: Full Duplex.
SIR RX polarity
1: Active low
0: Active high
Reserved
Serial Port 1 Special Configuration Register 3 (Index=F2h, Default=00h)
This register is valid only when Serial Port 1’s Mode is Smart Card Reader.
Bit
7-3
2
1-0
8.5.8
Description
Reserved
SCRPFET# polarity
1: Active high
0: Active low
SCR_CLKSEL1-0
00: Stop
01: 3.5 MHz
10: 7.1 MHz
11: Special Divisor (96 MHz/DIV96M)
Serial Port 1 Special Configuration Register 4 (Index=F3h, Default=7Fh)
This register is valid only when Serial Port 1’s Mode is Smart Card Reader.
Bit
7
6-0
Description
SCRPSNT# Active Phase Control
1: Active high
0: Active low
SCR DIV96M6-0
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IT8702F V0.5
Configuration
8.6
Serial Port 2 Configuration Registers (LDN=02h)
8.6.1
Bit
7-1
0
8.6.2
Bit
7-4
3-0
8.6.3
Bit
7-3
2-0
8.6.4
Bit
7-4
3-0
8.6.5
Bit
7
6-4
3
2-1
0
Serial Port 2 Activate (Index=30h, Default=00h)
Description
Reserved
Serial Port 2 Enable
1: Enabled
0: Disabled
Serial Port 2 Base Address MSB Register (Index=60h, Default=02h)
Description
Read only with “0h” for Base Address [15:12].
Read/write, mapped as Base Address[11:8].
Serial Port 2 Base Address LSB Register (Index=61h, Default=F8h)
Description
Read/write, mapped as Base Address [7:3].
Read only as “000b.”
Serial Port 2 Interrupt Level Select (Index=70h, Default=03h)
Description
Reserved with default “0h.”
Select the interrupt level Note1 for Serial Port 2.
Serial Port 2 Special Configuration Register 1 (Index=F0h, Default=00h)
Description
Reserved
Serial Port 2 Mode Note3
000: Standard (default)
001: IrDA 1.0 (HP SIR)
010 : ASKIR
100 : Smart Card Reader (SCR)
else : Reserved
Reserved with default “0.”
Clock Source
00: 24 MHz/13 (Standard)
01: 24 MHz/12 (MIDI)
10: Reserved
11: Reserved
1: IRQ sharing
0: Normal
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IT8702F V0.5
IT8702F
8.6.6
Bit
7
6
5
4
3
2-0
8.6.7
Serial Port 2 Special Configuration Register 2 (Index=F1h, Default=50h)
Description
1: No transmission delay (40 bits) when the SIR or ASKIR is switched from RX mode to TX mode.
0: Transmission delay (40 bits) when the SIR or ASKIR is switched from RX mode to TX mode.
1: No reception delay (40 bits) when the SIR or ASKIR is switched from TX mode to RX mode.
0: Reception delay (40 bits) when the SIR or ASKIR is switched from TX mode to RX mode.
Single Mask Mode: When set, the RX of UART is masked under TX transmission.
1: Half Duplex (default).
0: Full Duplex.
SIR RX polarity
1: Active low
0: Active high
Reserved
Serial Port 2 Special Configuration Register 3 (Index=F2h, Default=00h)
This register is valid only when Serial Port 2’s Mode is Smart Card Reader.
Bit
7-3
2
1-0
8.6.8
Description
Reserved
SCRPFET# polarity.
1: Active high
0: Active low
SCR_CLKSEL1-0.
00: Stop
01: 3.5 MHz
10: 7.1 MHz
11: Special Divisor ( 96 MHz/DIV96M)
Serial Port 2 Special Configuration Register 4 (Index=F3h, Default=7Fh)
This register is valid only when Serial Port 2’s Mode is Smart Card Reader.
Bit
7
6-0
Description
SCRPSNT# Active Phase Control
1: Active high
0: Active low
SCR DIV96M6-0
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IT8702F V0.5
Configuration
8.7
Parallel Port Configuration Registers (LDN=03h)
8.7.1
Bit
7-1
0
8.7.2
Bit
7-4
3-0
8.7.3
Parallel Port Activate (Index=30h, Default=00h)
Description
Reserved
Parallel Port Enable
1: Enabled
0: Disabled
Parallel Port Primary Base Address MSB Register (Index=60h, Default=03h)
Description
Read only as “0h” for Base Address[15:12]
Read/write, mapped as Base Address[11:8]
Parallel Port Primary Base Address LSB Register (Index=61h, Default=78h)
If the bit 2 is set to 1, the EPP mode is disabled automatically.
Bit
7-2
1-0
8.7.4
Bit
7-4
3-0
8.7.5
Bit
7-2
1-0
8.7.6
Description
Read/write, mapped as Base Address[7:2]
Read only as “00b.”
Parallel Port Secondary Base Address MSB Register (Index=62h, Default=07h)
Description
Read only as “0h” for Base Address[15:12]
Read/write, mapped as Base Address[11:8]
Parallel Port Secondary Base Address LSB Register (Index=63h, Default=78h)
Description
Read/write, mapped as Base Address[7:2]
Read only as “00b.”
Parallel Port Interrupt Level Select (Index =70h, Default=07h)
Bit
Description
7-4
Reserved with default “0h.”
3-0
Select the interrupt level Note1 for Parallel Port
8.7.7 Parallel Port DMA Channel Select (Index=74h, Default=03h)
Bit
7-3
2-0
Description
Reserved with default “00h.”
Select the DMA channel Note2 for Parallel Port.
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IT8702F
8.7.8
Bit
7-4
3
2
1-0
Parallel Port Special Configuration Register (Index=F0h, Default=03h)
Description
Reserved
1: POST Data Port Disable
0: POST Data Port Enable
1: IRQ sharing
0: Normal
Parallel Port Modes
00 : Standard Parallel Port mode (SPP)
01 : EPP mode
10 : ECP mode
11 : EPP mode & ECP mode
If the bit 1 is set, ECP mode is enabled. If the bit 0 is set, EPP mode is enabled. These two bits are
independent. However, according to the EPP spec., when Parallel Port Primary Base Address LSB
Register bit 2 is set to 1, the EPP mode cannot be enabled.
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48
IT8702F V0.5
Configuration
8.8
FAN Controller Configuration Registers (LDN=04h)
8.8.1
Bit
7-1
0
8.8.2
Bit
7-4
3-0
8.8.3
Bit
7-3
2-0
8.8.4
Bit
7-4
3-0
8.8.5
Bit
7-3
2-0
8.8.6
Bit
7-4
3-0
8.8.7
Bit
7
6
5
4
FAN Controller Activate Register (Index=30h, Default=00h)
Description
Reserved
FAN Controller Enable.
1: Enabled
0: Disabled
This is a read/write register.
FAN Controller Base Address MSB Register (Index=60h, Default=02h)
Description
Read only as “0h” for Base Address[15:12].
Read/write, mapped as Base Address[11:8].
FAN Controller Base Address LSB Register (Index=61h, Default=90h)
Description
Read/write, mapped as Base Address[7:3].
Read only as “000b.”
PME Direct Access Base Address MSB Register (Index=62h, Default=02h)
Description
Read only as “0h” for Base Address[15:12]
Read/write, mapped as Base Address[11:8]
PME Direct Access Base Address LSB Register (Index=63h, Default=30h)
Description
Read/write, mapped as Base Address[7:3]
Read only as “000b.”
FAN Controller Interrupt Level Select (Index=70h, Default=09h)
Description
Reserved with default “0h.”
Select the interrupt level Note1 for FAN Controller
APC/PME Event Enable Register (PER) (Index=F0h, Default=00h)
Description
It is set to 1 when VCCH is off. Write 1 to clear this bit. This bit is ineffective if a 0 is written to this
bit.
0: Smart Card Reader card detect event disabled.
1: Smart Card Reader card detect event enabled.
Reserved with default “0h.”
0: PS/2 Mouse event disabled.
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IT8702F V0.5
IT8702F
Bit
3
2
1
0
8.8.8
Bit
7
6
5
4
3
2
1
0
8.8.9
Bit
7
6
5
4
3
2
1
0
Description
1: PS/2 Mouse event enabled.
0: Keyboard event disabled.
1: Keyboard event enabled.
0: RI2# event disabled.
1: RI2# event enabled.
0: RI1# event disabled.
1: RI1# event enabled.
0:CIR event disabled.
1:CIR event enabled.
APC/PME Status Register (PSR) (Index=F1h, Default=00h)
Description
It is set to 1 when VCC is ON at previous AC power failure and 0 when VCC is OFF.
0: No Smart Card Reader card detect event Detected.
1: Smart Card Reader card detect event Detected.
Reserved
0: No PS/2 Mouse Event Detected.
1: PS/2 Mouse Event Detected.
0: No Keyboard Event Detected.
1: Keyboard Event Detected.
0: No RI2# Event Detected.
1: RI2# Event Detected.
0: No RI1# Event Detected.
1: RI1# Event Detected.
0: No CIR event Detected.
1: CIR event Detected.
APC/PME Control Register 1 (PCR 1) (Index=F2h, Default=00h)
Description
PER and PSR normal run access enable
PME# output control
0: Enabled
1: Disabled
This bit is restored automatically to the previous VCC state before power failure occurs
Disables all APC events after the power failure occurs, excluding PANSWH#
Keyboard event mode selection when VCC is ON
1: Determined by PCR 2
0: Pulse falling edge on KCLK
Mouse event when VCC is OFF
1: Click Key twice sequentially
0: Pulse falling edge on MCLK
Mouse event when VCC is ON
1: Click Key twice sequentially
0: Pulse falling edge on MCLK
Reserved
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IT8702F V0.5
Configuration
8.8.10
Bit
7-1
0
8.8.11
Bit
7
6
5
4
3-2
1-0
8.8.12
Bit
7-6
5-0
8.8.13
FAN Controller Special Configuration Register (Index=F3h, Default=00h)
Description
Reserved
1: IRQ sharing.
0: Normal.
APC/PME Control Register 2 (PCR 2) (Index=F4h, Default=00h)
Description
Disable KCLK/KDAT and MCLK/MDAT auto-swap
0: Enabled.
1: Disabled.
Reserved.
PSON# state when VCCH is switched from OFF to ON
0: High-Z (default power OFF).
1: Inverting of PSIN.
Masks PANSWH# power-on event.
Key Number of the Keyboard power-up event
00: 5 (Key string mode), 3 (Stroke keys at same time mode)
01: 4 (Key string mode), 2 (Stroke keys at same time mode)
10: 3 (Key string mode), 1 (Stroke keys at same time mode)
11: 2 (Key string mode), Reserved (Stroke keys at same time mode)
Keyboard power-up event mode selection
00: KCLK falling edge
01: Key string mode
10: Stroke keys at same time mode
11: Reserved
APC/PME Special Code Index Register (Index=F5h)
Description
Reserved (should be “00”).
Indicate which Identification Key Code or CIR code register is to be read/written via 0xF6.
APC/PME Special Code Data Register (Index=F6h)
There are 5 bytes for Key String mode, 3 bytes for Stroke Keys at same time mode and CIR event codes.
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IT8702F
8.9
KBC (keyboard) Configuration Registers (LDN=05h)
8.9.1
Bit
7-1
0
8.9.2
KBC (keyboard) Activate (Index=30h, Default=01h or 00h)
Description
Reserved
KBC (keyboard) Enable
1: Enabled
0: Disabled
This is a read/write register. The default value depends on the state of the DTR1# when
LRESET# is activated. The default value is 1b for the High state of DTR1# when LRESET# is
activated. It is 0b for the low state of DTR1# when LRESET# is activated.
KBC (keyboard) Data Base Address MSB Register (Index=60h, Default=00h)
Bit
Description
7-4
Read only as “0h” for Base Address [15:12].
3-0
Read/write, mapped as Base Address [11:8].
8.9.3 KBC (keyboard) Data Base Address LSB Register (Index=61h, Default=60h)
Bit
7-0
8.9.4
Bit
7-4
3-0
8.9.5
Bit
7-0
8.9.6
Bit
7-4
3-0
Description
Read/write, mapped as Base Address[7:0]
KBC (keyboard) Command Base Address MSB Register (Index=62h, Default=00h)
Description
Read only as “0h” for Base Address[15:12]
Read/write, mapped as Base Address[11:8]
KBC (keyboard) Command Base Address LSB Register (Index=63h, Default=64h)
Description
Read/write, mapped as Base Address[7:0]
KBC (keyboard) Interrupt Level Select (Index=70h, Default=01h)
Description
Reserved with default “0h.”
Select the interrupt level Note1 for KBC (keyboard)
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IT8702F V0.5
Configuration
8.9.7
KBC (keyboard) Interrupt Type (Index=71h, Default=02h)
This register indicates the type of interrupt set for KBC (keyboard) and is read only as “02h” when bit 0 of the
KBC (keyboard) Special Configuration Register is cleared. When bit 0 is set, this type of interrupt can be
selected as level or edge trigger.
Bit
7-2
1
0
8.9.8
Bit
7-5
4
3
2
1
0
8.10
8.10.1
Bit
7-1
0
8.10.2
Bit
7-4
3-0
8.10.3
Description
Reserved
1: High Level
0: Low Level
1: Level Type
0: Edge Type
KBC (keyboard) Special Configuration Register (Index=F0h, Default=00h)
Description
Reserved
1: IRQ sharing.
0: Normal.
1: KBC’s clock 8 MHz.
0: KBC’s clock 12 MHz.
1: Key lock enabled.
0: Key lock disabled.
1: Type of interrupt of KBC (keyboard) can be changed.
0: Type of interrupt of KBC (keyboard) is fixed.
1: Enables the External Access ROM of 8042.
0: Internal built-in ROM is used.
KBC (mouse) Configuration Registers (LDN=06h)
KBC (mouse) Activate (Index=30h, Default=00h)
Description
Reserved
KBC (mouse) Enable
1: Enabled
0: Disabled
KBC (mouse) Interrupt Level Select (Index=70h, Default=0Ch)
Description
Reserved with default “0h.”
Select the interrupt level Note1 for KBC (mouse).
KBC (mouse) Interrupt Type (Index=71h, Default=02h)
This register indicates the type of interrupt used for KBC (mouse) and is read only as “02h” when bit 0 of the
KBC (mouse) Special Configuration Register is cleared. When bit 0 is set, the type of interrupt can be
selected as level or edge trigger.
Bit
7-2
1
Description
Reserved
1: High Level
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IT8702F
Bit
0
8.10.4
Bit
7-2
1
0
Description
0: Low Level
1: Level Type
0: Edge Type
KBC (mouse) Special Configuration Register (Index=F0h, Default=00h)
Description
Reserved with default “00h.”
1: IRQ sharing.
0: Normal.
1: Type of interrupt of KBC (mouse) can be changed.
0: Type of interrupt of KBC (mouse) is fixed.
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IT8702F V0.5
Configuration
8.11
8.11.1
Bit
7-4
3-0
GPIO Configuration Registers (LDN=07h)
SMI# Normal Run Access Base Address MSB Register (Index=60h, Default=00h)
Description
Read only as “0h” for Base Address [15:12].
Read/write, mapped as Base Address [11:8].
8.11.2
SMI# Normal Run Access Base Address LSB Register (Index=61h, Default=00h)
Bit
7-0
8.11.3
Description
Read/write, mapped as Base Address[7:0].
Simple I/O Base Address MSB Register (Index=62h, Default=00h)
Bit
7-4
3-0
8.11.4
Bit
7-0
8.11.5
Bit
7-4
3-0
8.11.6
Bit
7-0
8.11.7
Bit
7-4
3-0
8.11.8
Bit
7
6
5
4
3-2
1
Description
Read only as “0h” for Base Address [15:12].
Read/write, mapped as Base Address [11:8].
Simple I/O Base Address LSB Register (Index=63h, Default=00h)
Description
Read/write, mapped as Base Address[7:0].
Panel Button De-bounce Base Address MSB Register (Index=64h, Default=00h)
Description
Read only as “0h” for Base Address [15:12].
Read/write, mapped as Base Address [11:8].
Panel Button De-bounce Base Address LSB Register (Index=65h, Default=00h)
Description
Read/write, mapped as Base Address[7:0].
Panel Button De-bounce Interrupt Level Select Register (Index=70h, Default=00h)
Description
Reserved
Select the interrupt level Note1 for Panel Button De-bounce.
Watch Dog Timer Control Register (Index=71h, Default=00h)
Description
WDT is reset upon a CIR interrupt
WDT is reset upon a KBC (mouse) interrupt
WDT is reset upon a KBC (keyboard) interrupt
WDT is reset upon a read or a write to the Game Port base address
Reserved
Force Time-out
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IT8702F V0.5
IT8702F
Bit
0
8.11.9
Bit
7
6
5
4
3-0
8.11.10
Bit
7-0
8.11.11
Description
This bit is self-clearing
WDT Status
1: WDT value reaches 0.
0: WDT value is not 0.
Watch Dog Timer Configuration Register (Index=72h, Default=00h)
Description
WDT Time-out value select 1
1: Second
0: Minute
WDT output through KRST (pulse) enable
1: Enable.
0: disable
WDT Time-out value Extra select
1: 64 ms.
0: Determine by WDT Time-out value select 1 (bit 7 of this register).
WDT output through PWROK1/PWROK2 (pulse) enable
1: Enable.
0: disable
Select the interrupt level Note1 for WDT
Watch Dog Timer Time-Out Value Register (Index=73h, Default=00h)
Description
WDT time-out value 7-0
GPIO Pin Set 1, 2, 3, 4 and 5 Polarity Registers (Index=B0h, B1h, B2h, B3h and B4h,
Default=00h)
These registers are used to program the GPIO pin type as polarity inverting or non-inverting.
Bit
7-0
8.11.12
Description
1: Inverting
0: Non-inverting
GPIO Pin Set 1, 2, 3, 4 and 5 Pin Internal Pull-up Enable Registers (Index=B8h, B9h, BAh,
BBh and BCh, Default=00h)
These registers are used to enable the GPIO pin internal pull-up.
Bit
7-0
8.11.13
Description
1: Enabled.
0: Disabled.
Simple I/O Set 1, 2, 3, 4 and 5 Enable Registers (Index=C0h, C1h, C2h, C3h and C4h,
Default=01h, 00h, 00h, 40h, and 00h)
These registers are used to select the function as the Simple I/O function or the Alternate function.
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IT8702F V0.5
Configuration
Bit
7-0
8.11.14
Description
1: Simple I/O function
0: Alternate function
Simple I/O Set 1, 2, 3, 4 and 5 Output Enable Registers (Index=C8h, C9h, CAh, CBh and CCh,
Default=01h, 00h, 00h, 40h, and 00h)
These registers are used to determine the direction of the Simple I/O.
Bit
Description
7-0
0: Input mode
1: Output mode
8.11.15 Panel Button De-bounce Control Register (Index=D0h, Default=00h)
Bit
7-5
4
3
2
1-0
8.11.16
Description
Reserved
IRQ Sharing Enable
IRQ Output Type
IRQ Output Enable
1: Enabled
0: Disabled
De-bounce Time Selection
00: 8 ms (6 ms ignored, 8 ms passed)
01: 16 ms (12 ms ignored, 16 ms passed)
10: 32 ms (24 ms ignored, 32 ms passed)
11: 64 ms (48 ms ignored, 64 ms passed)
Panel Button De-bounce Set 1, 2, 3, 4 and 5 Enable Registers (Index=D1h, D2h, D3h, D4h and
D5h, Default=00h)
These registers are used to enable Panel Button De-bounce for each pin.
Bit
7-0
8.11.17
Description
1: Enabled
0: Disabled
IRQ3-7, 9-12 and 14-15 External Routing Input Pin Mapping Registers (Index=E3h-E7h, E9hECh and EEh-EFh, Default=00h)
These registers are used to determine the external routing input pin mappings of IRQ3-7, 9-12 and 14-15.
Bit
7
6
5-0
8.11.18
Description
Reserved
IRQ Sharing Enable
Input pin Location. Please see Location mapping table Note4
SMI# Control Register 1 (Index=F0h, Default=00h)
Bit
Description
7
Enables the generation of an SMI# due to MIDI’s IRQ (EN_MIDI).
6
Enables the generation of an SMI# due to KBC (Mouse)’s IRQ (EN_MIRQ).
5
Enables the generation of an SMI# due to KBC (Keyboard)’s IRQ (EN_KIRQ).
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IT8702F V0.5
IT8702F
Bit
4
3
2
1
0
8.11.19
Bit
7
6
5-3
2
1
0
8.11.20
Description
Enables the generation of an SMI# due to FAN Controller’s IRQ (EN_ECIRQ).
Enables the generation of an SMI# due to Parallel Port’s IRQ (EN_PIRQ).
Enables the generation of an SMI# due to Serial Port 2’s IRQ (EN_S2IRQ).
Enables the generation of an SMI# due to Serial Port 1’s IRQ (EN_S1IRQ).
Enables the generation of an SMI# due to FDC’s IRQ (EN_FIRQ).
SMI# Control Register 2 (Index=F1h, Default=00h)
Description
Forces to clear all the SMI# status register bits, non-sticky.
0: Edge trigger
1: Level trigger.
Reserved
Enables the generation of an SMI# due to WDT’s IRQ (EN_WDT).
Enables the generation of an SMI# due to CIR’s IRQ (EN_CIR).
Enables the generation of an SMI# due to PBD’s IRQ (EN_PBD).
SMI# Status Register 1 (Index=F2h, Default=00h)
This register is used to read the status of SMI# inputs.
Bit
7
6
5
4
3
2
1
0
8.11.21
Description
MIDI’s IRQ
KBC (PS/2 Mouse)’s IRQ
KBC (Keyboard)’s IRQ
FAN Controller’s IRQ
Parallel Port’s IRQ
Serial Port 2’s IRQ
Serial Port 1’s IRQ
FDC’s IRQ
SMI# Status Register 2 (Index=F3h, Default=00h)
This register is used to read the status of SMI# inputs.
Bit
7-3
2
1
0
8.11.22
Bit
7-6
5-0
Description
Reserved
WDT’s IRQ
CIR’s IRQ
PBD’s IRQ
SMI# Pin Mapping Register (Index=F4h, Default=00h)
Description
Reserved
SMI# Pin Location
Please see Location mapping table Note4.
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IT8702F V0.5
Configuration
8.11.23
Reserved Register (Index=F5h, Default=00h)
8.11.24
Reserved Register (Index=F6h, Default=00h)
8.11.25
Keyboard Lock Pin Mapping Register (Index=F7h, Default=00h)
Bit
7-6
5-0
8.11.26
Bit
7-6
5-0
8.11.27
Bit
7-4
3
2-1
0
8.11.28
Bit
7-6
5-0
8.11.29
Bit
7-4
3
2-1
0
Description
Reserved
Keyboard Lock Pin Location
Please see Location mapping table Note4.
GP LED Blinking 1 Pin Mapping Register (Index=F8h, Default=00h)
Description
Reserved
GP LED Blinking 1 Location
Please see Location mapping table Note4.
GP LED Blinking 1 Control Register (Index=F9h, Default=00h)
Description
Reserved
GP LED Blinking 1 short low pulse enabled
GP LED 1 Frequency Control.
00: 4 Hz
01: 1 Hz
10: 1/4 Hz
11: 1/8 Hz
GP LED Blinking 1 Output low enabled
GP LED Blinking 2 Pin Mapping Register (Index=FAh, Default=00h)
Description
Reserved
GP LED Blinking 2 Location
Please see Location mapping table Note4.
GP LED Blinking 2 Control Register (Index=FBh, Default=00h)
Description
Reserved
GP LED Blinking 2 short low pulse enabled.
GP LED 2 Frequency Control.
00: 4 Hz
01: 1 Hz
10: 1/4 Hz
11: 1/8 Hz
GP LED Blinking 2 Output low enabled.
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IT8702F
8.11.30
Bit
7-6
5-0
8.11.31
Bit
7
6
5-0
VID Input Register (Index=FCh, Default=--h)
Description
Reserved
VID 5-0 inputs
They are read-only. The inputs’ thresholds for VID inputs are not TTL level (0.4V for low, 2.2V for
high), but special CMOS level (1.5V for low, 2.5V for high)
VID Output Register (Index=FDh, Default=00h)
Description
VID_OE. VID output enable
1: output
0: input
Reserved
VID 5-0 output values
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IT8702F V0.5
Configuration
8.12
8.12.1
Bit
7-1
0
8.12.2
Bit
7-4
3-0
8.12.3
Bit
7-3
2-0
8.12.4
Bit
7-4
3-0
8.12.5
Bit
7-1
0
MIDI Port Configuration Registers (LDN=08h)
MIDI Port Activate (Index=30h, Default=00h)
Description
Reserved
MIDI Port Enable
1: Enabled
0: Disabled
MIDI Port Base Address MSB Register (Index=60h, Default=03h)
Description
Read only with “0h” for Base Address[15:12].
Read/write, mapped as Base Address[11:8].
MIDI Port Base Address LSB Register (Index=61h, Default=00h)
Description
Read/write, mapped as Base Address[7:3].
Read only as “000b.”
MIDI Port Interrupt Level Select (Index=70h, Default=0Ah)
Description
Reserved with default “0h.”
Select the interrupt level Note1 for MIDI Port.
MIDI Port Special Configuration Register (Index=F0h, Default=00h)
Description
Reserved with default “00h.”
1: IRQ sharing.
0: Normal.
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IT8702F
8.13
8.13.1
Bit
7-1
0
8.13.2
Bit
7-4
3-0
8.13.3
Bit
7-0
Game Port Configuration Registers (LDN=09h)
Game Port Activate (Index=30h, Default=00h)
Description
Reserved
Game Port Enable
1: Enabled. (If enable, the multi function pin20, 21,22,23 will change to Game port function.)
0: Disabled.
Game Port Base Address MSB Register (Index=60h, Default=02h)
Description
Read only with “0h” for Base Address[15:12].
Read/write, mapped as Base Address[11:8].
Game Port Base Address LSB Register (Index=61h, Default=01h)
Description
Read/write, mapped as Base Address[7:0].
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IT8702F V0.5
Configuration
8.14
8.14.1
Bit
7-1
0
8.14.2
Bit
7-4
3-0
8.14.3
Bit
7-3
2-0
8.14.4
Bit
7-4
3-0
8.14.5
Bit
7-1
0
Consumer IR Configuration Registers (LDN=0Ah)
Consumer IR Activate (Index=30h, Default=00h)
Description
Reserved
Consumer IR Enable
1: Enabled.
0: Disabled.
Consumer IR Base Address MSB Register (Index=60h, Default=03h)
Description
Read only with “0h” for Base Address[15:12].
Read/write, mapped as Base Address[11:8].
Consumer IR Base Address LSB Register (Index=61h, Default=10h)
Description
Read/write, mapped as Base Address[7:3].
Read only as “000b.”
Consumer IR Interrupt Level Select (Index=70h, Default=0Bh)
Description
Reserved with default “0h.”
Select the interrupt level Note1 for Consumer IR.
Consumer IR Special Configuration Register (Index=F0h, Default=00h)
Description
Reserved with default “00h.”
1: IRQ sharing.
0: Normal.
Note 1:
Interrupt level mapping
Fh-Dh: not valid
Ch: IRQ12
3h: IRQ3
2h: not valid
1h: IRQ1
0h: no interrupt selected
Note 2:
DMA channel mapping
7h-5h: not valid
4h: no DMA channel selected
3h: DMA3
2h: DMA2
1h: DMA1
0h: DMA0
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IT8702F V0.5
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Note 3:
Except the standard mode, COM1 and COM2 cannot be selected in the same mode.
Note 4: The Location mapping table
Location
Description
001 000
GP10 (pin 84). Powered by VCCH.
001 001
GP11 (pin 34).
001 010
GP12 (pin 33).
001 011
GP13 (pin 32).
001 100
GP14 (pin 31).
001 101
GP15 (pin 30).
001 110
GP16 (pin 29).
001 111
GP17 (pin 28).
010 000
GP20 (pin 27).
010 001
GP21 (pin 26).
010 010
GP22 (pin 25).
010 011
GP23 (pin 24).
010 100
GP24 (pin 23).
010 101
GP25 (pin 22).
010 110
GP26 (pin 21).
010 111
GP27 (pin 20).
011 000
GP30 (pin 19).
011 001
GP31 (pin 18).
011 010
GP32 (pin 17).
011 011
GP33 (pin 16).
011 100
GP34 (pin 14).
011 101
GP35 (pin 13).
011 110
GP36 (pin 12).
011 111
GP37 (pin 11).
100 000
GP40 (pin 79). Powered by VCCH.
100 001
GP41 (pin 78). Powered by VCCH.
100 010
GP42 (pin 76). Powered by VCCH.
100 011
GP43 (pin 75). Powered by VCCH.
100 100
GP44 (pin 72). Powered by VCCH.
100 101
GP45 (pin 71). Powered by VCCH.
100 110
GP46 (pin 70). Powered by VCCH.
100 111
GP47 (pin 66).
101 000
GP50 (pin 48).
101 001
GP51 (pin 10).
101 010
GP52 (pin 9).
101 011
GP53 (pin 77). Powered by VCCH.
101 100
GP54 (pin 73). Powered by VCCH.
101 101
GP55 (pin 85). Powered by VCCH.
else
Reserved
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64
IT8702F V0.5
Functional Description
9. Functional Description
9.1
LPC Interface
The IT8702F supports the peripheral site of the LPC I/F as described in the LPC Interface Specification
Rev.1.0 (Sept. 29, 1997). In addition to the required signals (LAD3-0, LFRAME#, LRESET#, LCLK (LCLK is
the same as PCICLK.)), the IT8702F also supports LDRQ#, SERIRQ and PME#.
9.1.1
LPC Transactions
The IT8702F supports some parts of the cycle types described in the LPC I/F specification. Memory read and
Memory write cycles are used for the Flash I/F. I/O read and I/O write cycles are used for the programmed
I/O cycles. DMA read and DMA write cycles are used for DMA cycles. All of these cycles are characteristic of
the single byte transfer.
For LPC host I/O read or write transactions, the Super I/O module processes a positive decoding, and the
LPC interface can respond to the result of the current transaction by sending out SYNC values on LAD[3:0]
signals or leave LAD[3:0] tri-state depending on its result.
For DMA read or write transactions, the LPC interface will make reactions according to the DMA requests
from the DMA devices in the Super I/O modules, and decides whether to ignore the current transaction or not.
The FDC and ECP are 8-bit DMA devices, so if the LPC Host initializes a DMA transaction with data size of
16/32 bits, the LPC interface will process the first 8-bit data and response with a SYNC ready (0000b) which
will terminate the DMA burst. The LPC interface will then re-issue another LDRQ# message to assert DREQn
after finishing the current DMA transaction.
9.1.2
LDRQ# Encoding
The Super I/O module provides two DMA devices: the FDC and the ECP. The LPC Interface provides LDRQ#
encoding to reflect the DREQ[3:0] status. Two LDRQ# messages or different DMA channels may be issued
back-to-back to trace DMA requests quickly. But, four PCI clocks will be inserted between two LDRQ#
messages of the same DMA channel to guarantee that there is at least 10 PCI clocks for one DMA request to
change its status. (The LPC host will decode these LDRQ# messages, and send those decoded DREQn to
the legacy DMA controller which runs at 4 MHz or 33/8 MHz).
9.2
Serialized IRQ
The IT8702F follows the specification of Serialized IRQ Support for PCI System, Rev. 6.0, September 1, 1995,
to support the serialized IRQ feature, and is able to interface most PC chipsets. The IT8702F encodes the
parallel interrupts to an SERIRQ which will be decoded by the chipset with built-in Interrupt Controllers (two
8259 compatible modules).
9.2.1
Continuous Mode
When in the Continuous mode, the SIRQ host initiates the Start frame of each SERIRQ sequence after
sending out the Stop frame by itself. (The next Start frame may or may not begin immediately after the turnaround state of current Stop frame.) The SERIRQ is always activated and SIRQ host keeps polling all the
IRQn and system events, even though no IRQn status is changed. The SERIRQ enter the Continuous mode
following a system reset.
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65
IT8702F V0.5
IT8702F
9.2.2
Quiet Mode
In the Quiet mode, when one SIRQ Slave detects its input IRQn/events have been changed, it may initiate
the first clock of Start frame. The SIRQ host can then follow to complete the SERIRQ sequence. In the Quiet
mode, the SERIRQ has no activity following the Stop frame until it is initiated by SIRQ Slave, which implies
low activity = low mode power consumption.
9.2.3
Waveform Samples of SERIRQ Sequence
Start Frame
S/H
H
IRQ0 Frame
R
T
S
R
T
IRQ1 Frame
S
R
T
SMI# Frame
S
R
T
IRQ3 Frame
S
R
T
IRQ4 Frame
S
R
T
PCICLK
SERIRQ
(4/6/8)T
S: Slave drive
H: Host drive
R: Recovery
T: Turn-around
S/H: Slave drive when in Quiet mode, Host drive when in Continuous mode
Figure 9-1. Start Frame Timing
Last Frame
Stop Frame
S
I
R
T
(Quiet)
H
R
T
W
Start Frame
Last Frame
S
S
H
R
Stop Frame
T
H
(Continuous)
R
T
H1
PCICLK
SERIRQ
2 Tclk
3 Tclk
0~n Tclk idle state
S: Slave drive
H: Host drive
0~n T, depends on master
R: Recovery
T: Turn-around
I: Idle
W: Waiting
Figure 9-2. Stop Frame Timing
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66
IT8702F V0.5
Functional Description
9.2.4
SERIRQ Sampling Slot
Slot
Number
IRQn/
Events
1
IRQ0
2
-
2
IRQ1
5
Y
3
SMI#
8
Y
4
IRQ3
11
Y
5
IRQ4
14
Y
6
IRQ5
17
Y
7
IRQ6
20
Y
8
IRQ7
23
Y
9
IRQ8
26
Y
10
IRQ9
29
Y
11
IRQ10
32
Y
12
IRQ11
35
Y
13
IRQ12
38
Y
14
IRQ13
41
-
15
IRQ14
44
Y
16
IRQ15
47
Y
17
IOCHCK#
50
-
18
INTA#
53
-
19
INTB#
56
-
20
INTC#
59
-
21
INTD#
62
-
32:22
Unassigned
95 / 65
-
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#of Clocks IT8702F
Past Start
67
IT8702F V0.5
IT8702F
9.3
General Purpose I/O
The IT8702F provides five sets of flexible I/O control and special functions for the system designers via a set
of multi-functional General Purpose I/O pins (GPIO). The GPIO functions will not be performed unless the
related enable bits of the GPIO Multi-function Pin Selection registers (Index 25h, 26h, 27h, 28h and 29h of
the Global Configuration Registers) are set. The GPIO functions include the simple I/O function and alternate
function, and the function selection is determined by the Simple I/O Enable Registers (LDN=07h, Index=C0h,
C1h, C2h, C3h and C4h).
The Simple I/O function includes a set of registers, which correspond to the GPIO pins. All control bits are
divided into five registers. The accessed I/O ports are programmable and are five consecutive I/O ports (Base
Address+0, Base Address+1, Base Address+2, Base Address+3, Base Address+4). Base Address is
programmed on the registers of GPIO Simple I/O Base Address LSB and MSB registers (LDN=07h,
Index=60h and 61h).
The Alternate Function provides several special functions for users, including Watch Dog Timer, SMI# output
routing, External Interrupt routing, Panel Button De-bounce, Keyboard Lock input routing, LED Blinking,
Thermal output routing, and Beep output routing. The last two are the sub-functions of Hardware Monitor.
The Panel Button De-bounce is an input function. After the panel button de-bounce is enabled, a related
status bit will be set when an active low pulse is detected on the GPIO pin. The status bits will be cleared by
writing 1’s to them. Panel Button De-bounce Interrupt will be issued if any one of the status bit is set.
However, the new setting status will not issue another interrupt unless the previous status bit is cleared
before being set.
The Key Lock function locks the keyboard to inhibit the keyboard interface. The programming method is to
set bit 2 on the register Index F0h of KBC (keyboard) (LDN=5). The pin location mapping, Index F7h must
also be programmed correctly.
The Blinking function provides a low frequency blink output. By connecting to some external components, it
can be used to control a power LED. There are several frequencies that can be selected.
The Watch Dog Timer (WDT) function is constituted by a time counter, a time-out status register, and the
timer reset control logic. The time-out status bit may be mapped to an interrupt or KRST# through the WDT
Configuration register. The WDT has a programmable time-out range from 1 to 255 minutes or 1 to 255
seconds. The units are also programmable, either a minute or a second, via bit7 of the WDT Configuration
register. When the WDT Time-out Value register is set to a non-zero value, the WDT loads the value and
begin counting down from the value. When the value reaches to 0, the WDT status register will be set. There
are many system events that can reload the non-zero value into the WDT, which include a CIR interrupt, a
Keyboard Interrupt, a Mouse Interrupt, or I/O reads/writes to the Game Port base address. The effect on the
WDT for each of the events may be enabled or disabled through bits in the WDT control register. No matter
what value in the time counter is, the host may force a time-out to occur by writing a “1” to the bit 1 of the
WDT Configuration register.
The External Interrupt routing function provides a useful feature for motherboard designers. Through this
function, the parallel interrupts of other on-board devices can be easily re-routed into the Serial IRQ.
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68
IT8702F V0.5
Functional Description
The SMI# is a non-maskable interrupt dedicated to the transparent power management. It consists of
different enabled interrupts generated from each of the functional blocks in the IT8702F. The interrupts are
redirected as the SMI# output via the SMI# Control Register 1 and SMI# Control Register 2. The SMI# Status
Registers 1 and 2 are used to read the status of the SMI input events. All the SMI# Status Register bits can
be cleared when the corresponding source events become invalidated. These bits can also be cleared by
writing 1 to bit 7 of SMI# Control Register 2, whether the events of the corresponding sources are invalidated
or not. The SMI# events can be programmed as pulse mode or level mode whenever an SMI# event occurs.
The logic equation of the SMI# event is described below:
SMI# event = (EN_FIRQ and FIRQ) or (EN_S1IRQ and S1IRQ) or (EN_S2IRQ and S2IRQ) or (EN_PIRQ
and PIRQ) or (EN_EC and EC_SMI) or (EN_PBDIRQ or PBDIRQ).
Thermal Output
1
LED Blinking 1
2
3
LED Blinking 2
4
Beep#
SMI#
5
Simple I/O
Polarity
enable
Simple I/O Register Bit-n
SD-bus
WR#
D-
0
TYPE
1
Output
enable
1
GPIO
PIN
0
RD_
Interrupt
SD-bus
Pull-up
enable
status
De-bounce
enable
De-bounce circuit
Panel Button De-bounce Bit-n
RD_(IDX=64h, 65h)
External IRQ Routing
(Level 3 - 7, 9 - 11, 14-15)
Keyboard lock
Figure 9-3. General Logic of GPIO Function
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69
IT8702F V0.5
IT8702F
9.4
Advanced Power Supply Control and Power Management Event (PME#)
The circuit for advanced power supply control (APC) provides five power-up events, Keyboard, Mouse, CIR,
and Smart Card Reader card detect. When any of these five events is true, PWRON# will perform a low state
until VCC is switched to ON state. The five events include the followings:
1.
2.
3.
4.
Detection of KCLK edge or special pattern of KCLK and KDAT. The special pattern of KCLK means
pressing pre-set key string sequentially, and KDAT means pressing pre-set keys simultaneously
Detection of MCLK edge or special pattern of MCLK and MDAT. The special pattern of MCLK and MDAT
means clicking on any mouse button twice sequentially.
Receiving CIR patterns are matched the previous stored pattern stored at the APC/PME Special Code
Index and Data Register
Detection of the Smart Card Reader Card Detect pulse on the SCRPSNT# input pin
The PANSWH# and PSON# are especially designed for the system. PANSWH# serves as a main power
switch input which is wire-AND to the APC output PWRON#. PSON# is the ATX Power control output, which
is a power-failure gating circuit. The power-failure gating circuit is responsible for gating the PSIN input until
PANSWH# becomes active when the VCCH is switched from OFF to ON.
The power-failure gating circuit can be disabled by setting the APC/PME Control Register 2 (LDN=04h, index
F4h, bit 5). The gating circuit also provides an auto-restore function. When the bit 5 of PCR1 is set, the
previous PSON# state will be restored when the VCCH is switched from OFF to ON.
The Mask PWRON# Activation bit (bit 4 of PCR 1) is used to mask all Power-up events except Switch on
event when the VCCH state is just switched from FAIL to OFF. In other words, when this bit is set and the
power state is switched from FAIL to OFF, the only validated function is PANSWH#.
The PCR2 register is responsible for determining the Keyboard power up events and APC conditions. Bit 4 is
used to mask the PANSWH# power-on event on the PWRON# pin. To enable this bit, the keyboard power-up
event should be enabled and set by (1) pressing pre-set key string sequentially or (2) stroking pre-set keys
simultaneously. The APC/PME# special code index and data registers are used to specify the special key
codes in the special power-up events of (1) pressing pre-set key string sequentially or (2) stroking pre-set
keys simultaneously.
A CIR event is generated if the input CIR RX pattern is the same as the previous stored pattern stored at
PME Special Code Index and Data Registers (LDN=04h, Index=F5h and F6h). The total maximum physical
codes are nineteen bytes (from Index 20h to 32h). The first byte (Index 20h) is used to specify the pattern
length (in bytes). Bits[7:4] are used when VCC is on; and Bits[3:0] when VCC goes OFF. The length
represented in each 4 bits will be incremented by 3 internally as the actual length to be compared. For most
of the CIR protocols, the first several bytes are always the same for each key (or pattern). The differences are
always placed in the last several bytes. Thus, the system designer can program the IT8702F to generate a
CIR PME# event as any keys when VCC is ON and a special key (i.e. POWER-ON) when VCC is OFF.
The Smart Card Reader Card Detect event is used to power on the system when any Integrated Circuit Card
is inserted in the Smart Card Reader. When inserted, a pulse will be generated on the SCRPSNT# input pin.
If the relative enabled bit is enabled, the power-up event will be also generated.
All APC registers (Index=F0h, F2h, F4h, F5h and F6h) are powered by back-up power (VBAT) when VCCH is
OFF.
PME# is used to wake up the system from low-power states (S1-S5). Except the five events of the APC’s,
there will be another events to generate PME#: RI1# and RI2# events. RI1# and RI2# are Ring Indicator of
Modem status at ACPI S1 or S2 state. A falling edge on these pins issues PME# events if the enable bits are
set.
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70
IT8702F V0.5
Functional Description
9.5
FAN Controller
The FAN Controller, built in the IT8702F, includes three FAN Tachometer inputs and three sets of advanced
FAN Speed Controllers. FAN Tachometer inputs are digital inputs with an acceptable input range of 0V to 5V,
and are responsible for measuring the FAN’s Tachometer pulse periods. FAN_TAC1 and FAN_TAC2 include
programmable divisors, and can be used to measure different fan speed ranges. FAN_TAC3 also includes
programmable divisors, but can be used to measure two fan speed ranges only.
9.5.1
Interfaces
LPC Bus: The FAN Controller of the IT8702F decodes two addresses.
Table 9-1. Address Map on the LPC Bus
Registers or Ports
Address
Address register of the FAN Controller
Base+05h
Data register of the FAN Controller
Base+06h
Note 1: The Base Address is determined by the Logical Device configuration registers of the FAN
Controller (LDN=04h, registers index=60h, 61h).
To access a FAN Controller register, the address of the register is written to the address port (Base+05h).
Read or write data from or to that register via data port (Base+06h).
9.5.2
9.5.2.1
Bit
7
6-0
Registers
Address Port (Base+05h, Default=00h):
Description
Outstanding; Read only
This bit is set when a data write is performed to Address Port via the LPC Bus.
Index: Internal Address of RAM and Registers.
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71
IT8702F V0.5
IT8702F
Table 9-2. FAN Controller Registers
Index
R/W
Default
Registers or Action
00h
R/W
18h
Configuration
01h
R
00h
Interrupt Status 1
02h
R
00h
Reserved Register
03h
R
00h
Reserved Register
04h
R/W
00h
SMI# Mask 1
05h
R/W
00h
Reserved Register
06h
R/W
00h
Reserved Register
07h
R/W
00h
Interrupt Mask 1
08h
R/W
00h
Reserved Register
09h
R/W
00h
Reserved Register
0Ah
R
-
0Bh
R/W
09h
Fan Tachometer Divisor Register
0Ch
R/W
00h
Fan Tachometer 16-bit Counter Enable Register
0Dh
R
-
Fan Tachometer 1 Reading Register
0Eh
R
-
Fan Tachometer 2 Reading Register
0Fh
R
-
Fan Tachometer 3 Reading Register
10h
R/W
-
Fan Tachometer 1 Limit Register
11h
R/W
-
Fan Tachometer 2 Limit Register
12h
R/W
-
Fan Tachometer 3 Limit Register
13h
R/W
00h
Fan Controller Main Control Register
14h
R/W
50h
FAN_CTL Control Register
15h
R/W 00h or 40h FAN_CTL1 PWM Control Register
16h
R/W 00h or 40h FAN_CTL2 PWM Control Register
17h
R/W 00h or 40h FAN_CTL3 PWM Control Register
VID Register
18h
R
-
Fan Tachometer 1 Extended Reading Register
19h
R
-
Fan Tachometer 2 Extended Reading Register
1Ah
R
-
Fan Tachometer 3 Extended Reading Register
1Bh
R/W
-
Fan Tachometer 1 Extended Limit Register
1Ch
R/W
-
Fan Tachometer 2 Extended Limit Register
1Dh
R/W
-
Fan Tachometer 3 Extended Limit Register
1E-57h
R
-
Reserved Register
58h
R
90h
59h
R/W
-
5Bh
R
12h
Core ID Register
5Ch
R/W
00h
Beep Event Enable Register
5Dh
R/W
00h
Beep Frequency Divisor of Fan Event Register
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ITE Vendor ID Register
Reserved Register
72
IT8702F V0.5
Functional Description
Index
R/W
Default
5E-5Fh
R/W
00h
Reserved Register
60-7Fh
R/W
-
Reserved Register
80h
R
-
Fan Tachometer 4 Reading LSB Register
81h
R
-
Fan Tachometer 4 Reading MSB Register
82h
R
-
Fan Tachometer 5 Reading LSB Register
83h
R
-
Fan Tachometer 5 Reading MSB Register
84h
R/W
-
Fan Tachometer 4 Limit LSB Register
85h
R/W
-
Fan Tachometer 4 Limit MSB Register
86h
R/W
-
Fan Tachometer 5 Limit LSB Register
87h
R/W
-
Fan Tachometer 5 Limit MSB Register
88h
R/W
00h
FAN_CTL4 PWM Control Register
89h
R/W
00h
FAN_CTL5 PWM Control Register
90-9Fh
R/W
-
9.5.2.2
9.5.2.2.1
Reserved Register
Register Description
Configuration Register (Index=00h, Default=18h)
Bit
7
R/W
R/W
6
5
4
3
R/W
R/W
R
R/W
2
1
0
R/W
R/W
R/W
9.5.2.2.2
Registers or Action
Description
Initialization. A “1” restores all registers to their individual default values, except the
Serial Bus Address register. This bit clears itself when the default value is “0.”
Reserved
COPEN# cleared; Write “1” to clear COPEN#
Read Only, Always “1.”
INT_Clear. A “1” disables the SMI# and IRQ outputs with the contents of interrupt status
bits remain unchanged.
IRQ enables the IRQ Interrupt output
SMI# Enable. A “1” enables the SMI# Interrupt output.
Start. A “1” enables the startup of monitoring operations while a “0” sends the monitoring
operation in the STANDBY mode.
Interrupt Status Register 1 (Index=01h, Default=00h)
Reading this register will clear itself following a read access.
Bit
7-5
4
3
2-0
R/W
R
R
R
R
Description
Reserved
A “1” indicates a Case Open event has occurred.
Reserved
A “1” indicates the FAN_TAC3-1 Count limit has been reached.
9.5.2.2.3
Reserved Register (Index=02h, Default=00h)
9.5.2.2.4
Reserved Register (Index=03h, Default=00h)
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73
IT8702F V0.5
IT8702F
9.5.2.2.5
Bit
7-6
4
3
2-0
SMI# Mask Register 1 (Index=04h, Default=00h)
R/W
R/W
R/W
R/W
R/W
Description
Reserved
A “1” disables the Case Open Intrusion interrupt status bit for SMI#.
Reserved
A “1” disables the FAN_TAC3-1 interrupt status bit for SMI#.
9.5.2.2.6
Reserved Register (Index=05h, Default=00h)
9.5.2.2.7
Reserved Register (Index=06h, Default=00h)
9.5.2.2.8
Interrupt Mask Register 1 (Index=07h, Default=00h)
Bit
7-5
4
3
2-0
9.5.2.2.9
R/W
R/W
R/W
R/W
R/W
Description
Reserved
A “1” disables the Case Open Intrusion interrupt status bit for IRQ.
Reserved
A “1” disables the FAN_TAC3-1 interrupt status bit for IRQ.
Reserved Register (Index=08h, Default=00h)
9.5.2.2.10
Reserved Register (Index=09h, Default=00h)
9.5.2.2.11
VID Register (Index=0Ah)
Bit
7-6
5-0
9.5.2.2.12
R/W
R
Fan Tachometer Divisor Register (Index=0Bh, Default=09h)
Bit
7
6
R/W
R/W
5-3
R/W
2-0
R/W
9.5.2.2.13
Description
Reserved
VID5-0 Inputs
Description
Reserved
FAN_TAC3 Counter Divisor
0: divided by 2
1: divided by 8
FAN_TAC2 Counter Divisor
000: divided by 1
100: divided by 16
001: divided by 2
101: divided by 32
010: divided by 4
110: divided by 64
011: divided by 8
111: divided by 128
FAN_TAC1 Counter Divisor
000: divided by 1
100: divided by 16
001: divided by 2
101: divided by 32
010: divided by 4
110: divided by 64
011: divided by 8
111: divided by 128
Fan Tachometer 16-bit Counter Enable Register (Index=0Ch, Default=00h)
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74
IT8702F V0.5
Functional Description
Bit
7-6
5
R/W
R/W
4
R/W
3
2
R/W
1
R/W
0
R/W
9.5.2.2.14
Bit
7-0
9.5.2.2.15
Bit
7-0
9.5.2.2.16
Reserved
FAN_TAC5 Enable
0: disable
1: enable
FAN_TAC4 Enable
0: disable
1: enable
Reserved
FAN_TAC3, 4, 5 16-bit Counter Divisor Enable
0: disable
1: enable
FAN_TAC2 16-bit Counter Divisor Enable
0: disable
1: enable
FAN_TAC1 16-bit Counter Enable
0: disable
1: enable
Fan Tachometer 1-3 Reading Registers (Index=0Dh-0Fh)
R/W
R
Description
The number of counts of the internal clock per revolution.
Fan Tachometer 1-3 Limit Registers (Index=10h-12h)
R/W
R/W
Description
Limit Value
Fan Controller Main Control Register (Index=13h, Default=00h)
Bit
7
6-4
R/W
R
R/W
3
R/W
2-0
R/W
9.5.2.2.17
Description
Description
Reserved
FAN_TAC3-1 Enable
0: disable
1: enable.
Reserved.
Should write ”0”.
FAN_CTL3-1 Output Mode Selection
0: ON/OFF mode.
FAN_CTL Control Register (Index=14h, Default=50h)
Bit
7
R/W
R/W
6-4
R/W
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Description
FAN_CTL Polarity
0: Active Low.
1: Active High.
PWM base clock select.
000: 48Mhz (PWM Frequency=375Khz).
001: 24Mhz(PWM Frequency=187.5Khz).
010: 12Mhz(PWM Frequency=93.75Khz)
75
IT8702F V0.5
IT8702F
Bit
R/W
3
R/W
2-0
R/W
9.5.2.2.18
Description
011: 8Mhz(PWM Frequency=62.5Khz)
100: 6Mhz(PWM Frequency=46.875Khz)
101: 3Mhz(PWM Frequency=23.43Khz)
110: 1.5Mhz(PWM Frequency=11.7Khz)
111: 0.75Mhz(PWM Frequency=5.86Khz).
PWM Minimum Duty Select
0: 0 %. For a given PWM value, the actual duty is PWM/128 X 100%.
1: 20 %. For a given PWM value (not 00h), the actual duty is (PWM+32)/160 X 100%. If
the given PWM value is 00h, the actual duty will be 0%.
FAN_CTL3-1 ON/OFF Mode Control
These bits are only available when the relative output modes are selected in ON/OFF
mode.
0: OFF.
1: ON.
FAN_CTL1 PWM Control Register (Index=15h, Default=00h or 40h)
This default value of this register is selected by JP5.
Bit
7
R/W
R/W
6-0
R/W
9.5.2.2.19
Description
Reserved.
Should write ”0”.
128 steps of PWM control.
FAN_CTL2 PWM Control Register (Index=16h, Default=00h or 40h)
This default value of this register is selected by JP5.
Bit
7
R/W
R/W
6-0
R/W
9.5.2.2.20
Description
Reserved.
Should write ”0”.
128 steps of PWM control.
FAN_CTL3 PWM Control Register (Index=17h, Default=00h or 40h)
This default value of this register is selected by JP5.
Bit
7
R/W
R/W
6-0
R/W
9.5.2.2.21
Bit
7-0
Description
Reserved.
Should write ”0”.
128 steps of PWM control.
Fan Tachometer 1-3 Extended Reading Registers (Index=18h-1Ah)
R/W
R
Description
The number of counts of the internal clock per revolution. [15:8]
9.5.2.2.22
Fan Tachometer 1-3 Extended Limit Registers (Index=1Bh-1Dh)
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Bit
7-0
9.5.2.2.23
Bit
7-0
9.5.2.2.24
Bit
7-0
9.5.2.2.25
Bit
7-1
0
9.5.2.2.26
Bit
7-4
3-0
9.5.2.2.27
Bit
7-0
9.5.2.2.28
Bit
7-0
9.5.2.2.29
Bit
7-0
9.5.2.2.30
Bit
7-0
9.5.2.2.31
Bit
R/W
R
Description
Limit Value. [15:8]
Vendor ID Register (Index=58h, Default=90h)
R/W
R
Description
ITE Vendor ID. Read Only
Code ID Register (Index=5Bh, Default=12h)
R/W
R
Description
ITE Vendor ID. Read Only
Beep Event Enable Register (Index=5Ch, Default=00h)
R/W
R/W
R/W
Description
Reserved
Enables Beep action when FAN_TACs exceed limit.
Beep Frequency Divisor of Fan Event Register (Index=5Dh, Default=00h)
R/W
R/W
R/W
Description
Tone Divisor. Tone=500/(bits[7:4]+1).
Frequency Divisor. Frequency=10K/(bits[3:0]+1).
Fan Tachometer 4-5 Reading LSB Registers (Index=80h,82h)
R/W
R
Description
The number of counts of the internal clock per revolution.
Fan Tachometer 4-5 Reading MSB Registers (Index=81h,83h)
R/W
R
Description
The number of counts of the internal clock per revolution.
Fan Tachometer 4-5 Limit LSB Registers (Index=84h,86h)
R/W
R/W
Description
Limit Value
Fan Tachometer 4-5 Limit MSB Registers (Index=85h,87h)
R/W
R/W
Description
Limit Value
FAN_CTL4 PWM Control Register (Index=88h, Default=00h)
R/W
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Description
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7
R
6-0
R/W
9.5.2.2.32
FAN_CTL5 PWM Control Register (Index=89h, Default=00h)
Bit
7
R/W
R
6-0
R/W
9.5.3
9.5.3.1
Reserved.
Should write ”0”.
128 steps of PWM control.
Description
Reserved.
Should write ”0”.
128 steps of PWM control.
Operation
Power On RESET and Software RESET
When the system power is first applied, the FAN Controller performs a “power on reset” on the registers
which are returned to default values (due to system hardware reset). Except the function of the Serial Bus
Interface Address register, a software reset (bit 7 of Configuration register) is able to accomplish all the
functions as the hardware reset does.
9.5.3.2
Fan Tachometer
The Fan Tachometer inputs gate a 22.5 kHz clock into an 8-bit or a16-bit counter (maximum count=255 or
65535) for one period of the input signals. Several divisors, located in FAN Divisor Register, are provided for
FAN_TAC1, FAN_TAC2, and FAN_TAC3, and are used to modify the monitoring range. Counts are based on
2 pulses per revolution tachometer output.
RPM = 1.35 X 106 / (Count X Divisor)
The maximum input signal range is from 0 to VCC. The additional application is needed to clamp the input
voltage and current.
9.5.3.3
Interrupt of the FAN Controller
The FAN Controller generates interrupts as a result of each of its Limit registers on FAN monitor. All the
interrupts are indicated in two Interrupt Status Registers. The IRQ and SMI# outputs have individual mask
registers. These two Interrupts can also be enabled/disabled in the Configuration Register. The Interrupt
Status Registers will be reset after being read. When the Interrupt Status Registers are cleared, the Interrupt
lines will also be cleared. When a read operation is completed before the completion of the monitoring loop
sequence, it indicates an Interrupt Status Register has been cleared. Due to slow monitoring sequence, the
FAN Controller needs 1.5 seconds to allow all the FAN Controller Registers to be safely updated between
completed read operations. When the bit 3 of the Configuration Register is set to high, the Interrupt lines are
cleared and the monitoring loop will be stopped. The loop will resume when this bit is cleared.
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Functional Description
9.6
9.6.1
Floppy Disk Controller (FDC)
Introduction
The Floppy Disk Controller provides the interface between a host processor and up to two floppy disk drives.
It integrates a controller and a digital data separator with write precompensation, data rate selection logic,
microprocessor interface, and a set of registers.
The FDC supports data transfer rates of 250 Kbps, 300 Kbps, 500 Kbps, and 1 Mbps. It operates in PC/AT
mode and supports 3-mode type drives. Additionally, the FDC is software compatible with the 82077.
The FDC configuration is handled by software and a set of Configuration registers. Status, Data, and Control
registers facilitate the interface between the host microprocessor and the disk drive, providing information
about the condition and/or state of the FDC. These configuration registers can select the data rate, enable
interrupts, drives, and DMA modes, and indicate errors in the data or operation of the FDC/FDD.
The controller manages data transfers using a set of data transfer and control commands. These commands
are handled in three phases: Command, Execution, and Result. Not all commands utilize all these three
phases.
9.6.2
Reset
The IT8702F device implements both software and hardware reset options for the FDC. Either type of the
resets will reset the FDC, terminating all operations and placing the FDC into an idle state. A reset during a
write to the disk will corrupt the data and the corresponding CRC.
9.6.3
Hardware Reset (LRESET# Pin)
When the FDC receives a LRESET# signal, all registers of the FDC core are cleared (except those
programmed by the SPECIFY command). To exit the reset state, the host must clear the DOR bit.
9.6.4
Software Reset (DOR Reset and DSR Reset)
When the reset bit in the DOR or the DSR is set, all registers of the FDC core are cleared. A reset performed
by setting the reset bit in the DOR has higher priority over a reset performed by setting the reset bit in the
DSR. In addition, to exit the reset state, the DSR bit is self-clearing, while the host must clear the DOR bit.
9.6.5
Digital Data Separator
The internal digital data separator is comprised of a digital PLL and associated support circuitry. It is
responsible for synchronizing the raw data signal read from the floppy disk drive. The synchronized signal is
used to separate the encoded clock from the data pulses.
9.6.6
Write Precompensation
Write precompensation is a method that can be used to adjust the effects of bit shift on data as it is written to
the disk. It is harder for the data separator to read data that has been subject to bit shifting. Soft read errors
can occur due to such bit shifting. Write precompensation predicts where the bit shifting might occur within a
data pattern and shifts the individual data bits back to their nominal positions.
The FDC permits the selection of write precompensation via the Data Rate Select Register (DSR) bits 2
through 4.
9.6.7
Data Rate Selection
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Selecting one of the four possible data rates for the attached floppy disks is accomplished by setting the
Diskette Control Register (DCR) or Data Rate Select Register (DSR) bits to 0 and 1. The data rate is
determined by the last value that is written to either the DCR or the DSR. When the data rate is set, the data
separator clock is scaled appropriately.
9.6.8
9.6.8.1
Status, Data and Control Registers
Digital Output Register (DOR, FDC Base Address + 02h)
This is a read/write register. It controls drive selection and motor enables as well as a software reset bit and
DMA enable. The I/O interface reset may be used at any time to clear the DOR’s contents.
Table 9-3. Digital Output Register (DOR)
Bit
7-6
5
Symbol
MOTB EN
4
MOTA EN
3
DMAEN
2
RESET#
1
0
DVSEL
9.6.8.2
Description
Reserved
Drive B Motor Enable
0: Disable Drive B motor.
1: Enable Drive B motor.
Drive A Motor Enable
0: Disable Drive A motor.
1: Enable Drive A motor.
Disk Interrupt and DMA Enable
0: Disable disk interrupt and DMA (DRQx, DACKx#, TC and INTx).
1: Enable disk interrupt and DMA.
FDC Function Reset
0: Reset FDC function.
1: Clear reset of FDC function.
This reset does not affect the DSR, DCR or DOR.
Reserved
Drive Selection
0: Select Drive A.
1: Select Drive B.
Tape Drive Register (TDR, FDC Base Address + 03h)
This is a read/write register and is included for 82077 software compatibility. The contents of this register are
not used internal to the device.
Table 9-4. Tape Drive Register (TDR)
Bit
7-2
1-0
9.6.8.3
Symbol
Undefined
TP_SEL[1:0] Tape Drive Selection
TP_SEL[1:0] : Drive selected.
00: None
01: 1
10: 2
11: 3
Description
Main Status Register (MSR, FDC Base Address + 04h)
This is a read only register. It indicates the general status of the FDC, and is able to receive data from the
host. The MSR should be read before each byte is sent to or received from the Data register, except when in
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Functional Description
DMA mode.
Table 9-5. Main Status Register (MSR)
Bit
7
Symbol
RQM
6
DIO
5
NDM
4
CB
3-2
1
DBB
0
DAB
9.6.8.4
Description
Request for Master
FDC Request for Master.
0: The FDC is busy and cannot receive data from the host.
1: The FDC is ready and the host can transfer data.
Data I/O Direction
Indicates the direction of data transfer once a RQM has been set.
0: Write.
1: Read.
Non-DMA Mode
This bit selects Non-DMA mode of operation.
0: DMA mode selected.
1: Non-DMA mode selected.
This mode is selected via the SPECIFY command during the Execution phase of a
command.
Diskette Control Busy
Indicates whether a command is in progress (the FDD is busy).
0: A command has been executed and the end of the Result phase has been
reached.
1: A command is being executed.
Reserved
Drive B Busy
Indicates whether Drive B is in the SEEK portion of a command.
0: Not busy.
1: Busy.
Drive A Busy
Indicates whether Drive A is in the SEEK portion of a command.
0: Not busy.
1: Busy.
Data Rate Select Register (DSR, FDC Base Address + 04h)
This is a write only register. It is used to determine the data rate, amount of write precompensation, power
down mode, and software reset. The data rate of the floppy disk controller is the most recent write of either
the DSR or DCR. The DSR is unaffected by a software reset. The DSR can be set to 02h by a hardware reset.
The “02h” represents the default precompensation, and 250 Kbps indicates the data transfer rate.
Table 9-6. Data Rate Select Register (DSR)
Bit
7
6
5
Symbol
Description
S/W RESET Software Reset
It is active high and shares the same function with the RESET# of the DOR except
that this bit is self-clearing.
POWER
Power Down
DOWN
When this bit is written with a “1”, the floppy controller is put into manual low power
mode. The clocks of the floppy controller and data separator circuits will be turned
off until a software reset or the Data Register or Main Status Register is accessed.
Undefined
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Bit
4-2
Symbol
Description
PRE-COMP Precompensation Select
2-0
These three bits are used to determine the value of write precompensation that will
be applied to the WDATA# pin. Track 0 is the default starting track number, which
can be changed by the CONFIGURE command for precompensation.
PRE_COMP
111
001
010
011
100
101
110
000
Precompensation
Delay
0.0 ns
41.7 ns
83.3 ns
125.0 ns
166.7 ns
208.3 ns
250.0 ns
Default
Default Precompensation Delays
Data Rate
Precompensation
Delay
1 Mbps
41.7 ns
500 Kbps
125.0 ns
300 Kbps
125.0 ns
250 Kbps
125.0 ns
1-0
DRATE1-0
Data Rate Select
Bits 1-0
00
01
10
11
9.6.8.5
Data Transfer Rate
500 Kbps
300 Kbps
250 Kbps (default)
1 Mbps
Data Register (FIFO, FDC Base Address + 05h)
This is an 8-bit read/write register. It transfers command information, diskette drive status information, and
the result phase status between the host and the FDC. The FIFO consists of several registers in a stack.
Only one register in the stack is permitted to transfer information or status to the data bus at a time.
Table 9-7. Data Register (FIFO)
Bit
7-0
9.6.8.6
Symbol
Description
Data
Command information, diskette drive status, or result phase status data
Digital Input Register (DIR, FDC Base Address + 07h)
This is a read only register and shares this address with the Diskette Control Register (DCR).
Table 9-8. Digital Input Register (DIR)
Bit
7
Symbol
DSKCHG
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Description
Diskette Change
Indicates the inverting value of the bit monitored from the input of the Floppy Disk
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Bit
Symbol
6-0
-
9.6.8.7
Description
Change pin (DSKCHG#).
Undefined
Diskette Control Register (DCR, FDC Base Address + 07h)
This is a write only register and shares this address with the Digital Input Register (DIR).
The DCR register controls the data transfer rate for the FDC.
Table 9-9. Diskette Control Register (DCR)
Bit
7-2
Symbol
-
1-0
DRATE1-0
9.6.9
Description
Reserved.
Always 0
Data Rate Select
Bits 1-0
Data Transfer Rate
00
500 Kbps
01
300 Kbps
10
250 Kbps
11
1 Mbps
Controller Phases
The FDC handles data transfers and control commands in three phases: Command, Execution and Result.
Not all commands utilize these three phases.
9.6.9.1
Command Phase
Upon reset, the FDC enters the Command phase and is ready to receive commands from the host. The host
must verify that MSR bit 7 (RQM) = 1 and MSR bit 6 (DIO) = 0, indicating the FDC is ready to receive data.
For each command, a defined set of command code and parameter bytes must be transferred to the FDC in
a given order. See sections 11.6.11 and 11.6.12 for details on the various commands. RQM is set false (0)
after each byte-Read cycle, and set true (1) when a new parameter byte is required. The Command phase is
completed when this set of bytes has been received by the FDC. The FDC automatically enters the next
controller phase and the FIFO is disabled.
9.6.9.2
Execution Phase
Upon the completion of the Command phase, the FDC enters the Execution phase. It is in this phase that all
data transfers occur between the host and the FDC. The SPECIFY command indicates whether this data
transfer occurs in DMA or non-DMA mode. Each data byte is transferred via an IRQx or DRQx# based upon
the DMA mode. On reset, the CONFIGURE command can automatically enable or disable the FIFO. The
Execution phase is completed when all data bytes have been received. If the command executed does not
require a Result phase, the FDC is ready to receive the next command.
9.6.9.3
Result Phase
For commands that require data written to the FIFO, the FDC enters the Result phase when the IRQ or DRQ
is activated. The MSR bit 7 (RQM) and MSR bit 6 (DIO) must equal 1 to read the data bytes. The Result
phase is completed when the host has read each of the defined set of result bytes for the given command.
Right after the completion of the phase, RQM is set to 1, DIO is set to 0, and the MSR bit 4 (CB) is cleared,
indicating the FDC is ready to receive the next command.
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9.6.9.4
Result Phase Status Registers
For commands that contain a Result phase, these read only registers indicate the status of the most recently
executed command.
Table 9-10. Status Register 0 (ST0)
Bit
7-6
Symbol
IC
5
SE
4
EC
3
2
NU
H
1
0
DSB
DSA
Description
Interrupt Code
00: Execution of the command has been completed correctly.
01: Execution of the command began, but failed to complete successfully.
10: INVALID command.
11: Execution of the command was not completed correctly, due to a polling error.
Seek End
The FDC executed a SEEK or RE-CALIBRATE command.
Equipment Check
The TRK0# pin was not set after a RE-CALIBRATE command was issued.
Not Used
Head Address
The current head address.
Drive B Select
Drive A Select
Table 9-11. Status Register 1 (ST1)
Bit
7
Symbol
EN
6
5
NU
DE
4
OR
3
2
NU
ND
1
NW
0
MA
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Description
End of Cylinder
Indicates the FDC attempted to access a sector beyond the final sector of the track.
This bit will be set if the Terminal Count (TC) signal is not issued after a READ
DATA or WRITE DATA command.
Not Used
Data Error
A CRC error occurred in either the ID field or the data field of a sector.
Overrun/ Underrun
An overrun on a READ operation or underrun on a WRITE operation occurs when
the FDC is not serviced by the CPU or DMA within the required time interval.
Not Used
No Data
No data are available to the FDC when either of the following conditions is met:
The floppy disk cannot find the indicated sector while the READ DATA or READ
DELETED DATA commands are executed
While executing a READ ID command, an error occurs upon reading the ID field
While executing a READ A TRACK command, the FDC cannot find the starting
sector
Not Writeable
Set when a WRITE DATA, WRITE DELETED DATA, or FORMAT A TRACK
command is being executed on a write-protected diskette.
Missing Address Mark
This flag bit is set when either of the following conditions is met:
The FDC cannot find a Data Address Mark or a Deleted Data Address Mark on the
specified track.
The FDC cannot find any ID address on the specified track after two index pulses
are detected from the INDEX# pin.
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Table 9-12. Status Register 2 (ST2)
Bit
7
6
Symbol
NU
CM
5
DD
4
WC
3
SH
2
SN
1
BC
0
MD
Description
Not Used
Control Mark
This flag bit is set when either of the following conditions is met:
1. The FDC finds a Deleted Data Address Mark during a READ DATA command
2. The FDC finds a Data Address Mark during a READ DELETED DATA command
Data Error in Data Field
This flag bit is set when a CRC error is found in the data field.
Wrong Cylinder
This flag bit is set when the track address in the ID field is different from the track
address specified in the FDC.
Scan Equal Hit
This flag bit is set when the condition of "equal" is satisfied during a SCAN
command.
Scan Not Satisfied
This flag bit is set when the FDC cannot find a sector on the cylinder during a SCAN
command.
Bad Cylinder
This flag bit is set when the track address equals “FFh” and is different from the
track address in the FDC.
Missing Data Address Mark
This flag bit is set when the FDC cannot find a Data Address Mark or Deleted Data
Address Mark.
Table 9-13. Status Register 3 (ST3)
Bit
7
Symbol
FT
6
WP
5
RDY
4
TK0
3
TS
2
HD
1-0
US1, US0
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Description
Fault
Indicates the current status of the Fault signal from the FDD.
Write Protect
Indicates the current status of the Write Protect signal from the FDD.
Ready
Indicates the current status of the Ready signal from the FDD.
Track 0
Indicates the current status of the Track 0 signal from the FDD.
Two Side
Indicates the current status of the Two Side signal from the FDD.
Head Address
Indicates the current status of the Head Select signal to the FDD.
Unit Select
Indicates the current status of the Unit Select signals to the FDD.
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9.6.10
Command Set
The FDC utilizes a defined set of commands to communicate with the host. Each command is comprised of a
unique first byte, which contains the op-code, and a series of additional bytes, which contain the required set
of parameters and results. The descriptions use a common set of parameter byte symbols, which are
presented in Table 10-14. The FDC commands may be executed whenever the FDC is in the Command
phase. The FDC checks to see that the first byte is a valid command and, if so, proceeds. An interrupt is
issued if it is not a valid command.
Table 9-14. Command Set Symbol Descriptions
Symbol
C
Description
Cylinder Number
The current/selected cylinder (track) number: 0 − 255.
D
Data
The data pattern to be written into a sector.
DC3−DC0 Drive Configuration Bit3-0
Designate which drives are perpendicular drives on the PERPENDICULAR MODE command.
DIR
Direction Control
Read/Write Head Step Direction Control. 0 = Step Out; 1 = Step In.
DR0, DR1 Disk Drive Select
The selected drive number: 0 or 1.
DTL
Data Length
When N is defined as 00h, DTL designates the number of data bytes which users are going to
read out or write into the Sector. When N is not 00h, DTL is undefined.
DFIFO
Disable FIFO
A “1” will disable the FIFO (default). A “0” will enable the FIFO.
EC
Enable Count
If EC=1, DTL of VERIFY command will be SC.
EIS
Enable Implied Seek
If EIS=1, a SEEK operation will be performed before executing any READ or WRITE command
that requires the C parameter.
EOT
End of Track
The final sector number on a cylinder. During a READ or WRITE operation, the FDC stops data
transfer after the sector number is equal to EOT.
GAP2
Gap 2 Length
By PERPENDICULAR MODE command, this parameter changes Gap 2 length in the format.
GPL
Gap Length
The length of Gap 3. During a FORMAT command, it determines the size of Gap 3.
H
Head Address
The Head number 0 or 1, as specified in the sector ID field. (H = HD in all command words.)
HD
Head
The selected Head number 0 or 1. Also controls the polarity of HDSEL#. (H = HD in all command
words.)
HLT
Head Load Time
The Head Load Time in the FDD (2 to 254 ms in 2 ms increments).
HUT
Head Unload Time
The Head Unload Time after a READ or WRITE operation has been executed (16 to 240 ms in
16 ms increments).
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Functional Description
Command Set Symbol Descriptions [cont’d]
Symbol
LOCK
MFM
MT
N
NCN
ND
OW
PCN
POLLD
PRETRK
R
RCN
SC
SK
SRT
Description
If LOCK=1, DFIFO, FIFOTHR, and PRETRK parameters of the CONFIGURE command will not
be affected by a software reset. If LOCK=0 (default), the above parameters will be set to their
default values following a software reset.
FM or MFM Mode
If MFM is low, FM Mode (single density) is selected. If MFM is high, MFM Mode (double density)
is selected.
Multi-Track
If MT is high, a Multi-Track operation is to be performed. In this mode, the FDC will automatically
start searching for sector 1 on side 1 after finishing a READ/WRITE operation on the last sector
on side 0.
Number
The number of data bytes written into a sector, where:
00: 128 bytes (PC standard)
01: 256 bytes
02: 512 bytes
…
07: 16 Kbytes
New Cylinder Number
A new cylinder number, which is to be reached as a result of the SEEK operation. Desired
position of Head.
Non-DMA Mode
When ND is high, the FDC operates in the Non-DMA Mode.
Overwrite
If OW=1, DC3-0 of the PERPENDICULAR MODE command can be modified. Otherwise, those
bits cannot be changed.
Present Cylinder Number
The cylinder number at the completion of a SENSE INTERRUPT STATUS command. Position of
Head at present time.
Polling Disable
If POLLD=1, the internal polling routine is disabled.
Precompensation Starting Track Number
Programmable from track 0 –255.
Record
The sector number, which will be read or written.
Relative Cylinder Number
To determine the relative cylinder offset from present cylinder as used by the RELATIVE SEEK
command.
The number of sectors per cylinder.
Skip
If SK=1, the Read Data operation will skip sectors with a Deleted Data Address Mark. Otherwise,
the Read Deleted Data operation only accesses sectors with a Deleted Data Address Mark.
Step Rate Time
The Stepping Rate for the FDD (1 to 16 ms in 1 ms increments). Stepping Rate applies to all
drives (F=1 ms, E=2 ms, etc.).
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Command Set Symbol Descriptions [cont’d]
Symbol
ST0
ST1
ST2
ST3
STP
Description
Status 0
Status 1
Status 2
Status 3
ST0−3 stand for one of four registers that store the status information after a command has been
executed. This information is available during the Result phase after command execution. These
registers should not be confused with the Main Status Register (selected by A0 = 0). ST0−3 may
be read only after a command has been executed and contain information associated with that
particular command.
If STP = 1 during a SCAN operation, the data in contiguous sectors are compared byte by byte
with data sent from the processor (or DMA). If STP = 2, alternate sectors are read and
compared.
Table 9-15. Command Set Summary
Phase R/W
Command
READ DATA
Data Bus
D4
D3
D2
D1
D7
D6
D5
W
MT
MFM
SK
0
0
1
1
0
W
0
0
0
0
0
HDS
DR1
DR0
W
C
W
H
W
R
W
N
W
EOT
W
GPL
W
DTL
R
ST0
R
ST1
R
ST2
R
C
R
H
R
R
R
N
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Remarks
Command Codes
Sector ID information before the
command execution
Execution
Result
D0
Data transfer between the FDD and
the main system
Status information after command
execution
Sector ID information after command
execution
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Functional Description
Phase R/W
Command
READ DELETED DATA
Data Bus
D4
D3
D2
D1
D7
D6
D5
W
MT
MFM
SK
0
1
1
0
0
W
0
0
0
0
0
HDS
DR1
DR0
W
C
W
H
W
R
W
N
W
EOT
W
GPL
W
DTL
D0
R
ST0
R
ST1
R
ST2
R
C
R
H
R
R
R
N
Phase R/W
Command
Data transfer between the FDD and
the main system
Status information after command
execution
Sector ID information after command
execution
READ A TRACK
Data Bus
D4
D3
D2
D1
D7
D6
D5
W
0
MFM
0
0
0
0
1
0
W
0
0
0
0
0
HDS
DR1
DR0
W
C
W
H
W
R
W
N
W
EOT
W
GPL
W
DTL
R
ST0
R
ST1
R
ST2
R
C
R
H
R
R
R
N
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D0
Remarks
Command Codes
Sector ID information before the
command execution
Execution
Result
Command Codes
Sector ID information before the
command execution
Execution
Result
Remarks
Data transfer between the FDD and
main system cylinder's contents from
index hole to EOT
Status information after command
execution
Sector ID information after command
execution
89
IT8702F V0.5
IT8702F
Phase R/W
Command
WRITE DATA
Data Bus
D4
D3
D2
D1
D7
D6
D5
W
MT
MFM
0
0
0
1
0
1
W
0
0
0
0
0
HDS
DR1
DR0
W
C
W
H
W
R
W
N
W
EOT
W
GPL
W
DTL
D0
R
ST0
R
ST1
R
ST2
R
C
R
H
R
R
R
N
Phase R/W
Command
Data transfer between the FDD and
the main system
Status information after command
execution
Sector ID information after command
execution
WRITE DELETED DATA
Data Bus
D4
D3
D2
D1
D7
D6
D5
W
MT
MFM
0
0
W
0
0
0
0
W
C
W
H
W
R
W
N
W
EOT
W
GPL
W
DTL
R
ST0
R
ST1
R
ST2
R
C
R
H
R
R
R
N
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D0
1
0
0
1
0
HDS
DR1
DR0
Remarks
Command Codes
Sector ID information before the
command execution
Execution
Result
Command Codes
Sector ID information before the
command execution
Execution
Result
Remarks
Data transfer between the FDD and
the main system
Status information after command
execution
Sector ID information after command
execution
90
IT8702F V0.5
Functional Description
Phase R/W
Command
Execution
Result
D7
D6
D5
W
0
MFM
0
0
1
1
0
1
W
0
0
0
0
0
HDS
DR1
DR0
W
N
W
SC
W
GPL
W
D
W
W
W
W
R
C
H
R
N
ST0
R
ST1
Gap 3
Filler Byte
Input Sector Parameters per-sector
FDC formats an entire cylinder
Status information after command
execution
ST2
Undefined
R
Undefined
R
Undefined
R
Undefined
SCAN EQUAL
Data Bus
D4
D3
D2
D1
D7
D6
D5
W
MT
MFM
SK
1
0
0
0
1
W
0
0
0
0
0
HDS
DR1
DR0
C
W
H
W
R
W
N
W
EOT
W
GPL
W
DTL
R
ST0
R
ST1
R
ST2
R
C
R
H
R
R
R
N
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D0
Remarks
Command Codes
Sector ID information before the
command execution
Execution
Result
Command Codes
Sectors/Cylinder
R
W
Remarks
D0
Bytes/Sector
R
Phase R/W
Command
FORMAT A TRACK
Data Bus
D4
D3
D2
D1
Data transferred from the system to
controller is compared to data read
from disk
Status information after command
execution
Sector ID information after command
execution
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IT8702F
Phase R/W
Command
SCAN LOW OR EQUAL
Data Bus
D4
D3
D2
D1
D7
D6
D5
W
MT
MFM
SK
1
1
0
0
1
W
0
0
0
0
0
HDS
DR1
DR0
W
C
W
H
W
R
W
N
W
EOT
W
GPL
W
DTL
D0
R
ST0
R
ST1
R
ST2
R
C
R
H
R
R
R
N
Phase R/W
Command
Data transferred from the system to
controller is compared to data read
from disk
Status information after command
execution
Sector ID information after command
execution
SCAN HIGH OR EQUAL
Data Bus
D4
D3
D2
D1
D7
D6
D5
W
MT
MFM
SK
1
W
0
0
0
0
W
C
W
H
W
R
W
N
W
EOT
W
GPL
W
DTL
R
ST0
R
ST1
R
ST2
R
C
R
H
R
R
R
N
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D0
1
1
0
1
0
HDS
DR1
DR0
Remarks
Command Codes
Sector ID information before the
command execution
Execution
Result
Command Codes
Sector ID information before the
command execution
Execution
Result
Remarks
Data transferred from the system to
controller is compared to data read
from disk
Status information after command
execution
Sector ID information after command
execution
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IT8702F V0.5
Functional Description
VERIFY
Phase R/W
Command
Data Bus
D4
D3
D7
D6
D5
W
MT
MFM
SK
1
W
EC
0
0
0
W
C
W
H
W
R
W
N
W
EOT
D2
D1
D0
0
1
1
0
0
HDS
DR1
DR0
W
GPL
W
DTL/SC
No data transfer takes place
R
ST0
R
ST1
R
ST2
R
C
R
H
R
R
R
N
Phase R/W
Command
Status information after command
execution
Sector ID information after command
execution
READ ID
Data Bus
D4
D3
D2
D7
D6
D5
W
0
MFM
0
0
1
W
0
0
0
0
0
D1
D0
0
1
0
HDS
DR1
DR0
Execution
Result
R
ST0
R
ST1
R
ST2
R
C
R
H
R
R
R
N
Phase R/W
Command
Command Codes
Sector ID information before the
command execution
Execution
Result
Remarks
Remarks
Command Codes
The first correct ID information on the
Cylinder is stored in the Data Register
Status information after command
execution
Sector ID information during execution
phase
CONFIGURE
Data Bus
D4
D3
D2
D1
D7
D6
D5
W
0
0
0
1
0
0
1
1
W
0
0
0
0
0
0
0
0
W
0
EIS
DFIFO POLLD
D0
Remarks
Configure Information
FIFOTHR
PRETRK
Execution
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IT8702F V0.5
IT8702F
Phase R/W
Command
RE-CALIBRATE
Data Bus
D4
D3
D2
D1
D7
D6
D5
D0
W
0
0
0
0
0
1
1
1
W
0
0
0
0
0
0
DR1
DR0
Execution
Remarks
Command Codes
Head retracted to Track 0
SEEK
Phase R/W
Command
Data Bus
D4
D3
D7
D6
D5
W
0
0
0
0
W
0
0
0
0
W
D2
D1
D0
1
1
1
1
0
HDS
DR1
DR0
Head is positioned over proper
cylinder on diskette
Phase R/W
RELATIVE SEEK
Data Bus
D4
D3
D2
D1
D7
D6
D5
W
1
DIR
0
0
W
0
0
0
0
W
D0
1
1
1
1
0
HDS
DR1
DR0
Command Codes
Head is stepped in or out a
programmable number of tracks
Phase R/W
W
D7
D6
D5
0
0
0
DUMPREG
Data Bus
D4
D3
D2
0
1
1
D1
D0
1
0
Execution
Result
Remarks
RCN
Execution
Command
Command Codes
NCN
Execution
Command
Remarks
Remarks
Command Codes
Registers placed in FIFO
R
PCN-Drive 0
R
PCN-Drive 1
R
PCN-Drive 2
R
PCN-Drive 3
R
SRT
HUT
R
R
R
R
R
HLT
ND
SC/EOT
LOCK
0
0
DIS
DC3
DC2
DC1
DFIFO POLLD
PRETRK
DC0
GAP
FIFOTHR
WG
LOCK
Phase R/W
D7
D6
D5
Data Bus
D4
D3
D2
D1
D0
Command
W
LOCK
0
0
1
0
1
0
0
Result
R
0
0
0
LOCK
0
0
0
0
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94
Remarks
Command Codes
IT8702F V0.5
Functional Description
Phase R/W
D7
D6
D5
VERSION
Data Bus
D4
D3
D2
D1
D0
Remarks
Command
W
0
0
0
1
0
0
0
0
Command Codes
Result
R
1
0
0
1
0
0
0
0
Enhanced Controller
Phase R/W
D7
D6
D5
0
0
0
SENSE INTERRUPT STATUS
Data Bus
D4
D3
D2
D1
D0
Command
W
Result
R
ST0
R
PCN
Phase R/W
Command
Result
0
0
0
SENSE DRIVE STATUS
Data Bus
D4
D3
D2
D1
D5
W
0
0
0
0
0
1
0
0
W
0
0
0
0
0
HDS
DR1
DR0
R
D0
ST3
W
D7
D6
D5
0
0
0
0
0
SRT
D1
D0
1
1
HLT
ND
PERPENDICULAR MODE
Data Bus
D4
D3
D2
D1
D0
D7
D6
D5
W
0
0
0
1
0
0
1
0
W
OW
0
DC3
DC2
DC1
DC0
GAP
WG
D1
D0
Phase R/W
Command
W
Result
R
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D7
D6
Command Codes
Remarks
Command Codes
HUT
W
Phase R/W
Remarks
Status information about FDD
SPECIFY
Data Bus
D4
D3
D2
0
Command Codes
Status information at the end of each
SEEK operation
D6
W
Command
1
D7
Phase R/W
Command
0
Remarks
D5
INVALID
Data Bus
D4
D3
D2
Invalid codes
ST0
95
Remarks
Command Codes
Remarks
INVALID Command Codes (NO-OP:
FDC goes into standby state)
ST0 = 80h
IT8702F V0.5
IT8702F
9.6.11
Data Transfer Commands
All data transfer commands utilize the same parameter bytes (except for FORMAT A TRACK command) and
return the same result data bytes. The only difference between them is the five bits (bit 0−bit 4) of the first
byte.
9.6.11.1 Read Data
The READ DATA command contains nine command bytes that place the FDC into the Read Data mode.
Each READ operation is initialized by a READ DATA command. The FDC locates the sector to be read by
matching ID Address Marks and ID fields from the command with the information on the diskette. The FDC
then transfers the data to the FIFO. When the data from the given sector have been read, the READ DATA
command is completed and the sector address is automatically incremented by 1. The data from the next
sector are read and transferred to the FIFO in the same manner. Such a continuous read function is called a
"Multi-Sector Read Operation".
If a TC or an implied TC (FIFO overrun/underrun) is received, the FDC stops sending data, but continues to
read data from the current sector and checks the CRC bytes until the end of the sector is reached and the
READ operation is completed.
The sector size is determined by the N parameter value as calculated in the equation below:
(7+N value)
Sector Size = 2
bytes.
The DTL parameter determines the number of bytes to be transferred. Therefore, if N = 00h, setting the
sector size to 128 and the DTL parameter value is less than this, the remaining bytes will be read and
checked for CRC errors by the FDC. If this occurs in a WRITE operation, the remaining bytes will be filled
with 0. If the sector size is not 128 (N > 00h), DTL should be set to FFh.
In addition to performing Multi-Sector Read operations, the FDC can also perform Multi-Track Read
operations. When the MT parameter is set, the FDC can read both sides of a disk automatically.
The combination of N and MT parameter values determines the amount of data that can be transferred during
either type of READ operation. Table 9-16 shows the maximum data transfer capacity and the final sector the
FDC reads based on these parameters.
Table 9-16. Effects of MT and N Bits
MT
N
0
1
256 X 26 = 6656
26 on side 0 or side 1
1
1
256 X 52 = 13312
26 on side 1
0
2
512 X 15 = 7680
15 on side 0 or side 1
1
2
512 X 30 = 15360
15 on side 1
0
3
1024 X 8 = 8192
8 on side 0 or side 1
1
3
1024 X16 =16384
16 on side 1
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Maximum Data Transfer Capacity
96
Final Sector Read from Disk
IT8702F V0.5
Functional Description
9.6.11.2 Read Deleted Data
The READ DELETED DATA command is the same as the READ DATA command, except that a Deleted
Data Address Mark (as opposed to a Data Address Mark) is read at the beginning of the Data Field. This
command is typically used to mark a bad sector on a diskette.
9.6.11.3 Read a Track
After receiving a pulse from the INDEX# pin, the READ A TRACK command reads the entire data field from
each sector of the track as a continuous block. If any ID or Data Field CRC error is found, the FDC continues
to read data from the track and indicates the error at the end. Because the Multi-Track [and Skip] operation[s]
is[are] not allowed under this command, the MT and SK bits should be low (0) during the command execution.
This command terminates normally when the number of sectors specified by EOT has not been read. If,
however, no ID Address Mark has been found by the second occurrence of the INDEX pulse, the FDC will set
the IC code in the ST0 to 01, indicating an abnormal termination, and then finish the command.
9.6.11.4 Write Data
The WRITE DATA command contains nine command bytes that place the FDC into the Write Data mode.
Each WRITE operation is initialized by a WRITE DATA command. The FDC locates the sector to be written
by reading ID fields and matching the sector address from the command with the information on the diskette.
Then the FDC reads the data from the host via the FIFO and writes the data into the sector’s data field.
Finally, the FDC computes the CRC value, storing it in the CRC field and increments the sector number
(stored in the R parameter) by 1. The next data field is written into the next sector in the same manner. Such
a continuous write function is called a "Multi-Sector Write Operation".
If a TC or an implied TC (FIFO overrun/underrun) is received, the FDC stops writing data and fills the
remaining data field with 0s. If a check of the CRC value indicates an error in the sector ID Field, the FDC will
set the IC code in the ST0 to 01 and the DE bit in the ST1 to 1, indicating an abnormal termination, and then
terminate the WRITE DATA command. The maximum data transfer capacity and the DTL, N, and MT
parameters are the same as in the READ DATA command.
9.6.11.5 Write Deleted Data
The WRITE DELETED DATA command is the same as the WRITE DATA command, except that a Deleted
Data Address Mark (instead of a Data Address Mark) is written at the beginning of the Data Field. This
command is typically used to mark a bad sector on a diskette.
9.6.11.6 Format A Track
The FORMAT A TRACK command is used to format an entire track. Initialized by an INDEX pulse, it writes
data to the Gaps, Address Marks, ID fields and Data fields according to the density mode selected (FM or
MFM). The Gap and Data field values are controlled by the host-specified values programmed into N, SC,
GPL, and D during the Command phase. The Data field is filled with the data byte specified by D. The four
data bytes per sector (C, H, R, and N) needed to fill the ID field are supplied by the host. The C, R, H, and N
values must be renewed for each new sector of a track. Only the R parameter value must be changed when
a sector is formatted, allowing the disk to be formatted with non-sequential sector addresses. These steps
are repeated until a new INDEX pulse is received, at which point the FORMAT A TRACK command is
terminated.
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9.6.11.7 SCAN
The SCAN command allows the data read from the disk to be compared with the data sent from the system.
There are three SCAN commands:
SCAN EQUAL Disk Data = System Data
SCAN HIGH OR EQUAL Disk Data ≥ System Data
SCAN LOW OR EQUAL Disk Data ≤ System Data
The SCAN command execution continues until the scan condition has been met, or when the EOT has been
reached, or if TC is asserted. Read errors on the disk have the same error condition as the READ DATA
command. If the SK bit is set, sectors with Deleted Data Address Marks are ignored. If all sectors read are
skipped, the command terminates with the D3 bit of the ST2 being set. The Result phase of the command is
shown below:
Table 9-17. SCAN Command Result
Command
SCAN EQUAL
SCAN HIGH OR EQUAL
SCAN LOW OR EQUAL
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Status Register
D2
D3
Condition
0
1
Disk = System
1
0
Disk ≠ System
0
1
Disk = System
0
0
Disk > System
1
0
Disk < System
0
1
Disk = System
0
0
Disk < System
1
0
Disk > System
98
IT8702F V0.5
Functional Description
9.6.11.8 VERIFY
The VERIFY command is used to read logical sectors containing a Normal Data Address Mark from the
selected drive without transferring the data to the host. This command acts like a READ DATA command
except that no data are transferred to the host. This command is designed for post-format or post write
verification. Data are read from the disk, as the controller checks for valid Address Marks in the Address and
Data Fields. The CRC is computed and checked against the previously stored value. Because no data are
transferred to the host, the TC (Terminal Count of DMA) cannot be used to terminate this command. An
implicit TC will be issued to the FDC by setting the EC bit. This implicit TC will occur when the SC value has
been decremented to 0. This command can also be terminated by clearing the EC bit and when the EOT
value is equal to the final sector to be checked.
Table 9-18. VERIFY Command Result
MT
EC
0
0
SC/EOT
SC = DTL
Termination Result
No Error
EOT ≤ # Sectors per side
0
0
SC = DTL
Abnormal Termination
EOT > # Sectors per side
0
1
SC ≤ # Sectors Remaining
AND
No Error
EOT ≤ # Sectors per side
0
1
SC > # Sectors Remaining
OR
Abnormal Termination
EOT > # Sectors per side
1
0
SC = DTL
No Error
EOT > # Sectors per side
1
0
SC = DTL
Abnormal Termination
EOT > # Sectors per side
1
1
SC ≤ # Sectors Remaining
AND
No Error
EOT ≤ # Sectors per side
1
1
SC > # Sectors Remaining
OR
Abnormal Termination
EOT > # Sectors per side
9.6.12
Control Commands
The control commands do not transfer any data. Instead, these commands are used to monitor and manage
the data transfer. Three of the Control commands generate an interrupt when finished ⎯ READ ID, RECALIBRATE and SEEK. It is strongly recommended that a SENSE INTERRUPT STATUS command be
issued after these commands to capture their valuable interrupt information. The RE-CALIBRATE, SEEK, and
SPECIFY commands do not return any result bytes.
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9.6.12.1 READ ID
The READ ID command is used to find the actual recording head position. It stores the first readable ID field
value into the FDC registers. If the FDC cannot find an ID Address Mark by the time a second INDEX pulse is
received, an abnormal termination will be generated by setting the IC code in the ST0 to 01.
9.6.12.2 Configure
The CONFIGURE command determines some special operation modes of the controller. It needs not to be
issued if the default values of the controller meet the system requirements.
EIS: Enable Implied Seeks. A SEEK operation is performed before a READ, WRITE, SCAN, or VERIFY
command.
0 = Disabled (default).
1 = Enabled.
DFIFO: Disable FIFO.
0 = Enabled.
1 = Disabled (default).
POLLD: Disable polling of the drives.
0 = Enabled (default). When enabled, a single interrupt is generated after a reset.
1 = Disabled.
FIFOTHR: The FIFO threshold in the execution phase of data transfer commands. They are programmable
from 00 to 0F hex (1 byte to 16 bytes). Defaults to 1 byte.
PRETRK: The Precompensation Start Track Number. They are programmable from track 0 to FF hex (track 0
to track 255). Defaults to track 0.
9.6.12.3 RE-CALIBRATE
The RE-CALIBRATE command retracts the FDC read/write head to the track 0 position, resetting the value of
the PCN counter and checking the TRK0# status. If TRK0# is low, the DIR# pin remains low and step pulses
are issued. If TRK0# is high, SE [and EC bits] of the ST0 are set high, and the command is terminated. When
TRK0# remains low for 79 step pulses, the RE-CALIBRATE command is terminated by setting SE and EC
bits of ST0 to high. Consequently, for disks that can accommodate more than 80 tracks, more than one RECALIBRATE command is required to retract the head to the physical track 0.
The FDC is in a non-busy state during the Execution phase of this command, making it possible to issue
another RE-CALIBRATE command in parallel with the current command.
On power-up, software must issue a RE-CALIBRATE command to properly initialize the FDC and the drives
attached.
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100
IT8702F V0.5
Functional Description
9.6.12.4 SEEK
The SEEK command controls the FDC read/write head movement from one track to another. The FDC
compares the current head position, stored in PCN, with NCN values after each step pulse to determine what
direction to move the head, if required. The direction of movement is determined below:
PCN < NCN ⎯ Step In: Sets DIR# signal to 1 and issues step pulses
PCN > NCN ⎯ Step Out: Sets DIR# signal to 0 and issues step pulses
PCN = NCN ⎯ Terminate the command by setting the ST0 SE bit to 1
The impulse rate of step pulse is controlled by Stepping Rate Time (SRT) bit in the SPECIFY command. The
FDC is in a non-busy state during the Execution phase of this command, making it possible to issue another
SEEK command in parallel with the current command.
9.6.12.5 RELATIVE SEEK
The RELATIVE SEEK command steps the selected drive in or out in a given number of steps. The DIR bit is
used to determine to step in or out. RCN (Relative Cylinder Number) is used to determine how many tracks to
step the head in or out from the current track. After the step operation is completed, the controller generates
an interrupt, but the command has no Result phase. No other command except the SENSE INTERRUPT
STATUS command should be issued while a RELATIVE SEEK command is in progress.
9.6.12.6 DUMPREG
The DUMPREG command is designed for system run-time diagnostics, and application software
development, and debug. This command has one byte of Command phase and 10 bytes of Result phase,
which return the values of parameters set in other commands.
9.6.12.7 LOCK
The LOCK command allows the programmer to fully control the FIFO parameters after a hardware reset. If
the LOCK bit is set to 1, the parameters DFIFO, FIFOTHR, and PRETRK in the CONFIGURE command are
not affected by a software reset. If the bit is set to 0, those parameters are set to default values after a
software reset.
9.6.12.8 VERSION
The VERSION command is used to determine the controller being used. In Result phase, a value of 90 hex is
returned in order to be compatible with the 82077.
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IT8702F V0.5
IT8702F
9.6.12.9 SENSE INTERRUPT STATUS
The SENSE INTERRUPT STATUS command resets the interrupt signal (IRQ) generated by the FDC, and
identifies the cause of the interrupt via the IC code and SE bit of the ST0, as shown in Table 9-19.
It may be necessary to generate an interrupt when any of the following conditions occur:
•
•
•
Before any Data Transfer or READ ID command
After SEEK or RE-CALIBRATE commands (no result phase exists)
When a data transfer is required during an Execution phase in the non-DMA mode
Table 9-19. Interrupt Identification
SE
IC Code
0
11
Polling.
1
00
Normal termination of SEEK or RE-CALIBRATE command.
1
01
Abnormal termination of SEEK or RE-CALIBRATE command.
9.6.12.10
Cause of Interrupt
SENSE DRIVE STATUS
The SENSE DRIVE STATUS command acquires drive status information. It has no Execution phase.
9.6.12.11
SPECIFY
The SPECIFY command sets the initial values for the HUT (Head Unload Time), HLT (Head Load Time),
SRT (Step Rate Time), and ND (Non-DMA mode) parameters. The possible values for HUT, SRT, and HLT
are shown in Table 10-20, Table 10-21 and Table 10-22 respectively. The FDC is operated in DMA or nonDMA mode based on the value specified by the ND parameters.
Table 9-20. HUT Values
Parameter
1 Mbps
500 Kbps
300 Kbps
250 Kbps
0
128
256
426
512
1
8
16
26.7
32
-
-
-
-
-
E
112
224
373
448
F
120
240
400
480
Table 9-21. SRT Values
Parameter
1 Mbps
500 Kbps
300 Kbps
250 Kbps
0
8
16
26.7
32
1
7.5
15
25
30
-
-
-
-
-
E
1
2
3.33
4
F
0.5
1
1.67
2
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Functional Description
Table 9-22. HLT Values
Parameter
1 Mbps
500 Kbps
300 Kbps
250 Kbps
00
128
256
426
512
01
1
2
3.33
4
02
2
4
6.7
8
-
-
-
-
-
7E
126
252
420
504
7F
127
254
423
508
9.6.12.12
PERPENDICULAR MODE
The PERPENDICULAR MODE command is used to support the unique READ/WRITE/FORMAT commands
of Perpendicular Recording disk drives (4 Mbytes unformatted capacity). This command configures each of
the four logical drives as a perpendicular or conventional disk drive via the DC3-DC0 bits, or with the GAP
and WG control bits. Perpendicular Recording drives operate in “Extra High Density” mode at 1 Mbps, and
are downward compatible with 1.44 Mbyte and 720 kbyte drives at 500 Kbps (High Density) and 250 Kbps
(Double Density) respectively. This command should be issued during the initialization of the floppy disk
controller. Then, when a drive is accessed for a FORMAT A TRACK or WRITE DATA command, the
controller adjusts the format or Write Data parameters based on the data rate. If WG and GAP are used (not
set to 00), the operation of the FDC is based on the values of GAP and WG. If WG and GAP are set to 00,
setting DCn to 1 will set drive n to the Perpendicular mode. DC3-DC0 are unaffected by a software reset, but
WG and GAP are both cleared to 0 after a software reset.
Table 9-23. Effects of GAP and WG on FORMAT A TRACK and WRITE DATA Commands
GAP
WG
Mode
Length of GAP2
FORMAT FIELD
Portion of GAP2 Re-Written by WRITE
DATA Command
0
0
Conventional
22 bytes
0 bytes
0
1
22 bytes
19 bytes
1
0
22 bytes
0 bytes
1
1
41 bytes
38 bytes
Perpendicular
(500 Kbps)
Reserved
(Conventional)
Perpendicular
(1 Mbps)
Table 9-24. Effects of Drive Mode and Data Rate on FORMAT A TRACK and WRITE DATA Commands
Data Rate
Drive Mode
Length of GAP2
FORMAT FIELD
Portion of GAP2 Re-Written by
WRITE DATA Command
250/300/500 Kbps
Conventional
22 bytes
0 bytes
Perpendicular
22 bytes
19 bytes
Conventional
22 bytes
0 bytes
Perpendicular
41 bytes
38 bytes
1 Mbps
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9.6.12.13 INVALID
The INVALID command indicates when an undefined command has been sent to FDC. The FDC will set the
bit 6 and the bit 7 in the Main Status Register to 1 and terminate the command without issuing an interrupt.
9.6.13
DMA Transfers
DMA transfers are enabled by the SPECIFY command and are initiated by the FDC by activating the LDRQ#
cycle during a DATA TRANSFER command. The FIFO is enabled directly by asserting the LPC DMA cycles.
9.6.14
Low Power Mode
When writing a 1 to the bit 6 of the DSR, the controller is set to low power mode immediately. All the clock
sources including Data Separator, Microcontroller, and Write precompensation unit, will be gated. The FDC
can be resumed from the low-power state in two ways: one is a software reset via the DOR or DSR, and the
other is a read or write to either the Data Register or Main Status Register. The second method is more
preferred since all internal register values are retained.
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IT8702F V0.5
Functional Description
9.7
Serial Port (UART) Description
The IT8702F incorporates two enhanced serial ports that perform serial to parallel conversion on received
data, and parallel to serial conversion on transmitted data. Each of the serial channels individually contains a
programmable baud rate generator which is capable of dividing the input clock by a number ranging from 1 to
65535. The data rate of each serial port can also be programmed from 115.2K baud down to 50 baud. The
character options are programmable for 1 start bit; 1, 1.5 or 2 stop bits; even, odd, stick or no parity; and
privileged interrupts.
Table 9-25. Serial Channel Registers
Register
DLAB*
Data
0
Base + 0h RBR (Receiver Buffer Register)
TBR
(Transmitter
Register)
0
Base + 1h IER (Interrupt Enable Register)
IER
x
Base + 2h IIR (Interrupt Identification Register) FCR (FIFO Control Register)
x
Base + 3h LCR (Line Control Register)
LCR
x
Base + 4h MCR (Modem Control Register)
MCR
1
Base + 0h DLL (Divisor Latch LSB)
DLL
1
Base + 1h DLM (Divisor Latch MSB)
DLM
x
Base + 5h LSR (Line Status Register)
LSR
x
Base + 6h MSR (Modem Status Register)
MSR
Control
Status
Address
READ
x
Base + 7h SCR (Scratch Pad Register)
* DLAB is bit 7 of the Line Control Register.
9.7.1
WRITE
Buffer
SCR
Data Registers
The TBR and RBR individually hold from five to eight data bits. If the transmitted data are less than eight bits,
it aligns to the LSB. Either received or transmitted data are buffered by a shift register, and are latched first by
a holding register. The bit 0 of any word is first received and transmitted.
(1) Receiver Buffer Register (RBR) (Read only, Address offset=0, DLAB=0)
This register receives and holds the incoming data. It contains a non-accessible shift register which converts
the incoming serial data stream into a parallel 8-bit word.
(2) Transmitter Buffer Register (TBR) (Write only, Address offset=0, DLAB=0)
This register holds and transmits the data via a non-accessible shift register, and converts the outgoing
parallel data into a serial stream before the data transmission.
9.7.2
Control Registers: IER, IIR, FCR, DLL, DLM, LCR and MCR
(1) Interrupt Enable Register (IER) (Read/Write, Address offset=1, DLAB=0)
The IER is used to enable (or disable) four active high interrupts which activate the interrupt outputs with its
lower four bits: IER(0), IER(1), IER(2), and IER(3).
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Table 9-26. Interrupt Enable Register Description
Bit
7-4
3
Default
0
2
0
1
0
0
0
Description
Reserved
Enable MODEM Status Interrupt
Sets this bit high to enable the Modem Status Interrupt when one of the Modem Status
Registers changes its bit status.
Enable Receiver Line Status Interrupt
Sets this bit high to enable the Receiver Line Status Interrupt which is caused when
Overrun, Parity, Framing or Break occurs.
Enable Transmitter Holding Register Empty Interrupt
Sets this bit high to enable the Transmitter Holding Register Empty Interrupt.
Enable Received Data Available Interrupt
Sets this bit high to enable the Received Data Available Interrupt and Time-out
interrupt in the FIFO mode.
(2) Interrupt Identification Register (IIR) (Read only, Address offset=2)
This register facilitates the host CPU to determine interrupt priority and its source. The priority of four existing
interrupt levels is listed below:
1.
2.
3.
4.
Receiver Line Status (highest priority)
Received Data Ready
Transmitter Holding Register Empty
Modem Status (lowest priority)
When a privileged interrupt is pending and the type of interrupt is stored in the IIR which is accessed by the
Host, the serial channel holds back all interrupts and indicates the pending interrupts with the highest priority
to the Host. Any new interrupts will not be acknowledged until the Host access is completed. The contents of
the IIR are described in the table on the next page.
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Functional Description
Table 9-27. Interrupt Identification Register
FIFO
Mode
Bit 3
Interrupt
Identification
Register
Bit 2 Bit 1 Bit 0
Interrupt Set and Reset Functions
Priority
Level
0
X
X
1
-
0
1
1
0
0
1
0
1
1
0
0
Interrupt Type
Interrupt Source
Interrupt Reset
Control
None
None
-
First
Receiver Line
Status
OE, PE, FE, or BI
Read LSR
0
Second
Received Data
Available
Received Data
Available
Read RBR or FIFO
drops below the trigger
level
0
0
Second
Character Time-out No characters have Read RBR
Indication
been removed from
or input to the RCVR
FIFO during the last 4
character times and
there is at least 1
character in it during
this time
1
0
Third
Transmitter Holding Transmitter Holding
Register Empty
Register Empty
Read IIR if THRE is the
Interrupt Source
Write THR
0
0
0
0
Fourth
Modem Status
CTS#, DSR#, RI#,
DCD#
Read MSR
Note: X = Not Defined
IIR(7), IIR(6): Are set when FCR(0) = 1.
IIR(5), IIR(4): Always logic 0.
IIR(3): In non-FIFO mode, this bit is a logic 0. In the FIFO mode, this bit is set along with bit 2 when a time-out
Interrupt is pending.
IIR(2), IIR(1): Used to identify the highest priority interrupt pending.
IR(0): Used to indicate a pending interrupt in either a hard-wired prioritized or polled environment with a logic
0 state. In such a case, IIR contents may be used as a pointer that points to the appropriate interrupt service
routine.
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(3) FIFO Control Register (FCR) (Write Only, Address offset=2)
This register is used to enable, clear the FIFO, and set the RCVR FIFO trigger level.
Table 9-28. FIFO Control Register Description
Bit
7-6
Default
-
5-4
3
0
0
2
0
1
0
0
0
Description
Receiver Trigger Level Select
These bits set the trigger levels for the RCVR FIFO interrupt.
Reserved
This bit does not affect the Serial Channel operation. RXRDY and TXRDY functions
are not available on this chip.
Transmitter FIFO Reset
This self-clearing bit clears all contents of the XMIT FIFO and resets its related
counter to 0 via a logic "1."
Receiver FIFO Reset
Setting this self-clearing bit to a logic 1 clears all contents of the RCVR FIFO and
resets its related counter to 0 (except the shift register).
FIFO Enable
XMIT and RCVR FIFOs are enabled when this bit is set high. XMIT and RCVR FIFOs
are disabled and cleared respectively when this bit is cleared to low. This bit must be a
logic 1 if the other bits of the FCR are written to, or they will not be properly
programmed. When this register is switched to non-FIFO mode, all its contents are
cleared.
Table 9-29. Receiver FIFO Trigger Level Encoding
FCR (7)
FCR (6)
RCVR FIFO Trigger Level
0
0
1 byte
0
1
4 bytes
1
0
8 bytes
1
1
14 bytes
(4) Divisor Latches (DLL, DLM) (Read/Write, Address offset=0,1 DLAB=0)
Two 8-bit Divisor Latches (DLL and DLM) store the divisor values in a 16-bit binary format. They are loaded
during the initialization to generate a desired baud rate.
(5) Baud Rate Generator (BRG)
Each serial channel contains a programmable BRG which can take any clock input (from DC to 8 MHz) to
generate standard ANSI/CCITT bit rates for the channel clocking with an external clock oscillator. The DLL or
16
DLM is a number of 16-bit format, providing the divisor range from 1 to 2
The output frequency is 16X data rate.
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to obtain the desired baud rate.
IT8702F V0.5
Functional Description
Table 9-30. Baud Rates Using (24 MHz ÷ 13) Clock
Desired Baud Rate
Divisor Used
50
2304
75
1536
110
1047
134.5
857
150
768
300
384
600
192
1200
96
1800
64
2000
58
2400
48
3600
32
4800
24
7200
16
9600
12
19200
6
38400
3
57600
2
115200
1
(6) Scratch Pad Register (Read/Write, Address offset=7)
This 8-bit register does not control the UART operation in any way. It is intended as a scratch pad register to
be used by programmers to temporarily hold general purpose data.
(7) Line Control Register (LCR) (Read/Write, Address offset=3)
LCR controls the format of the data character and supplies the information of the serial line. Its contents are
described on the next page.
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Table 9-31. Line Control Register Description
Bit
7
Default
0
6
0
5
0
4
0
3
0
2
0
1-0
00
Description
Divisor Latch Access Bit (DLAB)
Must be set to high to access the Divisor Latches of the baud rate generator during
READ or WRITE operations. It must be set low to access the Data Registers (RBR
and TBR) or the Interrupt Enable Register.
Set Break
Forces the Serial Output (SOUT) to the spacing state (logic 0) by a logic 1, and this
state will be preserved until a low level resetting LCR(6), enabling the serial port to
alert the terminal in a communication system.
Stick Parity
When this bit and LCR(3) are high at the same time, the parity bit is transmitted, and
then detected by receiver, in opposite state by LCR(4) to force the parity bit into a
known state and to check the parity bit in a known state.
Even Parity Select
When parity is enabled (LCR(3) = 1), LCR(4) = 0 selects odd parity, and LCR(4) = 1
selects even parity.
Parity Enable
A parity bit, located between the last data word bit and stop bit, will be generated or
checked (transmit or receive data) when LCR(3) is high.
Number of Stop Bits
This bit specifies the number of stop bits in each serial character, as summarized in
table 10-32.
Word Length Select [1:0]
11: 8 bits
10: 7 bits
01: 6 bits
00: 5 bits
Table 9-32. Stop Bits Number Encoding
LCR (2) Word Length No. of Stop Bits
0
-
1
1
5 bits
1.5
1
6 bits
2
1
7 bits
2
1
8 bits
2
Note: The receiver will ignore all stop bits beyond the first, regardless of the number used in transmission.
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Functional Description
(8) MODEM Control Register (MCR) (Read/Write, Address offset=4)
Controls the interface by the modem or data set (or device emulating a modem).
Table 9-33. Modem Control Register Description
Bit
7-5
4
Default
0
3
0
2
0
1
0
0
0
9.7.3
Description
Reserved
Internal Loopback
Provides a loopback feature for diagnostic test of the serial channel when it is set high.
Serial Output (SOUT) is set to the Marking State Shift Register output loops back into
the Receiver Shift Register. All Modem Control inputs (CTS#, DSR#, RI# and DCD#)
are disconnected. The four Modem Control outputs (DTR#, RTS#, OUT1 and OUT2)
are internally connected to the four Modem Control inputs, and are forced to inactive
high and the transmitted data are immediately received, allowing the processor to
verify the transmit and receive data path of the serial channel.
OUT2
The Output 2 bit enables the serial port interrupt output by a logic 1.
OUT1
This bit does not have an output pin and can only be read or written by the CPU.
Request to Send (RTS)
Controls the Request to Send (RTS#) which is in an inverse logic state with that of
MCR(1).
Data Terminal Ready (DTR)
Controls the Data Terminal ready (DTR#) which is in an inverse logic state with that of
the MCR(0).
Status Registers: LSR and MSR
(1) Line Status Register (LSR) (Read/Write, Address offset=5)
This register provides status indications and is usually the first register read by the CPU to determine the
cause of an interrupt or to poll the status of each serial channel. The contents of the LSR are described below:
Table 9-34. Line Status Register Description
Bit
7
Default
0
6
1
5
1
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Description
Error in Receiver FIFO
In 16450 mode, this bit is always 0. In the FIFO mode, it sets high when there is at
least one parity error, framing or break interrupt in the FIFO. This bit is cleared when
the CPU reads the LSR, if there are no subsequent errors in the FIFO.
Transmitter Empty
This read only bit indicates that the Transmitter Holding Register and Transmitter Shift
Register are both empty. Otherwise, this bit is "0," and has the same function in the
FIFO mode.
Transmitter Holding Register Empty
Transmitter Holding Register Empty (THRE). This read only bit indicates that the TBR
is empty and is ready to accept a new character for transmission. It is set high when a
character is transferred from the THR into the Transmitter Shift Register, causing a
priority 3 IIR interrupt which is cleared by a read of IIR. In the FIFO mode, it is set
when the XMIT FIFO is empty, and is cleared when at least one byte is written to the
XMIT FIFO.
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Line Status Register Description [cont’d]
Bit
4
Default
0
3
0
2
0
1
0
0
0
Description
Line Break
Break Interrupt (BI) status bit indicates that the last character received was a break
character, (invalid but entire character), including parity and stop bits. This occurs
when the received data input is held in the spacing (logic 0) for longer than a full word
transmission time (start bit + data bits + parity + stop bit). When any of these error
conditions is detected (LSR(1) to LSR(4)), a Receiver Line Status interrupt (priority 1)
will be generated in the IIR, with the IER(2) previously enabled.
Framing Error
Framing Error (FE) bit, a logic 1, indicates that the stop bit in the received character is
not valid. It resets low when the CPU reads the contents of the LSR.
Parity Error
Parity error (PE) indicates by a logic 1 that the received data character does not have
the correct even or odd parity, as selected by LCR(4). It will be reset to "0" whenever
the LSR is read by the CPU.
Overrun Error
Overrun Error (OE) bit indicates by a logic 1 that the RBR has been overwritten by the
next character before it had been read by the CPU. In the FIFO mode, the OE occurs
when the FIFO is full and the next character has been completely received by the Shift
Register. It will be reset when the LSR is read by the CPU.
Data Ready
A "1" indicates a character has been received by the RBR. A logic "0" indicates all the
data in the RBR or the RCVR FIFO have been read.
(2) MODEM Status Register (MSR) (Read/Write, Address offset=6)
This 8-bit register indicates the current state of the control lines with modems or the peripheral devices in
addition to this current state information. Four of these eight bits MSR(4) - MSR(7) can provide the state
change information when a modem control input changes state. It is reset low when the Host reads the MSR.
Table 9-35. Modem Status Register Description
Bit
7
Default
0
6
0
5
0
4
0
3
0
2
0
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Description
Data Carrier Detect
Data Carrier Detect - Indicates the complement status of Data Carrier Detect (DCD#)
input. If MCR(4) = 1, MSR(7) is equivalent to OUT2 of the MCR.
Ring Indicator
Ring Indicator (RI#) - Indicates the complement status to the RI# input. If MCR(4)=1,
MSR(6) is equivalent to OUT1 in the MCR.
Data Set Ready
Data Set Ready (DSR#) - Indicates that the modem is ready to provide received data
to the serial channel receiver circuitry. If the serial channel is in the Loop mode
(MCR(4) = 1), MSR(5) is equivalent to DTR# in the MCR.
Clear to Send
Clear to Send (CTS#) - Indicates the complement of CTS# input. When the serial
channel is in the Loop mode (MCR(4)=1), MSR(5) is equivalent to RTS# in the MCR.
Delta Data Carrier Detect
Indicates that the DCD# input state has been changed since the last time read by the
Host.
Trailing Edge Ring Indicator
Indicates that the RI input state to the serial channel has been changed from a low to
high since the last time read by the Host. The change to a logic “1” does not activate
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IT8702F V0.5
Functional Description
Bit
Default
1
0
0
0
9.7.4
Reset
Description
the TERI.
Delta Data Set Ready
Delta Data Set Ready (DDSR) - A logic "1" indicates that the DSR# input state to the
serial channel has been changed since the last time read by the Host.
Delta Clear to Send
This bit indicates the CTS# input to the chip has changed state since the last time the
MSR was read.
The reset of the IT8702F should be held to an idle mode reset high for 500 ns until initialization, which causes
the initialization of the transmitter and receiver internal clock counters.
Table 9-36. Reset Control of Registers and Pinout Signals
Register/Signal
Reset Control
Reset Status
Interrupt Enable Register
Reset
All bits Low
Interrupt Identification Register
Reset
Bit 0 is high and bits 1-7 are low
FIFO Control Register
Reset
All bits Low
Line Control Register
Reset
All bits Low
Modem Control Register
Reset
All bits Low
Line Status Register
Reset
Modem Status Register
Reset
Bits 5 and 6 are high, others are
low
SOUT1, SOUT2
Reset
Bits 0-3 low, bits 4-7 input signals
RTS1#, RTS2#, DTR1#, DTR2#
Reset
High
IRQ of Serial Port
Reset
High
High Impedance
9.7.5
Programming
Each serial channel of the IT8702F is programmed by control registers, whose contents define the character
length, number of stop bits, parity, baud rate and modem interface. Even though the control register can be
written in any given order, the IER should be the last register written because it controls the interrupt enables.
After the port is programmed, these registers can still be updated whenever the port is not transferring data.
9.7.6
Software Reset
This approach allows the serial port returning to a completely known state without a system reset. This is
achieved by writing the required data to the LCR, DLL, DLM and MCR. The LSR and RBR must be read
before interrupts are enabled to clear out any residual data or status bits that may be invalid for subsequent
operations.
9.7.7
Clock Input Operation
The input frequency of the Serial Channel is 24 MHz ÷ 13, not exactly 1.8432 MHz.
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9.7.8
FIFO Interrupt Mode Operation
(1) RCVR Interrupt
When setting FCR(0)=1 and IER(0)=1, the RCVR FIFO and receiver interrupts are enabled. The RCVR
interrupt occurs under the following conditions:
The receive data available interrupt will be issued only if the FIFO has reached its programmed trigger level.
They will be cleared as soon as the FIFO drops below its trigger level.
The receiver line status interrupt has higher priority over the received data available interrupt.
The time-out timer will be reset after receiving a new character or after the Host reads the RCVR FIFO
whenever a time-out interrupt occurs. The timer will be reset when the Host reads one character from the
RCVR FIFO.
RCVR FIFO time-out Interrupt: By enabling the RCVR FIFO and receiver interrupts, the RCVR FIFO time-out
interrupt will occur under the following conditions:
The RCVR FIFO time-out interrupt will occur only if there is at least one character in the FIFO whenever the
interval between the most recent received serial character and the most recent Host READ from the FIFO is
longer than four consecutive character times.
The time-out timer will be reset after receiving a new character or after the Host reads the RCVR FIFO
whenever a time-out interrupt occurs. The timer will be reset when the Host reads one character from the
RCVR FIFO.
(2) XMIT Interrupt
By setting FCR(0) and IER(1) to high, the XMIT FIFO and transmitter interrupts are enabled, and the XMIT
interrupt occurs under the conditions described below:
a. The transmitter interrupt occurs when the XMIT FIFO is empty, and it will be reset if the THR is written or
the IIR is read.
b. The transmitter FIFO empty indications will be delayed one character time minus the last stop bit time
whenever the following condition occurs: THRE = 1 and there have not been at least two bytes in the
transmitter FIFO at the same time since the last THRE = 1. The transmitter interrupt after changing FCR(0)
will be immediate, if it is enabled. Once the first transmitter interrupt is enabled, the THRE indication is
delayed one character time minus the last stop bit time.
The character time-out and RCVR FIFO trigger level interrupts are in the same priority order as the received
data available interrupt. The XMIT FIFO empty is in the same priority as the transmitter holding register empty
interrupt.
FIFO Polled Mode Operation [FCR(0)=1, and IER(0), IER(1), IER(2), IER(3) or all are 0].
Either or both XMIT and RCVR can be in this operation mode. The operation mode can be programmed by
users and is responsible for checking the RCVR and XMIT status via the LSR described below:
LSR(7): RCVR FIFO error indication.
LSR(6): XMIT FIFO and Shift register empty.
LSR(5): The XMIT FIFO empty indication.
LSR(4) - LSR(1): Specify that errors have occurred. Character error status is handled in the same way as in
the interrupt mode. The IIR is not affected since IER(2)=0.
LSR(0): High whenever the RCVR FIFO contains at least one byte.
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Functional Description
No trigger level is reached or time-out condition indicated in the FIFO Polled Mode.
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IT8702F
9.8
Smart Card Reader
9.8.1
Features
As an IFD (InterFace Device) built in IT8702F, the Smart Card Reader (SCR) includes a standard UART
(Either Serial Port 1 or Serial Port 2 is set in SCR mode) to control Smart Card interface handshaking and
then performs data transfers, and can be connected to smart card socket directly. The Smart Card is capable
of providing secured storage facilities for sensitive personal information (such as Private keys, Account
numbers, Passwords, Medical information, …etc.). Then the SCR can be used for a broad range of
applications in GSM, ID, pay TV, banking (refer to EMV’96 Spec.), … and so forth. It also provides a Smart
Card clock divider for those ICC (Integrated Circuit Card) without internal clocks.
9.8.2
Operation
The SCR is a low-power consumption design. Whenever the IFD is inactive, the clock divider will turn off
internal clocks even when the clock of IFD controlling / monitoring state machine is turned off to save power
consumption. Also it could be waked up immediately when IC card is removed in case of emergency or when
the FET control function is turned on/off.
The VCC power of IC card interface is powered from an external FET to protect the smart card interface. Also,
the charge/discharge time for FET to reach 5V/0V is programmable, and FET performs automatically to meet
ISO 7816 activation and deactivation sequences. The UART’s modem control lines: DTR#, RTS# and DCD#
are used for controlling FET on/off, Smart Card Reset signal and IC card insertion detection respectively.
When an IC card is being inserted, it will switch the SCRPSNT# (Smart Card Present Detect#) and then
cause the DCD# signal to trigger an interrupt to the system. Then in the Smart Card interrupt service routine,
the driver can assert the DTR# signal to power on the external FET (SCRPFET#) and the RTS# signal to
control the Smart Card Reset signal (SCRRST). In the mean time, IT8702F will generate a proper clock
frequency to allow the IC card using default serial transfer baud rate to send back an ATR (Answer-To-Reset)
sequence. The interface signals are enabled after VCC reaches enough voltage level. Then transfer protocol
may be negotiated to promote more efficient transfers. In the same way, when the IC card is removed in case
of emergency or when the ICC processing is finished, the driver can de-assert the DTR# to turn off the FET
power. But before the FET power-off and the reset, clock and data signals will be de-active, followed by a
sufficient FET discharge time guaranteed to protect IC card and IFD.
9.8.3
Connection of IFD to ICC Socket
SCR_IFD in IT8712F
FET
SCRPFET#
IC Card
SCRRST
UART
IFD
VCC
RESET
CLOCK
RFU
SCRIO
GND
VPP
I/O
RFU
SCRPRES#
Clock
Generator
SCRCLK
Figure 9-4. Smart Card Reader Application
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Functional Description
9.8.4
Baud Rate Relationship Between UART and Smart Card Interface
To perform serial transfers correctly, the baud rate of UART must be set in ways similar to the ICC card.
•
Formula (Variation < 2%)
UART
Smart Card
24 MHz
SCRCLK * D
13
≈
Baud Rate =
F
16 * N
N =Divisor of UART, assigned by programming the DLM (Divisor Latch MSB) and DLL (Divisor Latch LSB).
F =Clock Rate Conversion Factor, default = 372.
D =Bit Rate Adjustment Factor, Default is 1.
SCRCLK duty cycle is 45%-55%.
•
ICC With Internal Clock
ICC may use built-in internal clock, then the Baud rate is 9600 baud, just programming the Divisor Latch
Registers of UART in the IT8702F for SCR IFD.
•
ICC Without Internal Clock
Baud rate is SCRCLK/372 before negotiating, and SCRCLK is limited within 1 MHz - 5MHz. During the ATR
sequence, the default F value (Clock Rate Conversion Factor) is 372, and the default D value (Bit Rate
Adjustment Factor) is 1.
9.8.5
Waveform Relationship
(24 MHz/13)/12/16
(24 MHz/13)/12
9600 Baud
Rate Output
1/9600 seconds
16 BAUD clocks
SCRIO
SCRCLK
1 etu=372 SCRCLK
Figure 9-5. 9600 Baud Rate Example
9.8.6
Clock Divider
The SCRCLK is generated as the selection of SCR_CLKSEL1-0, which are determined in the S1 Special
Configuration register 3 (LDN1_F2h) or S2 Special Configuration register 3 (LDN2_F2h).
Table 9-37. SCRCLK Selections
SCR_CLKSEL1-0
Selections
00
Stop
01
3.5 MHz
10
7.1 MHz
11
96 MHz / SCR DIV96M Note
Note: SCR DIV96M is determined by S1 Special Configuration Register 4
(LDN1_F3h) or S2 Special Configuration Register 4 (LDN2_F3h).
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9.8.7
Waveform Example of Activation/Deactivation Sequence
Activation Sequence
SCR_power-on
ATR from ICC with Internal Reset
Enable SCRIO
Deactivation Sequence
Enable :
1. SCRRST = ~RTS#
2. SCRCLK if SCR_CLKSEL1-0 is not 00b.
Flow_CLK
DTR#
RTS#
SOUT
CARDVCC
SCRPRES#
SCRPFET#
PTS, Tx
Interrupt if IC card
emergency removed
VCC Charge time
is 13/53/212 µ s
Interrupt
SCRRST
SCRCLK
SCRIO
ATR, PTS, Xfer
Figure 9-6. Waveform Example of IFD
•
Activation Sequence
Refer to the waveform above. The SCR IFD in the IT8702F will make sure the IFD is in data receive mode
(i.e. the SOUT from UART is high), and the RTS# should be programmed to high. The SCRCLK is then
enabled to output to the IC card (which means that the IC card can count SCRCLK clock numbers to start
ATR responses), the data transfer is then enabled, and the SCRRST is the inverse logic state of RTS#. Also,
the operation procedure guarantees the correct activation sequence even if the driver cannot program the
SCRCLK and SCRRST in the precise time points. In this way, the hardware meets the ICC specification.
•
ATR
For the IC card with its own internal reset, its ATR begins within 400-40000 SCRCLK cycles. If no ATR is
detected, the Smart Card IFD driver can then program the RTS# to low, and cause the SCRRST to high.
For some types of IC cards without internal reset signals, it will check out the SCRRST as active low reset,
and begins its ATR within 400-40000 SCRCLK cycles from the time point of SCRRST rising edge.
The IT8702F does not support the type of IC Card that may send synchronous ATRs.
•
Deactivation and PTS Structure
Whenever the IC card is removed or when the IFD driver intends to power off the SCR interface, the IFD will
enter the deactivation sequence.
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Functional Description
9.8.8
ATR and PTS Structure
The contents of the ATR (Answer-To-Reset) and PTS (Protocol-Type-Select) are defined in ISO/IEC 7816-X
standards, which must be fully communicated by the ICC Resource manager, the ICC Service provider or the
ICC application software.
After finalizing the coherent protocol, the SCR IFD enters the normal transfer mode. Since the SCRIO is the
only data channel for both data transmit and receive as defined in the ICC Specification, the IT8702F can
only support the half-duplex function. The SCRRST can be resent when a data transfer error occurs, and
then the IFD driver will select a safer, lower-speed protocol to perform the data transfers again.
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9.8.9
Smart Card Operating Sequence Example
H/W Reset
Waiting for ICC Insertion
IDLE
Interrupt by UART sense PRESENT#
N
Insert
Y
Power up FET to 5V, then allow CLOCK out and Reset
control, I/O in receive mode
Power Up,
Clock
Active level may differ
Reset Card
N1
ICC responses to Answer-To-Reset within 400 - 40000 cloc
cycles of SCCLK, if N1, then RESET active high, if N2, then
deactive
ATR
Y
Driver translates the ATR
Decoding ATR
If no protocol is available, then treat as all default setting;
If more protocols are available, the Driver can select a suita
transfer protocol
Protocol Error
More
Protocols
Y
Y
IFD sends Protocol-Type-Selection request, and intends to
change Xfer protocol
PTS Request
N
PTS Confirm
Change Protocol
Transfer
N2
If the ICC accepts, then returns a confirm code
Both IFD and ICC changed to new compromised protocol
Begin to Xfer Data
N
Finish
For normal deactivation, the Driver controls the IFD to enter
Deactive sequence
Y
Clock Stop
Power Down
Emergency
Remove
Stop Clock
Then power down FET
Remove
If users remove the ICC at any time
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Functional Description
9.9
Parallel Port
The IT8702F incorporates one multi-mode high performance parallel port, which supports the IBM AT, PS/2
compatible bi-directional Standard Parallel Port (SPP), the Enhanced Parallel Port (EPP) and the Extended
Capabilities Port (ECP). Please refer to the IT8702F Configuration registers and Configuration Description for
information on enabling/ disabling, changing the base address of the parallel port, and operation mode
selection.
Table 9-38. Parallel Port Connector in Different Modes
Host Connector
Pin No.
SPP
EPP
ECP
1
108
STB#
WRITE#
NStrobe
2-9
109-116
PD0 - 7
PD0 - 7
PD0 - 7
10
103
ACK#
INTR
11
102
BUSY
WAIT#
Busy PeriphAck(2)
12
101
PE
(NU) (1)
PError nAckReverse(2)
13
100
SLCT
(NU) (1)
Select
14
107
AFD#
DSTB#
nAutoFd HostAck(2)
15
106
ERR#
(NU) (1)
nFault nPeriphRequest(2)
16
105
INIT#
(NU) (1)
nInit nReverseRequest(2)
17
104
SLIN#
ASTB#
nSelectIn
nAck
Note1: NU: Not used.
Note 2: Fast mode.
Note 3: For more information, please refer to the IEEE 1284 standard.
9.9.1
SPP and EPP Modes
Table 9-39. Address Map and Bit Map for SPP and EPP Modes
Register
Address
I/O
D0
D1
D2
D3
D4
D5
D6
D7
Mode
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
SPP/EPP
TMOUT
1
1
Data Port
Base 1+0h R/W
Status Port
Base 1+1h
Control Port
Base 1+2h R/W
STB
AFD
INIT
SLIN IRQE PDDIR
EPP Address Port Base 1+3h R/W
PD0
PD1
PD2
PD3
PD4
EPP Data Port0
Base 1+4h R/W
PD0
PD1
PD2
PD3
EPP Data Port1
Base 1+5h R/W
PD0
PD1
PD2
EPP Data Port2
Base 1+6h R/W
PD0
PD1
EPP Data Port3
Base 1+7h R/W
PD0
PD1
R
ERR# SLCT
PE
ACK# BUSY# SPP/EPP
1
1
SPP/EPP
PD5
PD6
PD7
EPP
PD4
PD5
PD6
PD7
EPP
PD3
PD4
PD5
PD6
PD7
EPP
PD2
PD3
PD4
PD5
PD6
PD7
EPP
PD2
PD3
PD4
PD5
PD6
PD7
EPP
Note 1: The Base address 1 depends on the Logical Device configuration registers of Parallel Port (0X60,
0X61).
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(1) Data Port (Base Address 1 + 00h)
This is a bi-directional 8-bit data port. The direction of data flow is determined by the bit 5 of the logic state of
the control port register. It forwards directions when the bit is low and reverses directions when the bit is high.
(2) Status Port (Base Address 1 + 01h)
This is a read only register. Writing to this register has no effects. The contents of this register are latched
during an IOR cycle.
Bit 7 - BUSY#: Inverse of printer BUSY signal, a logic "0" means that the printer is busy and cannot accept
another character. A logic "1" means that it is ready to accept the next character.
Bit 6 - ACK#: Printer acknowledge, a logic "0" means that the printer has received a character and is ready to
accept another. A logic "1" means that it is still processing the last character.
Bit 5 - PE: Paper end, a logic "1" indicates the paper end.
Bit 4 - SLCT: Printer selected, a logic "1" means that the printer is on line.
Bit 3 - ERR#: Printer error signal, a logic "0" means an error has been detected.
Bits 2, 1 - Reserved: These bits are always "1" when read.
Bit 0 - TMOUT: This bit is valid only in EPP mode and indicates that a 10-msec time-out has occurred in EPP
operation. A logic "0" means no time-out occurred and a logic “1” means that a time-out error has been
detected. This bit is cleared by an LRESET# or by writing a logic “1” to it. When the IT8702F is selected to
non-EPP mode (SPP or ECP), this bit is always a logic "1" when read.
(3) Control Port (Base Address 1 + 02h)
This port provides all output signals to control the printer. The register can be read and written.
Bits 6, 7- Reserved: These two bits are always "1" when read.
Bit 5 - PDDIR: Data port direction control. This bit determines the direction of the data port register. Set this
bit "0" to output the data port to PD bus, and "1" to input from PD bus.
Bit 4 - IRQE: Interrupt request enable. Setting this bit "1" enables the interrupt requests from the parallel port
to the Host. An interrupt request is generated by a "0" to "1" transition of the ACK# signal.
Bit 3 - SLIN: Inverse of SLIN# pin. Setting this bit to "1" selects the printer.
Bit 2 - INIT: Initiate printer. Setting this bit to "0" initializes the printer.
Bit 1 - AFD: Inverse of the AFD# pin. Setting this bit to "1" causes the printer to automatically advance one
line after each line is printed.
Bit 0 - STB: Inverse of the STB# pin. This pin controls the data strobe signal to the printer.
(4) EPP Address Port (Base Address 1 + 03h)
The EPP Address Port is only available in the EPP mode. When the Host writes to this port, the contents of
D0 -D7 are buffered and output to PD0 - PD7. The leading edge of IOW (Internal signal, active when LPC I/O
WRITE cycle is on this address) causes an EPP ADDRESS WRITE cycle. When the Host reads from this
port, the contents of PD0 - PD7 are read. The leading edge of IOR (Internal signal, active when LPC I/O
READ cycle is on this address) causes an EPP ADDRESS READ cycle.
(5) EPP Data Ports 0-3 (Base Address 1 + 04-07h)
The EPP Data Ports are only available in the EPP mode. When the Host writes to these ports, the contents of
D0 - D7 are buffered and output to PD0 - PD7. The leading edge of IOW (Internal signal, active when LPC I/O
WRITE cycle is on this address) causes an EPP DATA WRITE cycle. When the Host reads from these ports,
the contents of PD0 - PD7 are read. The leading edge of IOR (Internal signal, active when LPC I/O READ
cycle is on this address) causes an EPP DATA READ cycle.
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Functional Description
9.9.2
EPP Mode Operation
When the parallel port of the IT8702F is set in the EPP mode, the SPP mode is also available. If no EPP
Address/Data Port address is decoded (Base address + 03h- 07h), the PD bus is in the SPP mode, and the
output signals such as STB#, AFD#, INIT#, and SLIN# are set by the SPP control port. The direction of the
data port is controlled by the bit 5 of the control port register. There is a 10-msec time required to prevent the
system from lockup. The time has elapsed from the beginning of the IOCHRDY (Internal signal: When active,
the IT8702F will issue Long Wait in SYNC field) high (EPP READ/WRITE cycle) to WAIT# being de-asserted.
If a time-out occurs, the current EPP READ/WRITE cycle is aborted and a logic "1" will be read in the bit 0 of
the status port register. The Host must write 0 to bits 0, 1, 3 of the control port register before any EPP
READ/WRITE cycle (EPP spec.). The pins STB#, AFD# and SLIN# are controlled by hardware for the
hardware handshaking during EPP READ/WRITE cycle.
(1) EPP ADDRESS WRITE
1.
2.
3.
4.
The Host writes a byte to the EPP Address Port (Base address + 03h). The chip drives D0 - D7 onto
PD0 - PD7.
The chip asserts WRITE# (STB#) and ASTB# (SLIN#) after IOW becomes active.
The peripheral de-asserts WAIT#, indicating that the chip may begin the termination of this cycle. Then,
the chip de-asserts ASTB#, latches the address from D0 - D7 to PD bus, allowing the Host to complete
the I/O WRITE cycle.
The peripheral asserts WAIT#, indicating that it acknowledges the termination of the cycle. Then, the
chip de-asserts WRITE to terminate the cycle.
(2) EPP ADDRESS READ
1.
2.
3.
4.
The Host reads a byte from the EPP Address Port. The chip drives PD bus to tri-state for the peripheral
to drive.
The chip asserts ASTB# after IOR becomes active.
The peripheral drives the PD bus valid and de-asserts WAIT#, indicating that the chip may begin the
termination of this cycle. Then, the chip de-asserts ASTB#, latches the address from PD bus to D0 -D7,
allowing the Host to complete the I/O READ cycle.
The peripheral drives the PD bus to tri-state and then asserts WAIT#, indicating that it acknowledges the
termination of the cycle.
(3) EPP DATA WRITE
1.
2.
3.
4.
The host writes a byte to the EPP Data Port (Base address +04H - 07H). The chip drives D0- D7 onto
PD0 -PD7.
The chip asserts WRITE# (STB#) and DSTB# (AFD#) after IOW becomes active.
The peripheral de-asserts WAIT#, indicating that the chip may begin the termination of this cycle. Then,
the chip de-asserts DSTB#, latches the data from D0 - D7 to the PD bus, allowing the Host to complete
the I/O WRITE cycle.
The peripheral asserts WAIT#, indicating that it acknowledges the termination of the cycle. Then, the
chip de-asserts WRITE to terminate the cycle.
(4) EPP DATA READ
1.
2.
3.
4.
The Host reads a byte from the EPP DATA Port. The chip drives PD bus to tri-state for the peripheral to
drive.
The chip asserts DSTB# after IOR becomes active.
The peripheral drives PD bus valid and de-asserts WAIT#, indicating that the chip may begin the
termination of this cycle. Then, the chip de-asserts DSTB#, latches the data from PD bus to D0 - D7,
allowing the host to complete the I/O READ cycle.
The peripheral tri-states the PD bus and then asserts WAIT#, indicating that it acknowledges the
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termination of the cycle.
9.9.3
ECP Mode Operation
This mode is both software and hardware compatible with the existing parallel ports, allowing ECP to be used
as a standard LPT port when the ECP mode is not required. It provides an automatic high-burst-bandwidth
channel that supports DMA or the ECP mode in both forward and reverse directions. A 16-byte FIFO is
implemented in both forward and reverse directions to smooth data flow and enhance the maximum
bandwidth requirement allowed. The port supports automatic handshaking for the standard parallel port to
improve compatibility and expedite the mode transfer. It also supports run-length encoded (RLE)
decompression in hardware. Compression is accomplished by counting identical bytes and transmitting an
RLE byte that indicates how many times a byte has been repeated. The IT8702F does not support hardware
RLE compression. For a detailed description, please refer to "Extended Capabilities Port Protocol and ISA
Interface Standard".
Table 9-40. Bit Map of the ECP Registers
Register
D7
D6
D5
D4
D3
D2
D1
D0
data
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
ecpAFifo
Addr/RLE
dsr
nBusy
nAck
PError
Select
nFault
1
1
1
dcr
1
1
PDDIR
IRQE
SelectIn
nInit
AutoFd
Strobe
Address or RLE field
cFifo
Parallel Port Data FIFO
ecpDFifo
ECP Data FIFO
tFifo
Test FIFO
cnfgA
0
0
0
1
0
0
0
0
cnfgB
0
intrValue
0
0
0
0
0
0
nErrIntrEn
dmaEn
ServiceIntr
full
empty
ecr
mode
(1) ECP Register Definitions
Table 9-41. ECP Register Definitions
Name
Address
I/O
ECP Mode
Function
data
Base 1 +000H
R/W
000-001
ecpAFifo
Base 1 +000H
R/W
011
ECP FIFO (Address)
dsr
Base 1 +001H
R/W
All
Status Register
dcr
Base 1 +002H
R/W
All
Control Register
cFifo
Base 2 +000H
R/W
010
Parallel Port Data FIFO
ecpDFifo
Base 2 +000H
R/W
011
ECP FIFO (DATA)
tFifo
Base 2 +000H
R/W
110
Test FIFO
cnfgA
Base 2 +000H
R
111
Configuration Register A
cnfgB
Base 2 +001H
R/W
111
Configuration Register B
ecr
Base 2 +002H
R/W
All
Extended Control Register
Data Register
Note 1: The Base address 1 depends on the Logical Device configuration registers of Parallel Port (0X60,
0X61).
Note 2: The Base address 2 depends on the Logical Device configuration registers of Parallel Port (0X62,
0X63).
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(2) ECP Mode Descriptions
Table 9-42. ECP Mode Descriptions
Mode
Description
000
Standard Parallel Port Mode
001
PS/2 Parallel Port Mode
010
Parallel Port FIFO Mode
011
ECP Parallel Port Mode
110
Test Mode
111
Configuration Mode
Note: Please refer to the ECP Register Description on pages 128-129 for a detailed description of the mode
selection.
(3) ECP Pin Descriptions
Table 9-43. ECP Pin Descriptions
Name
nStrobe (HostClk)
Attribute
Description
Used for handshaking with Busy to write data and addresses into the
O
peripheral device.
Address or data or RLE data.
PD0-PD7
I/O
Used for handshaking with nAutoFd to transfer data from the peripheral
nAck (PeriphClk)
I
device to the Host.
The peripheral uses this signal for flow control in the forward direction
Busy (PeriphACK)
I
(handshaking with nStrobe). In the reverse direction, this signal is used to
determine whether a command or data information is present on PD0-PD7.
Used to acknowledge nInit from the peripheral which drives this signal low,
Perror
I
allowing the host to drive the PD bus.
(nAckReverse)
Printer On-Line Indication.
Select
I
In the reverse direction, it is used for handshaking between the nAck and the
nAutoFd (HostAck)
O
Host. When it is asserted, a peripheral data byte is requested. In the forward
direction, this signal is used to determine whether a command or data
information is present on PD0 - PD7.
In the forward direction (only), the peripheral is allowed (but not required) to
nFault
I
assert this signal (low) to request a reverse transfer while in ECP mode. The
(nPeriphRequest)
signal provides a mechanism for peer-to-peer communication. It is typically
used to generate an interrupt to host, which has the ultimate control over the
transfer direction.
The host may drive this signal low to place the PD bus in the reverse
nInit
O
direction. In the ECP mode, the peripheral is permitted to drive the PD bus
(nReverseRequest)
when nInit is low, and nSelectIn is high.
NSelectIn
O
Always inactive (high) in the ECP mode.
(1284 Active)
(4) Data Port (Base 1+00h, Modes 000 and 001)
Its contents will be cleared by a RESET. In a WRITE operation, the contents of the LPC data fields are
latched by the Data Register. The contents are then sent without being inverted to PD0-PD7. In a READ
operation, the contents of data ports are read and sent to the host.
(5) ecpAFifo Port (Address/RLE) (Base 1 +00h, Mode 011)
Any data byte written to this port are placed in the FIFO and tagged as an ECP Address/RLE. The hardware
then automatically sends this data to the peripheral. Operation of this port is valid only in the forward direction
(dcr(5)=0).
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(6) Device Status Register (dsr) (Base 1 +01h, Mode All)
Bits 0, 1 and 2 of this register are not implemented. These bit states are remained at high in a READ
operation of the Printer Status Register.
dsr(7): This bit is the inverted level of the Busy input.
dsr(6): This bit is the state of the nAck input.
dsr(5): This bit is the state of the PError input.
dsr(4): This bit is the state of the Select input.
dsr(3): This bit is the state of the nFault input.
dsr(2)-dsr(0): These bits are always 1.
(7) Device Control Register (dcr) (Base 1+02h, Mode All)
Bits 6 and 7 of this register have no function. They are set high during the READ operation, and cannot be
written. Contents in bits 0-5 are initialized to 0 when the RESET pin is active.
dcr(7)-dcr(6): These two bits are always high.
dcr(5):Except in the modes 000 and 010, setting this bit low means that the PD bus is in output operation;
setting it high, in input operation. This bit will be forced to low in mode 000.
dcr(4): Setting this bit high enables the interrupt request from peripheral to the host due to a rising edge
of the nAck input.
dcr(3): It is inverted and output to SelectIn.
dcr(2): It is output to nInit without inversion.
dcr(1): It is inverted and output to nAutoFd.
dcr(0): It is inverted and output to nStrobe.
(8) Parallel Port Data FIFO (cFifo) (Base 2+00h, Mode 010)
Bytes written or DMA transferred from the Host to this FIFO are sent by a hardware handshaking to the
peripheral according to the Standard Parallel Port protocol. This operation is only defined for the forward
direction.
(9) ECP Data FIFO (ecpDFifo) (Base 2+00h, Mode 011)
When the direction bit dcr(5) is 0, bytes written or DMA transferred from the Host to this FIFO are sent by
hardware handshaking to the peripheral according to the ECP parallel port protocol. When dcr(5) is 1, data
bytes from the peripheral to this FIFO are read in an automatic hardware handshaking. The Host can receive
these bytes by performing READ operations or DMA transfers from this FIFO.
(10) Test FIFO (tFifo) (Base 2+00h, Mode 110)
The host may operate READ/WRITE or DMA transfers to this FIFO in any directions. Data in this FIFO will be
displayed on the PD bus without using hardware protocol handshaking. The tFifo will not accept new data
after it is full. Making a READ from an empty tFifo causes the last data byte to return.
(11) Configuration Register A (cnfgA) (Base 2+00h, Mode 111)
This read only register indicates to the system that interrupts are ISA-Pulses compatible. This is an 8-bit
implementation by returning a 10h.
(12) Configuration Register B (cnfgB) (Base 2+01h, Mode 111)
This register is read only.
cnfgB(7): A logic “0” read indicates that the chip does not support hardware RLE compression.
cnfgB(6): Reserved.
cnfgB(5)-cnfg(3): A value 000 read indicates that the interrupt must be selected with jumpers.
cnfgB(2)-cnfg(0): A value 000 read indicates that the DMA channel is jumpered 8-bit DMA.
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Functional Description
(13) Extended Control Register (ecr) (Base 2+02h, Mode All)
ECP function control register.
ecr(7)-ecr(5): These bits are used for READ/WRITE and mode selection.
Table 9-44. Extended Control Register (ECR) Mode and Description
ECR
Mode and Description
Standard Parallel Port Mode
000
The FIFO is reset and the direction bit dcr(5) is always 0 (forward direction) in this mode.
PS/2 Parallel Port Mode
It is similar to the SPP mode, except that the dcr(5) is read/write. When dcr(5) is 1, the PD bus is tri001
state. Reading the data port returns the value on the PD bus instead of the value of the data
register.
Parallel Port Data FIFO Mode
This mode is similar to the 000 mode, except that the Host writes or DMA transfers the data bytes to
010
the FIFO. The FIFO data are then transmitted to the peripheral using the standard parallel port
protocol automatically. This mode is only valid in the forward direction (dcr(5)=0).
ECP Parallel Port Mode
In the forward direction, bytes placed into the ecpDFifo and ecpAFifo are placed in a single FIFO
011
and automatically transmitted to the peripheral under the ECP protocol. In the reverse direction,
bytes are transmitted to the ecpDFifo from the ECP port.
100, 101 Reserved, not defined.
Test Mode
110
In this mode, the FIFO may be read from or written to, but it cannot be sent to the peripheral.
Configuration Mode
111
In this mode, the cnfgA and cnfgB registers are accessible at 0x400 and 0x401.
ecr(4): nErrIntrEn, READ/WRITE, Valid in ECP(011) Mode
1: Disables the interrupt generated on the asserting edge of the nFault input.
0: Enables the interrupt pulse on the asserting edge of the nFault. An interrupt pulse will be generated if
nFault is asserted, or if this bit is written from 1 to 0 in the low-level nFault.
ecr(3): dmaEn, READ/WRITE
1: Enables DMA. DMA starts when serviceIntr (ecr(2)) is 0.
0: Disables DMA unconditionally.
ecr(2): ServiceIntr, READ/WRITE
1: Disables DMA and all service interrupts.
0: Enables the service interrupts. This bit will be set to “1” by hardware when one of the three service
interrupts has occurred.
Writing “1” to this bit will not generate an interrupt.
Case 1: dmaEn=1
During DMA, this bit is set to 1 (a service interrupt generated) if the terminal count is reached.
Case 2: dmaEn=0, dcr(5)=0
This bit is set to 1 (a service interrupt generated) whenever there are writeIntrThreshold or more bytes
space free in the FIFO.
Case 3: dmaEn=0, dcr(5)=1
This bit is set to 1 (a service interrupt generated) whenever there are readIntrThreshold or more valid
bytes to be read from the FIFO.
ecr(1): full, read only
1: The FIFO is full and cannot accept another byte.
0: The FIFO has at least 1 free data byte space.
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ecr(0): empty, read only
1: The FIFO is empty.
0: The FIFO contains at least 1 data byte.
(14) Mode Switching Operation
In programmed I/O control (mode 000 or 001), P1284 negotiation and all other tasks that happen before data
transmission are software-controlled. Setting mode to 011 or 010 will cause the hardware to perform an
automatic control-line handshaking, transferring information between the FIFO and the ECP port.
From the mode 000 or 001, any other mode may be immediately switched to any other mode. To change
direction, the mode must first be set to 001.
In the extended forward mode, the FIFO must be cleared and all the signals must be de-asserted before
returning to mode 000 or 001. In ECP reverse mode, all data must be read from the FIFO before returning to
mode 000 or 001. Usually, unneeded data are accumulated during ECP reverse handshaking, when the
mode is changed during a data transfer. In such conditions, nAutoFd will be de-asserted regardless of the
transfer state. To avoid bugs during handshaking signals, these guidelines must be followed.
(15) Software Operation (ECP)
Before the ECP operation can begin, it is first necessary for the Host to switch the mode to 000 in order to
negotiate with the parallel port. During this process, the Host determines whether the peripheral supports the
ECP protocol.
After this negotiation is completed, the mode is set to 011 (ECP). To enable the drivers, the direction must be
set to 0. Both strobe and autoFd are set to 0, causing nStrobe and nAutoFd signals to be de-asserted.
All FIFO data transfers are PWord wide and PWord aligned. Permitted only in the forward direction,
Address/RLE transfers are byte-wide. The ECP Address/RLE bytes may be automatically sent by writing to
the ecpAFifo. Similarly, data PWords may be automatically sent via the ecpDFifo.
To change directions, the Host switches mode to 001. It then negotiates either the forward or reverse channel,
sets the direction to 1 or 0, and finally switches mode to 001. If the direction is set to 1, the hardware
performs the handshaking for each ECP data byte read, then tries to fill the FIFO. At this time, PWords may
be read from the ecpDFifo while it retains data. It is also possible to perform the ECP transfers by
handshaking with individual bytes under programmed control in mode = 001, or 000, even though this is a
comparatively time-consuming approach.
(16) Hardware Operation (DMA)
The Standard PC DMA protocol (through LDRQ#) is followed. As in the programmed I/O case, software sets
THE direction and state. Next, the desired count and memory addresses are programmed into DMA
controller. The dmaEn is set to 1, and the serviceIntr is set to 0. To complete the process, the DMA channel
with the DMA controller is unmasked. The contents in the FIFO are emptied or filled by DMA using the right
mode and direction.
DMA is always transferred to or from the FIFO located at 0 x 400. By generating an interrupt and asserting a
serviceIntr, DMA is disabled when the DMA controller reaches the terminal count. By not asserting LDRQ#
for more than 32 consecutive DMA cycles, blocking of refresh requests is eliminated.
When it is necessary to disable a DMA while performing a transfer, the host DMA controller is disabled,
serviceIntr is then set to 1, and dmaEn is next set to 0. If the contents in FIFO are empty or full, the DMA will
start again. This is first done by enabling the host DMA controller, and then setting dmaEn to 1. Finally,
serviceIntr is set to 0. Upon completion of a DMA transfer in the forward direction, the software program must
wait until the contents in FIFO are empty and the busy line is low, ensuring that all data successfully reach
the peripheral device.
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Functional Description
(17) Interrupts
It is necessary to generate an interrupt when any of the following states are reached.
1. serviceIntr = 0, dmaEn = 0, direction = 0, and the number of PWords in the FIFO is greater than or equal
to writeIntrThreshold.
2. serviceIntr = 0, dmaEn = 0, direction = 1, and the number of PWords in the FIFO is greater than or equal
to readIntrThreshold.
3. serviceIntr = 0, dmaEn = 1, and DMA reaches the terminal count.
4. nErrIntrEn = 0 and nFault goes from high to low or when nErrIntrEn is set from 1 to 0 and nFault is
asserted.
5. ackIntEn = 1. In current implementations of using existing parallel ports, the interrupt generated may be
either edge or level trigger type.
(18) Interrupt Driven Programmed I/O
It is also possible to use an interrupt-driven programmed I/O to execute either ECP or parallel port FIFOs. An
interrupt will occur in the forward direction when serviceIntr is 0 and the number of free PWords in the FIFO is
equal to or greater than writeIntrThreshold. If either of these conditions is not met, it may be filled with
writeIntrThreshold PWords. An interrupt will occur in the reverse direction when serviceIntr is 0 and the
number of available PWords in the FIFO is equal to readIntrThreshold. If it is full, the FIFO can be completely
emptied in a single burst. If it is not full, only a number of PWords equal to readIntrThreshold may be read
from the FIFO in a single burst. In the Test mode, software can determine the values of writeIntrThreshold,
readIntrThreshold, and FIFO depth while accessing the FIFO.
Any PC LPC bus implementation that is adjusted to expedite DMA or I/O transfer must ensure that the
bandwidth on the ISA is maintained on the interface. Although the LPC (even PCI) bus of PC cannot be
directly controlled, the interface bandwidth of ECP port can be constrained to perform at the optimum speed.
(19) Standard Parallel Port
In the forward direction with DMA, the standard parallel port is run at or close to the permitted peak bandwidth
of 500 KB/sec. The state machine does not examine nAck, but just begins the next DMA based on the Busy
signal.
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9.10
Keyboard Controller (KBC)
The keyboard controller is implemented using an 8-bit microcontroller that is capable of executing the 8042
instruction set. For general information, please refer the description of the 8042 in the 8-bit controller
handbook. In addition, the microcontroller can enter power-down mode by executing two types of powerdown instructions. The 8-bit microcontroller has 256 bytes of RAM for data memory and 2 Kbytes of ROM for
the program storage.
The ROM codes may come from various vendors (or users), and are programmed during the manufacturing
process. To assist in developing ROM codes, the keyboard controller has an external access mode. In the
external access mode, the internal ROM is disabled and the instructions executed by the microcontroller
come from an externally connected ROM.
Keyboard P20
Controller P21
KRST*
GATEA20
P26
T0
KCLK
P27
P10
KDAT
P23
T1
MCLK
P22
P11
MDAT
P24
KIRQ
P25
MIRQ
Figure 9-7. Keyboard and Mouse Interface
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Functional Description
9.10.1
Host Interface
The keyboard controller interfaces with the system through the 8042 style host interface. The table 10-45
shows how the interface decodes the control signals.
Table 9-45. Data Register READ/WRITE Controls
Host Address Note
R/W*
60h
R
READ DATA
60h
W
WRITE DATA, (Clear F1)
64h
R
READ Status
64h
W
WRITE Command, (set F1)
Function
Note: These are the default values of the LDN5, 60h and 61h (DATA); LDN5, 62h and 63h (Command). All
these registers are programmable.
READ DATA: This is an 8-bit read only register. When read, the KIRQ output is cleared and OBF flag in the
status register is cleared.
WRITE DATA: This is an 8-bit write only register. When written, the F1 flag of the Status register is cleared
and the IBF bit is set.
READ Status: This is an 8-bit read only register. Refer to the description of the Status register for more
information.
WRITE Command: This is an 8-bit write only register. When written, both F1 and IBF flags of the Status
register are set.
9.10.2
Data Registers and Status Register
The keyboard controller provides two data registers: one is DBIN for data input, and the other is DBOUT for
data output. Each of the data registers is 8 bits wide. A write (microcontroller) to the DBOUT will load
Keyboard Data Read Buffer, set OBF flag and set the KIRQ output. A read (microcontroller) of the DBIN will
read the data from the Keyboard Data or Command Write Buffer and clear the IBF flag.
The status register holds information concerning the status of the data registers, the internal flags, and some
user-defined status bits. Please refer to Table 10-46. The bit 0 OBF is set to “1” when the microcontroller
writes a data into DBOUT, and is cleared when the system initiates a DATA READ operation. The bit 1 IBF is
set to “1” when the system initiates a WRITE operation, and is cleared when the microcontroller executes an
“IN A, DBB” instruction. The F0 and F1 flags can be set or reset when the microcontroller executes the clear
and complement flag instructions. F1 also holds the system WRITE information when the system performs
the WRITE operations.
Table 9-46. Status Register
7
6
5
4
3
2
1
0
ST7
ST6
ST5
ST4
F1
F0
IBF
OBF
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9.10.3
Keyboard and Mouse Interface
KCLK is the keyboard clock pin. Its output is the inversion of pin P26 of the microcontroller, and the input of
KCLK is connected to the T0 pin of the microcontroller. KDAT is the keyboard data pin; its output is the
inversion of pin P27 of the microcontroller, and the input of KDAT is connected to the P10 of the
microcontroller. MCLK is the mouse clock pin; its output is the inversion of pin P23 of the microcontroller, and
the input of MCLK is connected to the T1 pin of the microcontroller. MDAT is the Mouse data pin; its output is
the inversion of pin P22 of the microcontroller, and the input of MDAT is connected to the P11 of the
microcontroller. KRST# is pin P20 of the microcontroller. GATEA20 is the pin P21 of the microcontroller.
These two pins are used as software controlled or user defined outputs. External pull-ups may be required for
these pins.
9.10.4
KIRQ and MIRQ
KIRQ is the interrupt request for keyboard (Default IRQ1), and MIRQ is the interrupt request for mouse
(Default IRQ12). KIRQ is internally connected to P24 pin of the microcontroller, and MIRQ is internally
connected to pin P25 of the microcontroller.
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Functional Description
9.11
9.11.1
Consumer Remote Control (TV Remote) IR (CIR)
Overview
The CIR is used in Consumer Remote Control equipment, and is a programmable amplitude shift keyed (ASK)
serial communication protocol. By adjusting frequencies, baud rate divisors and sensitivity ranges, the CIR
registers are able to support the popular protocols such as RC-5, NEC, and RECS-80. Software driver
programming can support new protocols.
9.11.2
Features
Supports 30 kHz – 57 kHz (low frequency) or 400 kHz – 500 kHz (high frequency) carrier transmission
Baud rates up to 115200 BPS (high frequency)
Demodulation optional
Supports transmission run-length encoding and deferral functions
32-byte FIFO for data transmission or data reception
9.11.3
Block Diagram
The CIR consists of the Transmitter and Receiver parts. The Transmitter part is responsible for transmitting
data to the FIFO, processing the FIFO data by serialization, modulation and sending out the data through the
LED device. The Receiver part is responsible for receiving data, processing data by demodulation,
deserialization and storing data in the Receiver FIFO.
00000000
11110000
Transmitter
Transmitter
FIFO
Serialization
Modulator
data
Host Interface
Interface &
Registers
Baud Rate Gen.
data
Receiver
Interrupt Gen.
Receiver
FIFO
Deserialization
Demodulator
00000000
11110000
Figure 9-8. CIR Block Diagram
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9.11.4
Transmit Operation
The data written to the Transmitter FIFO will be exactly serialized from LSB to MSB, modulated with carrier
frequency and sent to the CIRTX output. The data are either in bit-string format or run-length decode.
Before the data transmission can begin, code byte write operations must be performed to the Transmitter
FIFO DR. The bit TXRLE in the TCR1 should be set to “1” before the run-length decode data can be written
into the Transmitter FIFO. Set TXENDF in the TCR1 will enable the data transmission deferral, and avoid the
transmitter FIFO underrun. The bit width of the serialized bit string is determined by the value programmed in
the baud rate divisor registers BDLR and BDHR. When the bits HCFS and CFQ[4:0] are set, either the highspeed or low-speed carrier range is selected, and the corresponding carrier frequency will also be determined.
Bits TXMPM[1:0] and TXMPW[2:0] specify the pulse numbers in a bit width and the required duty cycles of
the carrier pulse according to the communication protocol. Only a logic “0” can activate the Transmitter LED
in the format of a series of modulating pulses.
9.11.5
Receive Operation
The Receiver function is enabled if the bit RXEN in the RCR is set to “1”. Either demodulated or modulated
RX# signal is loaded in0to the Receiver FIFO, and the bit RXEND in the RCR determines the demodulation
logic should be used or not. Determine the baud rate by programming the baud rate divisor registers BDLR
and BDHR, and the carrier frequencies by programming the bits HCFS and CFQ[4:0]. Set RDWOS to “0” to
sync. The bit RXACT in the RCR is set to “1” when the serial data or the selected carrier is incoming, and the
sampled data will then be kept in the Receiver FIFO. Write “1” to the bit RXACT to stop the Receiver
operation; “0” to the bit RXEN to disable the Receiver.
9.11.6
Register Descriptions and Address
Table 9-47. List of CIR Registers
Register Name
R/W
Address
Default
CIR Data Register (DR)
R/W
Base + 0h
FFh
CIR Interrupt Enable Register (IER)
R/W
Base + 1h
00h
CIR Receiver Control Register (RCR)
R/W
Base + 2h
01h
CIR Transmitter Control Register 1 (TCR1)
R/W
Base + 3h
00h
CIR Transmitter Control Register 2 (TCR2)
R/W
Base + 4h
5Ch
CIR Transmitter Status Register (TSR)
R
Base + 5h
00h
CIR Receiver Status Register (RSR)
R
Base + 6h
00h
CIR Baud Rate Divisor Low Byte Register (BDLR)
R/W
Base + 5h
00h
CIR Baud Rate Divisor High Byte Register (BDHR)
R/W
Base + 6h
00h
CIR Interrupt Identification Register (IIR)
R/W
Base + 7h
01h
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Functional Description
9.11.6.1 CIR Data Register (DR)
The DR, an 8-bit read/write register, is the data port for CIR. Data are transmitted and received through this
register.
Address: Base Address + 0h
Bit
7–0
R/W
R/W
Default
FFh
Description
CIR Data Register (DR[7:0])
Writing data to this register causes data to be written to the Transmitter
FIFO.
Reading data from this register causes data to be received from the
Receiver FIFO.
9.11.6.2 CIR Interrupt Enable Register (IER)
The IER, an 8-bit read/write register, is used to enable the CIR interrupt request.
Address: Base Address + 1h
Bit
R/W
Default
7-6
5
R/W
0b
4
R/W
0b
3
R/W
0b
2
R/W
0b
1
R/W
0b
0
R/W
0b
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Description
Reserved for ITE use
RESET (RESET)
This bit is a software reset function. Writing a “1” to this bit resets the
registers of DR, IER, TCR1, BDLR, BDHR and IIR. This bit is then
cleared to initial value automatically.
Baud Rate Register Enable Function Enable (BR)
This bit is used to control the baud rate registers enable read/write
function.
Set this bit to “1” to enable the baud rate registers for CIR.
Set this bit to “0” to disable the baud rate registers for CIR.
Interrupt Enable Function Control (IEC)
This bit is used to control the interrupt enable function.
Set this bit to “1” to enable the interrupt request for CIR.
Set this bit to “0” to disable the interrupt request for CIR.
Receiver FIFO Overrun Interrupt Enable (RFOIE)
This bit is used to control Receiver FIFO Overrun Interrupt request.
Set this bit to “1” to enable Receiver FIFO Overrun Interrupt request.
Set this bit to “0” to disable Receiver FIFO Overrun Interrupt request.
Receiver Data Available Interrupt Enable (RDAIE)
This bit is used to enable Receiver Data Available Interrupt request. The
Receiver will generate this interrupt when the data available in the FIFO
exceed the FIFO threshold level.
Set this bit to “1” to enable Receiver Data Available Interrupt request.
Set this bit to “0” to disable Receiver Data Available Interrupt request.
Transmitter Low Data Level Interrupt Enable (TLDLIE)
This bit is used to enable Transmitter Low Data Level Interrupt request.
The Transmitter will generate this interrupt when the data available in the
FIFO are less than the FIFO threshold Level.
Set this bit to “1” to enable Transmitter Low Data Level Interrupt request.
Set this bit to “0” to disable Transmitter Low Data Level Interrupt request.
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9.11.6.3 CIR Receiver Control Register (RCR)
The RCR, an 8-bit read/write register, is used to control the CIR Receiver.
Address: Base Address + 2h
Bit
7
R/W
R/W
Default
0b
6
R/W
0b
5
R/W
0b
4
R/W
0b
3
R/W
0b
2-0
R/W
001b
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Description
Receiver Data Without Sync. (RDWOS)
This bit is used to control the sync. logic for receiving data.
Set this bit to “1” to obtain the receiving data without sync. logic.
Set this bit to “0” to obtain the receiving data in sync. logic.
High-Speed Carrier Frequency Select (HCFS)
This bit is used to select Carrier Frequency between high-speed and
low-speed.
0: 30-58 kHz (Default)
1: 400-500 kHz
Receiver Enable (RXEN)
This bit is used to enable Receiver function. Enable Receiver and the
RXACT will be active if the selected carrier frequency is received.
Set this bit to ”1” to enable the Receiver function.
Set this bit to “0” to disable the Receiver function.
Receiver Demodulation Enable (RXEND)
This bit is used to control the Receiver Demodulation logic. If the
Receiver device can not demodulate the correct carrier, set this bit to “1”.
Set this bit to “1” to enable Receiver Demodulation logic.
Set this bit to “0” to disable Receiver Demodulation logic.
Receiver Active (RXACT)
This bit is used to control the Receiver operation.
This bit is set to “0” when the Receiver is inactive.
This bit will be set to “1” when the Receiver detects a pulse (RXEND=0)
or pulse-train (RXEND=1) with correct carrier frequency. The Receiver
then starts to sample the input data when Receiver Active is set. Write a
“1” to this bit to clear the Receiver Active condition and make the
Receiver enter the inactive mode.
Receiver Demodulation Carrier Range (RXDCR[2:0])
These three bits are used to set the tolerance of the Receiver.
Demodulation carrier frequency. See Table 10-49 and Table 10-50.
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9.11.6.4 CIR Transmitter Control Register 1 (TCR1)
The TCR1, an 8-bit read/write register, is used to control the Transmitter.
Address: Base Address + 3h
Bit
7
R/W
R/W
Default
0b
6
R/W
0b
5-4
R/W
0b
3
R/W
0b
2
R/W
0b
1-0
R/W
0b
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Description
FIFO Clear (FIFOCLR)
Writing a “1” to this bit clears the FIFO. This bit is then cleared to “0”
automatically.
Internal Loopback Enable (ILE)
This bit is used to execute internal loopback for test and must be “0” in
normal operation.
Set this bit to “0” to disable the Internal Loopback mode.
Set this bit to “1” to enable the Internal Loopback mode.
FIFO Threshold Level (FIFOTL)
These two bits are used to set the FIFO Threshold Level. The FIFO
length is 32 bytes for TX or RX function (ILE = 0) in normal operation and
16 bytes for both TX and RX in internal Loopback mode (ILE = 1).
16-Byte Mode
32-Byte Mode
00
1
1 (Default)
01
3
7
10
7
17
11
13
25
Transmitter Run Length Enable (TXRLE)
This bit controls the Transmitter Run Length encoding/decoding mode,
which condenses a series of “1” or “0” into one byte with the bit value
stored in bit 7 and number of bits minus 1 in bits 6 – 0.
Set this bit to “1” to enable the Transmitter Run Length mode.
Set this bit to “0” to disable the Transmitter Run Length mode.
Transmitter Deferral (TXENDF)
This bit is used to avoid Transmitter underrun condition.
When this bit is set to “1”, the Transmitter FIFO data will be kept until the
transmitter time-out condition occurs, or the FIFO reaches full.
Transmitter Modulation Pulse Mode (TXMPM[1:0])
These two bits are used to define the Transmitter modulation pulse
mode.
TXMPM[1:0]
Modulation Pulse Mode
C_pls mode (Default): Pulses are generated continuously for the entire
logic 0 bit time.
8_pls mode: 8 pulses are generated for each logic 0 bit.
6_pls mode: 6 pulses are generated for each logic 0 bit.
11: Reserved.
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9.11.6.5 CIR Transmitter Control Register (TCR2)
The TCR2, an 8-bit read/write register, is used to determine the carrier frequency.
Address: Base Address + 4h
Bit
R/W
Default
7-3
R/W
01011b
2-0
R/W
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100b
Description
Carrier Frequency (CFQ[4:0])
These five bits are used to determine the modulation carrier frequency.
See Table 10-48.
Transmitter Modulation Pulse Width (TXMPW[2:0])
These three bits are used to set the Transmitter Modulation pulse width.
The duty cycle of the carrier will be determined according to the settings
of Carrier Frequency and the selection of Transmitter Modulation pulse
width.
TXMPW[2:0]
HCFS = 0
HCFS = 1
000
Reserved
Reserved
001
Reserved
Reserved
010
6 µs
0.7 µs
011
7 µs
0.8 µs
100
8.7 µs
0.9 µs (Default)
101
10.6 µs
1.0 µs
110
13.3 µs
1.16 µs
111
Reserved
Reserved
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Table 9-48. Modulation Carrier Frequency
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CFQ
Low Frequency
(HCFS =0)
High Frequency
(HCFS = 1)
00000
27 kHz
-
00010
29 kHz
-
00011
30 kHz
400 kHz
00100
31 kHz
-
00101
32 kHz
-
00110
33 kHz
-
00111
34 kHz
-
01000
35 kHz
450 kHz
01001
36 kHz
-
01010
01011
01100
37 kHz
38 kHz (default)
39 kHz
480 kHz (default)
-
01101
40 kHz
500 kHz
01110
41 kHz
-
01111
42 kHz
-
10000
43 kHz
-
10001
44 kHz
-
10010
45 kHz
-
10011
46 kHz
-
10100
47 kHz
-
10101
48 kHz
-
10110
49 kHz
-
10111
50 kHz
-
11000
51 kHz
-
11001
52 kHz
-
11010
53 kHz
-
11011
54 kHz
-
11100
55 kHz
-
11101
56 kHz
-
11110
57 kHz
-
11111
58 kHz
-
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Table 9-49. Receiver Demodulation Low Frequency (HCFS = 0)
RXDCR
CFQ
001
Min.
010
Max.
Min.
Max.
Min.
100
Max.
Min.
Max.
(Hz)
00011
28.13 31.88 26.25 33.75 24.38 35.63
00100
29.06 32.94 27.13 34.88 25.19 36.81 23.25 38.75 21.31 40.69 19.38 42.63 31k
28
36
26
38
24
17.5
Max.
27.19 30.81 25.38 32.63 23.56 34.44 21.75 36.25 19.94 38.06 18.13 39.88 29k
22.5
35 19.25 36.75
Min.
00010
34
21
Max.
26.25 29.75
30
31.5 22.75 33.25
Min.
110
101
00001
00101
24.5
011
38.5 28k
37.5 20.63 39.38 18.75 41.25 30k
40
22
42
20
44 32k
00110
30.94 35.06 28.88 37.13 26.81 39.19 24.75 41.25 22.69 43.31 20.63 45.38 33k
00111
31.88 36.13 29.75 38.25 27.63 40.38
01000
32.81 37.19 30.63 39.38 28.44 41.56 26.25 43.75 24.06 45.94 21.88 48.13 35k
01001
33.75 38.25
01010
34.69 39.31 32.38 41.63 30.06 43.94 27.75 46.25 25.44 48.56 23.13 50.88 37k
01011
35.63 40.38 33.25 42.75 30.88 45.13
01100
36.56 41.44 34.13 43.88 31.69 46.31 29.25 48.75 26.81 51.19 24.38 53.63 39k
01101
37.5
42.5
31.5
35
40.5 29.25 42.75
45
32.5
47.5
25.5
27
28.5
30
42.5 23.38 44.63 21.25 46.75 34k
45 24.75 47.25
22.5
49.5 36k
47.5 26.13 49.88 23.75 52.25 38k
50
27.5
52.5
25
55 40k
01110
38.44 43.56 35.88 46.13 33.31 48.69 30.75 51.25 28.19 53.81 25.63 56.38 41k
01111
39.38 44.63 36.75 47.25 34.13 49.88
10000
40.31 45.69 37.63 48.38 34.94 51.06 32.25 53.75 29.56 56.44 26.88 59.13 43k
10001
41.25 46.75
10010
42.19 47.81 39.38 50.63 36.56 53.44 33.75 56.25 30.94 59.06 28.13 61.88 45k
10011
43.13 48.88 40.25 51.75 37.38 54.63
10100
44.06 49.94 41.13 52.88 38.19 55.81 35.25 58.75 32.31 61.69 29.38 64.63 47k
10101
45
51
38.5
42
49.5 35.75 52.25
54
39
57
31.5
33
34.5
36
52.5 28.88 55.13 26.25 57.75 42k
55 30.25 57.75
27.5
60.5 44k
57.5 31.63 60.38 28.75 63.25 46k
60
33
63
30
66 48k
10110
45.94 52.06 42.88 55.13 39.81 58.19 36.75 61.25 33.69 64.31 30.63 67.38 49k
10111
46.88 53.13 43.75 56.25 40.63 59.38
11000
47.81 54.19 44.63 57.38 41.44 60.56 38.25 63.75 35.06 66.94 31.88 70.13 51k
11001
49.18 54.55 46.88 57.69 44.78 61.22 42.86 65.22
11010
49.69 56.31 46.38 59.63 43.06 62.94 39.75 66.25 36.44 69.56 33.13 72.88 53k
11011
50.63 57.38 47.25 60.75 43.88 64.13
11100
51.56 58.44 48.13 61.88 44.69 65.31 41.25 68.75 37.81 72.19 34.38 75.63 55k
11101
11110
52.5
59.5
49
63
45.5
66.5
37.5
40.5
42
62.5 34.38 65.63 31.25 68.75 50k
41.1 69.77 39.47
75 52k
67.5 37.13 70.88 33.75 74.25 54k
70
38.5
73.5
35
77 56k
53.44 60.56 49.88 64.13 46.31 67.69 42.75 71.25 39.19 74.81 35.63 78.38 57k
www.ite.com.tw
140
IT8702F V0.5
Functional Description
Table 9-50. Receiver Demodulation High Frequency (HCFS = 1)
RXDCR
CFQ
001
Min.
00011
01000
375
Max.
Min.
425
350
011
Max.
450
Min.
100
Max.
325
475
Min.
300
101
Max.
500
Min.
275
110
Max.
525
Min.
250
Max. (Hz)
550 400k
421.9 478.1 393.8 506.3 365.6 534.4 337.5 562.5 309.4 590.6 281.3 618.8 450k
01011
01011
010
450
510
420
540
390
570
360
600
330
630
300
660 480k
468.8 531.3 437.5 562.5 406.3 593.8
375
625 343.8 656.3 312.5 687.5 500k
9.11.6.6 CIR Baud Rate Divisor Low Byte Register (BDLR)
The BDLR, an 8-bit read/write register, is used to program the CIR Baud Rate clock.
Address: Base Address + 5h (when BR = 1)
Bit
7-0
R/W
R/W
Default
00h
Description
Baud Rate Divisor Low Byte (BDLR[7:0])
These bits are the low byte of the register used to divide the Baud Rate
clock.
9.11.6.7 CIR Baud Rate Divisor High Byte Register (BDHR)
The BDHR, an 8-bit read/write register, is used to program the CIR Baud Rate clock.
Address: Base Address + 6h (when BR = 1)
Bit
7-0
R/W
R/W
Default
00h
Description
Baud Rate Divisor High Byte (BDHR[7:0])
These bits are the high byte of the register used to divide the Baud Rate
clock.
Baud rate divisor = 115200 / baud rate
Ex1: 2400 bps
115200 /2400 = 48
48(d) = 0030(h)
BDHR = 00h, BDLR = 30h
Ex2: bit width = 0.565 ms
1770 bps
115200 / 1770 = 65(d) = 0041(h)
BDHR = 00(h), BDLR = 41(h)
9.11.6.8 CIR Transmitter Status Register (TSR)
The TSR, an 8-bit read only register, provides the Transmitter FIFO status.
Address: Base Address + 5h
Bit
7-6
5-0
R/W
R
R
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Default
000000b
Description
Reserved
Transmitter FIFO Byte Count (TXFBC[5:0])
Return the number of bytes left in the Transmitter FIFO.
141
IT8702F V0.5
IT8702F
9.11.6.9 CIR Receiver FIFO Status Register (RSR)
The RSR, an 8-bit read only register, provides the Receiver FIFO status.
Address: Base Address + 6h
Bit
7
R/W
R
Default
0b
6
5-0
R
000000b
9.11.6.10
Description
Receiver FIFO Time-out (RXFTO)
This bit will be set to “1” when a Receiver FIFO time-out condition
occurs.
The conditions that must exist for a Receiver FIFO time-out condition to
occur include the followings:
a. At least one byte has been in the Receiver FIFO is not empty for 64
ms more
b. The receiver has been inactive (RXACT=0) for over 64 ms or more
c. More than 64 ms have elapsed since the last byte was read from the
Receiver FIFO by the CPU
Reserved
Receiver FIFO Byte Count (RXFBC)
Return the number of bytes left in the Receiver FIFO.
CIR Interrupt Identification Register (IIR)
The IIR, an 8-bit register, is used to identify the pending interrupts.
Address: Base address + 7h
Bit
7-3
2-1
0
R/W
R
R
www.ite.com.tw
Default
00b
1b
Description
Reserved
Interrupt Identification
These two bits are used to identify the source of the pending interrupt.
IIR[1:0]
Interrupt Source
00
No interrupt
01
Transmitter Low Data Level Interrupt
10
Receiver Data Stored Interrupt
11
Receiver FIFO Overrun Interrupt
Interrupt Pending
This bit will be set to “1” while an interrupt is pending.
142
IT8702F V0.5
Functional Description
9.12
Game Port Interface
The Game Port integrates four timers for two joysticks. The IT8702F allows the Game Port base address to
be located anywhere within the host I/O address space from 100h to 0FFFh. Currently, most game software
assume that the Game (or Joystick) I/O port is located at 201h.
A write to the Game port base address will trigger four timers. A read from the same address returns four bits
that correspond to the outputs from the four timers and four status bits corresponding to the joystick buttons.
A button value of 0 indicates that the button is pressed. When the Game port base address is written, the X/Y
timer bits go high. Once the Game port base address is written, each timer output remains high for a period of
time specified by the current joystick position.
9.12.1
Game Port (Base+0h)
Bit
Symbol
Description
7
JSBB2
Joystick B, Button 2 ( pin 20 of Joystick connector)
6
JSBB1
Joystick B, Button 1 ( pin 21 of Joystick connector)
5
JSAB2
Joystick A, Button 2 ( pin 24 of Joystick connector)
4
JSAB1
Joystick A, Button 1 ( pin 25 of Joystick connector)
3
JSBCY
Joystick B, Coordinate Y ( pin 22 of Joystick connector)
2
JSBCX
Joystick B, Coordinate X ( pin 23 of Joystick connector)
1
JSACY
Joystick A, Coordinate Y ( pin 26 of Joystick connector)
0
JSACX
Joystick A, Coordinate X ( pin 27 of Joystick connector)
9.13
MIDI Interface
The IT8702F supports the MIDI capability by incorporating hardware to emulate the MPU-401 in the UART
mode. It is software compatible with MPU-401 interface, but only supports the UART mode (non-intelligent
mode). The UART is used to convert parallel data to the serial data required by MIDI. The serial data format
is RS-232 like: 1 start bit, 8 data bits, and 1 stop bit. The serial data rate is fixed at 31.25K baud.
9.13.1
MPU-401 Register Interface
The MPU-401 logical device occupies two consecutive I/O spaces. The device also uses an interrupt. Both
the base address and the interrupt level are programmable. MIDI Base+0 is the MIDI Data port, and MIDI
Base+ 1 is the Command/Status port.
MIDI Data Port: The MIDI Data Port is used to transmit and receive MIDI data. When in UART mode, all
transmit data are transferred through a 16-byte FIFO and receive data through another 16-byte FIFO.
MIDI Data Port, MIDI base+0, Read/Write
Bit
Symbol
Description
7-0
D7-D0 MIDI data 7-0
Command/Status Port: The Command register is used to send instructions to the MPU-401. The Status
register is used to receive status information from the MPU-401. These two registers occupy the same I/O
address.
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143
IT8702F V0.5
IT8702F
Command Port, MIDI base+1, Write Only
Bit
7-0
Symbol
Description
C7-C0 MIDI instruction command code 7-0
Status Port, MIDI base+1, Read Only
Bit
Symbol
7
RXS
Receive Buffer Status Flag
0: Data in Receive Buffer.
1: Receive Buffer empty.
6
TXS
Transmit Buffer Status Flag
0: Transmit Buffer not full.
1: Transmit Buffer full.
5-0
Reserved, always report 3Fh
9.13.2
Description
Operation
In the IT8702F, only two MPU-401 device instructions are available: RESET (code: FFh) and UART mode
command (code: 3Fh). After power-up reset, the interface is in the Intelligent mode (non-UART mode). In
this mode, the operation is defined as follows:
1.
2.
3.
All reads of the DATA port, MIDI base+0, return the acknowledged code (FEh). Because only two
commands are available, the receive buffer is always placed an acknowledge code in the intelligent
mode.
All writes to the DATA port, MIDI base+0, are ignored.
All writes to the Command port, MIDI base+1, are monitored and acknowledged as follows:
3Fh:Sets the interface into the UART mode and loads an acknowledged code (FEh) into the receive
buffer which generates an interrupt.
FFh:Sets the interface into the initialization condition.
Others: Not implemented.
UART Mode:
1. All reads of the DATA port, MIDI base+0, return the next byte in the receive buffer FIFO. The serial data
received from the MIDI_IN pin is stored in the receive buffer FIFO. The bit 7 RXS of the Status register is
updated to reflect the new receive buffer FIFO state. The receive data available interrupt will be issued
only if the FIFO has reached its programmed trigger level. They will be cleared as soon as the FIFO
drops below its trigger level. The trigger level is programmable by changing bits 2-1 of the MIDI port
Special Configuration register, LDN8_F0h.
2. All writes to the DATA port, MIDI base+0, are placed in the transmit buffer FIFO. Whenever the transmit
buffer FIFO is not empty, the data bytes are read from the buffer in turn and sent out from the MIDI_OUT
pin. The bit 6 TXS of the Status register is updated to reflect the new transmit buffer FIFO state.
3. All writes to the Command port, MIDI base+1, are monitored and acknowledged as follows:
FFh: Sets the interface into the initial condition. The interface returns to the intelligent mode.
Others: No operation.
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144
IT8702F V0.5
DC Electrical Characteristics
10. DC Electrical Characteristics
Absolute Maximum Ratings*
Applied Voltage ....................................-0.5V to 7.0V
Input Voltage (Vi)....................... -0.5V to VCC+0.5V
Output Voltage (Vo)................. -0.5V to VCC + 0.3V
Operation Temperature (Topt) ............ 0°C to +70°C
Storage Temperature .................... -55°C to +125°C
Power Dissipation ........................................ 300mW
*Comments
Stresses above those listed under "Absolute
Maximum Ratings" may cause permanent damage
to this device. These are stress ratings only.
Functional operation of this device at these or any
other conditions above those indicated in the
operational sections of this specification is not
implied or intended. Exposure to the absolute
maximum rating conditions for extended periods
may
affect
device
reliability.
DC Electrical Characteristics (VCC = 5V ± 5%, Ta = 0°C to + 70°C)
Symbol
Parameter
DO8 Buffer
VOL
Low Output Voltage
VOH
High Output Voltage
Condition
Min.
Typ.
IOL = 8 mA
IOH = -8 mA
Max.
Unit
0.4
V
2.4
V
DOD8 Buffer
VOL
Low Output Voltage
IOL = 8 mA
0.4
V
DO16 Buffer
VOL
Low Output Voltage
IOL = 16 mA
0.4
V
VOH
High Output Voltage
DO24 Buffer
VOL
Low Output Voltage
VOH
High Output Voltage
DIO8 Type Buffer
VOL
Low Output Voltage
IOH = -16 mA
V
IOL = 24 mA
IOH = -16 mA
0.4
2.4
High Output Voltage
VIL
Low Input Voltage
VIH
High Input Voltage
IIL
Low Input Leakage
VIN = 0
IIH
High Input Leakage
VIN = VCC
IOZ
3-state Leakage
IOH = -8 mA
0.4
2.4
V
V
0.8
2.2
145
V
V
IOL = 8 mA
VOH
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2.4
V
V
µA
10
-10
µA
20
µA
IT8702F V0.5
IT8702F
DC Electrical Characteristics (VCC = 5V ± 5%, Ta = 0°C to + 70°C)[cont’d]
Symbol
Parameter
DIOD8 Type Buffer
VOL
Low Output Voltage
VIL
Low Input Voltage
VIH
High Input Voltage
IIL
Low Input Leakage
IIH
High Input Leakage
Condition
Min.
Typ.
IOL = 8 mA
Unit
0.4
V
0.8
V
2.2
VIN = 0
VIN = VCC
V
3-state Leakage
DIO16 Type Buffer
VOL
Low Output Voltage
IOL = 16 mA
VOH
High Output Voltage
IOH = -16 mA
VIL
Low Input Voltage
VIH
High Input Voltage
IIL
Low Input Leakage
VIN = 0
IIH
High Input Leakage
VIN = VCC
µA
10
IOZ
-10
µA
20
µA
0.4
V
2.4
V
0.8
2.2
VOL
Low Output Voltage
VIL
Low Input Voltage
VIH
High Input Voltage
IIL
Low Input Leakage
VIN = 0
IIH
High Input Leakage
VIN = VCC
µA
10
IOL = 16 mA
-10
µA
20
µA
0.4
V
0.8
V
2.2
V
Low Output Voltage
IOL = 24 mA
VOH
High Output Voltage
IOH = -16 mA
VIL
Low Input Voltage
VIH
High Input Voltage
IIL
Low Input Leakage
VIN = 0
IIH
High Input Leakage
VIN = VCC
µA
10
IOZ
3-state Leakage
DIO24 Type Buffer
VOL
-10
µA
20
µA
0.4
V
2.4
V
0.8
2.2
Low Input Voltage
VIH
High Input Voltage
IIL
Low Input Leakage
VIN = 0
IIH
High Input Leakage
VIN = VCC
µA
10
-10
µA
20
µA
0.8
V
2.2
146
V
V
IOZ
3-state Leakage
DI Type Buffer
VIL
V
V
IOZ
3-state Leakage
DIOD16 Type Buffer
www.ite.com.tw
Max.
V
µA
10
-10
µA
IT8702F V0.5
AC Characteristics
11. AC Characteristics (VCC = 5V ± 5%, Ta = 0°C to + 70°C)
11.1 Clock Input Timings
Symbol
t1
t2
t3
t4
t5
Parameter
Min.
Clock Period when CLKIN=48 MHz
nsec
8
nsec
20
Clock High Pulse Width when CLKIN=24 MHz
t6
Clock Period when CLKIN=24 MHz
Not tested. Guaranteed by design.
1
1
1
t1 , t 4
Unit
8
1
Clock Low Pulse Width when CLKIN=24 MHz
Max.
1
Clock High Pulse Width when CLKIN=48 MHz
Clock Low Pulse Width when CLKIN=48 MHz
Typ.
1
21
22
nsec
18
nsec
18
nsec
40
42
44
nsec
Min.
Typ.
Max.
Unit
t2 ,t5
2.2V
0.8V
t3 ,t6
Figure 11-1. Clock Input Timings
11.2
LCLK (PCICLK) and LRESET Timings
Symbol
Parameter
t1
LCLK Cycle Time
28
nsec
t2
LCLK High Time
11
nsec
t3
LCLK Low Time
11
nsec
t4
LRESET# Low Pulse Width
1.5
µsec
t2
0.6VCC
t3
0.4VCC p-to-p
(minimum)
0.2VCC
t1
Figure 11-2. LCLK (PCICLK) and LRESET Timings
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147
IT8702F V0.5
IT8702F
11.3
LPC and SERIRQ Timings
Symbol
Parameter
Min.
Typ.
Max.
3
Unit
t1
Float to Active Delay
t2
Output Valid Delay
12
nsec
t3
Active to Float Delay
6
nsec
t4
Input Setup Time
9
nsec
t5
Input Hold Time
3
nsec
LCLK
nsec
t2
LPC Signals/
SERIRQ
(Output)
t3
t1
LPC Signals/
SERIRQ
(Input)
Input
Valid
t4
t5
Figure 11-3. LPC and SERIRQ Timings
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148
IT8702F V0.5
AC Characteristics
11.4
Serial Port, ASKIR, SIR and Consumer Remote Control Timings
Symbol
Parameter
Conditions
Min.
tBTN – 25
Note1
Max.
Unit
tBTN + 25
nsec
t1
Single Bit Time in Serial Port
and ASKIR
Transmitter
Receiver
tBTN – 2%
tBTN + 2%
nsec
t2
Modulation Signal Pulse Width
in ASKIR
Transmitter
950
1050
nsec
Receiver
500
t3
Modulation Signal Period in
ASKIR
Transmitter
1975
2025
nsec
Receiver
2000X(23/24)
2000X(25/24)
nsec
nsec
Transmitter, Variable (3/16) x tBTN – 25 (3/16) x tBTN + 25 nsec
t4
SIR Signal Pulse Width
Transmitter, Fixed
1.48
Receiver
1
1.78
µsec
µsec
Note 1: tBTN is the nominal bit time in Serial Port, ASKIR, and SIR. It is determined by the setting on the Baud
Rate Divisor registers.
t1
Serial Port
t2
t3
Sharp-IR
Consumer Remote
Control
t4
SIR
Figure 11-4. Serial Port, ASKIR, SIR and Consumer Remote Control Timings
11.5
Modem Control Timings
Symbol
t1
Parameter
Min.
Typ.
Float to active delay
Max.
Unit
40
nsec
CTS1#, DSR1#, DCD1#,
CTS2#, DSR2#, DCD2#
t1
Interrupt
(Internal signal)
t1
(Read MSR)
(Read MSR)
t1
RI1#, RI2#
Figure 11-5. Modem Control Timings
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149
IT8702F V0.5
IT8702F
11.6
Floppy Disk Drive Timings
Symbol
Parameter
t1
DIR# active to STEP# low
t2
STEP# active time (low)
Min.
Typ.
4X tmclk
Note1
Max.
Unit
nsec
24X tmclk
nsec
Note2
msec
t3
DIR# hold time after STEP#
tSRT
t4
STEP# cycle time
t5
INDEX# low pulse width
2X tmclk
nsec
t6
RDATA# low pulse width
40
nsec
t7
WDATA# low pulse width
tSRT
1X tmclk
msec
nsec
Note 1: tmclk is the cycle of main clock for the microcontroller of FDC. tmclk =8M/ 4M/ 2.4M/ 2M for 1M/
500K/ 300K/ 250 Kbps transfer rates respectively.
Note 2: tSRT is the cycle of the Step Rate Time. Please refer to the functional description of the SPECIFY
command of the FDC.
t3
DIR#
t2
t1
t4
STEP#
t5
INDEX#
t6
RDATA#
t7
WDATA#
Figure 11-6. Floppy Disk Drive Timings
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150
IT8702F V0.5
AC Characteristics
11.7
EPP Address or Data Write Cycle Timings
Symbol
Parameter
Min.
Typ.
Max.
Unit
50
nsec
t1
WRITE# asserted to PD[7:0] valid
t2
ASTB# or DSTB# asserted to WAIT# de-asserted
0
10
nsec
t3
WAIT# de-asserted to ASTB# or DSTB# de-asserted
65
135
nsec
t4
ASTB# or DSTB# de-asserted to WAIT# asserted
0
nsec
t5
WAIT# asserted to WRITE# de-asserted
65
nsec
t6
PD[7:0] invalid after WRITE# de-asserted
0
nsec
WRITE#
t3
t4
t6
ASTB#
DSTB#
t2
t5
WAIT#
t1
PD[ 7:0 ]
Figure 11-7. EPP Address or Data Write Cycle Timings
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151
IT8702F V0.5
IT8702F
11.8
EPP Address or Data Read Cycle Timings
Symbol
Parameter
Min.
Typ.
Max.
Unit
10
nsec
t1
ASTB# or DSTB# asserted to WAIT# de-asserted
t2
ASTB# or DSTB# asserted to PD[7:0] Hi-Z
0
nsec
t3
PD[7:0] valid to WAIT# de-asserted
0
nsec
t4
WAIT# de-asserted to ASTB# or DSTB# de-asserted
65
t5
ASTB# or DSTB# de-asserted to WAIT# asserted
0
nsec
t6
PD[7:0] invalid after ASTB# or DSTB# de-asserted
20
nsec
135
nsec
WRITE#
ASTB#
DSTB#
t1
t4
t5
WAIT#
t2
t3
t6
PD[ 7:0 ]
Figure 11-8. EPP Address or Data Read Cycle Timings
11.9
ECP Parallel Port Forward Timings
Symbol
Parameter
Min.
Typ.
Max.
Unit
50
nsec
t1
PD[7:0] and nAutoFd valid to nStrobe asserted
t2
nStrobe asserted to Busy asserted
0
t3
Busy asserted to nStrobe de-asserted
70
t4
nStrobe de-asserted to Busy de-asserted
0
t5
Busy de-asserted to PD[7:0] and nAutoFd changed
80
180
nsec
t6
Busy de-asserted to nStrobe asserted
70
170
nsec
nsec
170
nsec
nsec
PD[7:0],
nAutoFd
t1
t5
nStrobe
t2
t3
t4
t6
Busy
Figure 11-9. ECP Parallel Port Forward Timings
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152
IT8702F V0.5
AC Characteristics
11.10 ECP Parallel Port Backward Timings
Symbol
Parameter
Min.
Typ.
Max.
Unit
t1
PD[7:0] valid to nAck asserted
0
nsec
t2
nAck asserted to nAutoFd asserted
70
t3
nAutoFd asserted to nAck de-asserted
0
t4
nAck de-asserted to nAutoFd de-asserted
70
t5
nAutoFd de-asserted to PD[7:0] changed
0
nsec
t6
nAutoFd de-asserted to nAck asserted
0
nsec
170
nsec
nsec
170
nsec
PD[7:0]
t5
t1
nAck
t2
t3
t4
t6
nAutoFd
Figure 11-10. ECP Parallel Port Backward Timings
11.11 RSMRST#, PWROK1/2, and ACPI Power Control Signals Timings
Symbol
Parameter
Min.
Typ.
Max.
Unit
t1
RSMRST# de-actives delay from VCCH5V=4V
13
16
19
msec
t2
PWROK1/2 active delay from VCC5V=4V
350
400
450
msec
VCCH5V
RSMRST#
V C C H 5V = 4+ - 0.2V
<--
V C C H 5V = 3.5+ - 0.2V
t1
-->
Figure 11-11. RSMRST# Timings
VCC5V
RESETCON#
PW ROK1/2
PSON#
VCC5V=4+- 0.2V
<--
VCC5V=3.5+- 0.2V
t2
-->
Figure 11-12. PWROK1/2 Timings
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IT8702F V0.5
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IT8702F V0.5
Package Information
12. Package Information
QFP 128L Outline Dimensions
unit: inches/mm
D
D1
102
65
B
64
103
WITH PLATING
E
E1
C
BASE
METAL
DETAIL "A"
128
39
1
e
38
B
A2
A
SEE DETAIL "F"
GAGE PLANE
D
A1
θ
y
SEATING PLANE
L
0.10 y
L1
DETAIL "A"
DETAIL "F"
Symbol
A
A1
A2
B
C
D
D1
E
E1
Dimension in inch
Min. Nom. Max.
0.134
0.010
0.107 0.112 0.117
0.007 0.009 0.011
0.004
0.008
0.906 0.913 0.921
0.783 0.787 0.791
0.669 0.677 0.685
0.547 0.551 0.555
Dimension in mm
Min. Nom. Max.
3.40
0.25
2.73 2.85 2.97
0.17 0.22 0.27
0.09
0.20
23.00 23.20 23.40
19.90 20.00 20.10
17.00 17.20 17.40
13.90 14.00 14.10
0.020 BSC
0.5 BSC
e
L
0.029 0.035 0.041 0.73 0.88 1.03
L1
0.063 BSC
1.60 BSC
y
0.004
0.10
θ
0°
7°
0°
7°
Notes:
1. Dimensions D1 and E1 do not include mold protrusion,
but mold mismatch is included.
2. Dimension B does not include dambar protrusion.
3. Controlling dimension: millimeter.
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IT8702F V0.5
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IT8702F V0.5
Ordering Information
13. Ordering Information
Part No.
Package
IT8702F
128 QFP
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157
IT8702F V0.5