TI TLC34075-85

TLC34075
Video Interface Palette
Data Manual
SLAS044A
January 1994
IMPORTANT NOTICE
Texas Instruments (TI) reserves the right to make changes to or to discontinue
any semiconductor product or service identified in this publication without notice.
TI advises its customers to obtain the latest version of the relevant information to
verify, before placing orders, that the information being relied upon is current.
TI warrants performance of its semiconductor products to current specifications
in accordance with TI’s standard warranty. Testing and other quality control
techniques are utilized to the extent TI deems necessary to support this warranty.
Unless mandated by government requirements, specific testing of all parameters
of each device is not necessarily performed.
TI assumes no liability for TI applications assistance, customer product design,
software performance, or infringement of patents or services described herein.
Nor does TI warrant or represent that license, either express or implied, is granted
under any patent right, copyright, mask work right, or other intellectual property
right of TI covering or relating to any combination, machine, or process in which
such semiconductor products or services might be or are used.
Texas Instruments products are not intended for use in life-support appliances,
devices, or systems. Use of a TI product in such applications without the written
consent of the appropriate TI officer is prohibited.
D3643, MAY 1991
Copyright  1991, Texas Instruments Incorporated
Printed in the U.S.A.
Contents
Section
Title
Page
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1.2 Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
1.3 Terminal Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
1.4 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
1.5 Terminal Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4
2.2 Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
2.1 MPU Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
2.2 Color Palette RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
2.2.1 Writing to the Color Palette RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
2.2.2 Reading From the Color Palette RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
2.2.3 Palette Page Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
2.3 Input/Output Clock Selection and Generatio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
2.3.1 SCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
2.3.2 VCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2.4 Multiplixing Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7
2.4.1 VGA Pass-Through Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7
2.4.2 Multiplexing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
2.4.3 True Color Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
2.4.4 Special Nibble Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
2.4.5 Multiplex Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
2.4.6 Read Masking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
2.5 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
2.5.1 Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
2.5.2 Hardware Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
2.5.3 Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
2.5.4 VGA Pass-Through Mode Default Conditions . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
2.6 Frame Buffer Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12
2.7 Analog Output Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12
2.8 HSYNC, VSYNC, and BLANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14
2.9 Split Shift Register Transfer VRAMs and Special Nibble Mode . . . . . . . . . . . . . . . . . . 2–14
2.9.1 Split Shift Register Transfer VRAMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14
2.9.2 Special Nibble Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–15
2.10 MUXOUT Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
2.11 General Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
2.11.1 HSYNCOUT and VSYNCOUT (Bits 0 and 1) . . . . . . . . . . . . . . . . . . . . . . . . . 2–17
2.11.2 Split Shift Register Transfer Enable (SSRT) and Special Nibble Mode
Enable (SNM) (Bits 2 and 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17
1
Contents (Continued)
Section
Title
Page
2.11.3 Pedestal Enable Control (Bit 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17
2.11.4 Sync Enable Control (Bit 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17
2.11.5 MUXOUT (Bit 7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17
2.12 Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–18
2.12.1 Frame Buffer Data Flow Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19
2.12.2 Identification Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19
2.12.3 Ones Accumulation Screen Integrity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19
2.12.4 Analog Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19
3.1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3.1 Absolute Maximum Ratings Over Operating Free-Air Temperature Range
(Unless Otherwise Noted) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3.2 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3.3 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
3.4 Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
3.5 Timing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4
3.6 Switching Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5
TL34075-66, TLC34075-85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5
TL34075-110, TLC34075-135 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6
3.7 Timing Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7
Appendix A SCLK/VCLK and the TMS340x0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1
Appendix B PC Board Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–1
Appendix C SCLK Frequency < VCLK Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–1
Appendix D Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D–1
2
List of Illustrations
Figure
1–1
1–2
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
2–9
2–10
2–11
2–12
3–1
3–2
3–3
B–1
B–2
B–3
C–1
C–2
Title
Page
Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
Terminal Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
DOTCLK/VCLK/SCLK Relationship . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
SCLK/VCLK Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
SCLK/VCLK Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
SCLK/VCLK Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
SCLK/VCLK Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7
Equivalent Circuit of the IOG Current Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12
7.5-IRE, 8-Bit Composite Video Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13
0-IRE, 8-Bit Composite Video Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13
Relationship Between SFLAG/NFLAG, BLANK, and SCLK . . . . . . . . . . . . . . . . . . . . . . 2–15
SFLAG/NFLAG Timing in Special Nibble Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
Test Register Control Word State Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–18
Internal Comparator Circuitry for Analog Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–20
MPU Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7
Video Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
SFLAG/NFLAG Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
Typical Connection Diagram and Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . App B
Typical Component Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . App B
Typical Split Power Plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . App B
VCLK and SCLK Phase Relationship (Case 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . App C
VCLK and SCLK Phase Relationship (Case 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . App C
List of Tables
Table
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
2–9
2–10
2–11
Title
Internal Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Allocation of Palette Page Register Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Clock Selection Register Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Clock Selection Register Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCLK/SCLK Divide Ratio Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mode and Bus Width Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pixel Data Distribution in Special Nibble Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Control Register Bit Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Register Bit Definitions for Analog Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D<7:4> Bit Coding for Analog Comparisons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page
2–1
2–2
2–3
2–4
2–4
2–9
2–15
2–17
2–18
2–20
2–20
3
4
1 Introduction
The TLC34075 Video Interface Palette (VIP) is designed to provide lower system cost with a higher level
of integration by incorporating all the high-speed timing, synchronizing, and multiplexing logic usually
associated with graphics systems into one device, thus greatly reducing chip count. Since all high-speed
signals (excluding the clock source) are contained on-chip, RF noise considerations are simplified.
Maximum flexibility is provided through the pixel multiplexing scheme, which allows for 32-, 16-, 8-, and 4-bit
pixel buses to be accommodated without any circuit modification. This enables the system to be easily
reconfigured for varying amounts of available video RAM. Data can be split into 1, 2, 4, or 8 bit planes. The
TLC34075 is software-compatible with the INMOS IMSG176/8 and Brooktree BT476/8 color palettes.
The TLC34075 features a separate VGA bus that allows data from the feature connector of most
VGA-supported personal computers to be fed directly into the palette without the need for external data
multiplexing. This allows a replacement graphics board to remain downward compatible by utilizing the
existing graphics circuitry often located on the motherboard. The TLC34075 also provides a true color mode
in which 24 (3 by 8) bits of color information are transferred directly from the pixel port to the DACs. This
mode of operation supplies an overlay function using the 8 remaining bits of the pixel bus.
The TLC34075 has a 256-by-24 color lookup table with triple 8-bit video D/A converters capable of directly
driving a doubly terminated 75-Ω line. Sync generation is incorporated on the green output channel. HSYNC
and VSYNC are fed through the device and optionally inverted to indicate screen resolution to the monitor.
A palette page register provides the additional bits of palette address when 1, 2, or 4 bit planes are used.
This allows the screen colors to be changed with only one MPU write cycle.
Clocking is provided through one of four or five inputs (3 TTL- and either 1 ECL- or 2 TTL-compatible) and
is software selectable. The video and shift clock outputs provide a software-selected divide ratio of the
chosen clock input.
The TLC34075 can be connected directly to the serial port of VRAM devices, eliminating the need for any
discrete logic. Support for split shift register transfers is also provided.
1.1 Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Versatile multiplexing interface allows lower pixel bus rate
High level of integration provides lower system cost and complexity
Direct VGA pass-through capability
Directly interfaces to TMS34010/TMS34020 and other graphics processors
Triple 8-bit D/A converters
66-, 85-, 110-, and 135-MHz versions
256-word color palette RAM
Palette page register
On-chip voltage reference
RS-343A-compatible outputs
TTL-compatible inputs
Standard MPU interface
Pixel word mask
On-chip clock selection
True color (direct addressing) mode
Directly interfaces to video RAM
Supports split shift register transfers
Software downward-compatible with INMOS IMSG176/8 and Brooktree BT476/8 color palettes
1–1
•
TIGA-software-standard compatible
•
LinEPIC 1-µm CMOS process
1.2 Functional Block Diagram
LinEPIC and TIGA are trademarks of Texas Instruments Incorporated.
1–2
True Color
Pipeline Delay
24
8
V REF
FS ADJ.
32
24
COMP
8
P<0:31>
8
32
4
32
Input
Latch
VGA<0:7>
32
32
8
8
32
Read
Mask
8
8
Color
Palette
RAM
2
8
7
8
D<0:7>
4
RS<0:3>
RD
WR
Page
Register
1
32
8
Output
MUX
8
8
8
DAC
IOR
DAC
IOG
DAC
IOB
8 8 8
Test
Register
6
24
MPU
Registers
& Control
Video MUX
& Control
8
HSYNCOUT
VSYNCOUT
MUXOUT
Clock
Control
VGABLANK
BLANK
VSYNC
HSYNC
8/6
VCLK
SCLK
CLK3
CLK<0:3>
SFLAG/
NFLAG
1–3
Figure 1. Functional Block Diagram
11 10 9
P17
P16
P15
P14
P13
P12
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
WR
RD
RS0
8
7 6 5 4
3
2
VCLK
CLK0
CLK1
CLK2
P18
P19
P20
P21
P22
P23
P24
P25
P26
P27
P28
P29
P30
P31
VDD
GND
SCLK
1.3 Terminal Assignments
1 84 83 82 81 80 79 78 77 76 75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
CLK3
CLK3
VGA7
VGA6
VGA5
VGA4
VGA3
VGA2
VGA1
VGA0
8/6
MUXOUT
SFLAG/NFLAG
VGABLANK
BLANK
VSYNC
HSYNC
VDD
GND
VDD
GND
HSYNCOUT
VSYNCOUT
IOR
IOG
IOB
FS ADJUST
COMP
VREF
RS1
RS2
RS3
D0
D1
D2
D3
D4
D5
D6
D7
GND
VDD
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
Figure 2. Terminal Assignments
1.4 Ordering Information
TLC34075
Pixel clock frequency indicator
MUST CONTAIN TWO OR THREE CHARACTERS:
– 66:
66-MHz pixel clock
– 85:
85-MHz pixel clock
– 110: 110-MHz pixel clock
– 135: 135-MHz pixel clock
Package
MUST CONTAIN TWO LETTERS:
FN: plastic, square, leaded chip carrier (formed leads)
1–4
–
(X)XX
FN
1.5 Terminal Functions
PIN NAME
NO.
I/O
DESCRIPTION
BLANK,
VGABLANK
60, 61
I
Blanking inputs. Two blanking inputs are provided in order to remove any
external multiplexing of the signals that may cause data and blank to skew.
When the VGA pass-through mode is set in the mux control register, the
VGABLANK input is used for blanking; otherwise, BLANK is used.
CLK<0:2>
77, 76, 75
I
Dot clock inputs. Any of the three clocks can be used to drive the dot clock
at frequencies up to 85 MHz. When VGA pass-through mode is active, CLK0
is used by default.
CLK3, CLK3
74, 73
I
Dual-mode dot clock input. This input is an ECL-compatible input, but a TTL
clock may be used on either CLK3 or CLK3 if so selected in the input clock
selection register. This input may be selected as the dot clock for any
frequency of operation up to the device limit while in the ECL mode; it may only
be used up to 85 MHz in the TTL mode.
COMP
52
I
Compensation input. This terminal provides compensation for the internal
reference amplifier. A resistor and ceramic capacitor are required between
this terminal and VDD. The resistor and capacitor must be as close to the
device as possible to avoid noise pickup. Refer to Appendix B for more
details.
D<0:7>
36 – 43
I/O
MPU interface data bus. Used to transfer data in and out of the register map
and palette/overlay RAM.
FS ADJUST
51
I
Full-scale adjustment pin. A resistor connected between this pin and ground
controls the full-scale range of the DACs.
GND
44, 54,
56, 80
HSYNCOUT,
VSYNCOUT
46, 47
O
Horizontal and vertical sync outputs of the true/complement gate mentioned
in the HSYNC, VSYNC description below (see Section 2.8).
HSYNC, VSYNC
58, 59
I
Horizontal and vertical sync inputs. These signals are used to generate the
sync level on the green current output. They are active-low inputs for the
normal modes and are passed through a true/complement gate. For the VGA
pass-through mode, they are passed through to HSYNCOUT and
VSYNCOUT without polarity change as specified by the control register (see
Section 2.8).
IOR, IOG, IOB
48, 49, 50
O
Analog current outputs. These outputs can drive a 37.5-Ω load directly
(doubly terminated 75-Ω line), thus eliminating the need for any external
buffering.
MUXOUT
63
O
MUX output control. This output pin is software programmable. It is set low
to indicate to external devices that VGA pass-through mode is being used
when the MUX control register value is set to 2Dh. If bit 7 of the general control
register is set high after the mode is set, this output goes high. This pin is only
used for external control; it affects no internal circuitry.
P<0:31>
29 –1,
84 – 82
I
Pixel input port. This port can be used in various modes as shown in the MUX
control register. It is recommended that unused pins be tied to ground to lower
the device’s power consumption.
RD
31
I
Read strobe input. A low logic level on this pin initiates a read from the
TLC34075 register map. Reads are performed asynchronously and are
initiated on the falling edge of RD (see Figure 3 –1).
RS<0:3>
32–35
I
Register select inputs. These pins specify the location in the register map that
is to be accessed, as shown in Table 2–1.
SCLK
79
O
Shift clock output. This output is selected as a submultiple of the dot clock
input. SCLK is gated off during blanking.
Ground. All GND pins must be connected. The analog and digital GND pins
are connected internally.
1–5
I/O
DESCRIPTION
SFLAG/NFLAG
PIN NAME
62
NO.
I
Split shift register transfer flag or nibble flag input. This pin has two functions.
When the general control register bit 3 = 0 and bit 2 = 1, split shift register
transfer function is enabled and a low-to-high transition on this pin during a
blank sequence initiates an extra SCLK cycle to allow a split shift register
transfer in the VRAMs. When the general control register bit 3 = 1 and
bit 2 = 0, special nibble mode is enabled and this input is sampled at the falling
edge of VCLK. A high value sampled indicates that the next SCLK rising edge
should latch the high nibble of each byte of the pixel data bus; a low value
sampled indicates that the low nibble of each byte of the pixel data bus should
be latched (see Section 2.9). When the general control register bit 3 = 0 and
bit 2 = 0, this pin is ignored. The condition of bit 3 = 1, bit 2 = 1 is not allowed,
and device operation is unpredictable if they are so set.
VCLK
78
O
Video clock output. User-programmable output for synchronization of the
TLC34075 to a graphics processor.
VDD
45, 55,
57, 81
VGA<0:7>
65 – 72
VREF
53
WR
30
I
Write strobe input. A low logic level on this pin initiates a write to the TLC34075
register map. Write transfers are asynchronous. The data written to the
register map is latched on the rising edge of WR (see Figure 3–1).
8/6
64
I
DAC resolution selection. This pin is used to select the data bus width (8 or
6 bits) for the DACs and is provided to maintain compatibility with the INMOS
IMSG176/8 color palette. When this pin is at a high logic level, 8-bit bus
transfers are used, with D<7> being the MSB and D<0> the LSB. For 6-bit bus
operation, while the color palette still has the 8-bit information, D<5> shifts to
the bit 7 position, D<0> shifts to the bit 2 position, and the two LSBs are filled
with zeros at the output MUX to the DAC. When read in the 6-bit mode, the
palette-holding register zeroes out the two MSBs.
Power. All VDD pins must be connected. The analog and digital VDD pins are
connected internally.
I
VGA pass-through bus. This bus can be selected as the pixel bus for VGA
pass-through mode. It does not allow for any multiplexing.
Voltage reference for DACs. An internal voltage reference of nominally
1.235 V is designed in. A 0.1-µf ceramic capacitor between this terminal and
GND is recommended for noise filtering using either the internal or an external
reference voltage. The internal reference voltage can be overridden by an
externally supplied voltage. The typical connection is shown in Appendix B.
NOTES: 1. Although leaving unused pins floating will not adversely affect device operation, tying unused pins to ground
lowers power consumption and, thus, is recommended.
2. All digital inputs and outputs are TTL-compatible, unless otherwise noted.
1–6
2 Detailed Description
2.1 MPU Interface
The processor interface is controlled via read and write strobes (RD, WR), four register select pins
(RS<0:3>), and the 8/6 select pin. The 8/6 select pin is used to select between 8- or 6-bit operation and is
provided in order to maintain compatibility with the IMSG176/8 color palette. This operation is carried out
in order to utilize the maximum range of the DACs.
The internal register map is shown in Table 1. The MPU interface operates asynchronously, with data
transfers being synchronized by internal logic. All the register locations support read and write operations.
Table 1. Internal Register Map
RS3
RS2
RS1
RS0
L
L
L
L
Palette address register – write mode
REGISTER ADDRESSED BY MPU
L
L
L
H
Color palette holding register
L
L
H
L
Pixel read mask
L
L
H
H
Palette address register – read mode
L
H
L
L
Reserved
L
H
L
H
Reserved
L
H
H
L
Reserved
L
H
H
H
Reserved
H
L
L
L
General control register
H
L
L
H
Input clock selection register
H
L
H
L
Output clock selection register
H
L
H
H
Mux control register
H
H
L
L
Palette page register
H
H
L
H
Reserved
H
H
H
L
Test register
H
H
H
H
Reset state
2.2 Color Palette RAM
The color palette RAM is addressed by two internal 8-bit registers, one for reading from the RAM and one
for writing to the RAM. These registers are automatically incremented following a RAM transfer, allowing
the entire palette to be read/written with only one access of the address register. When the address register
increments beyond the last location in RAM, it is reset to the first location (address 0). Although all read and
write accesses to the RAM are asynchronous to SCLK, VCLK, and the dot clock, they are performed within
one dot clock and so do not cause any noticeable disturbance on the display.
The color palette RAM is 24 bits wide for each location (8 bits each for red, green, and blue). If 6-bit mode
is chosen (8/6 = low), the two MSBs are still written to the color palette RAM. However, if they are read back
in the 6-bit mode, the two MSBs are set to 0 to maintain compatibility with the IMSG176/8 and BT476/8 color
palettes. The output MUX shifts the six LSBs to the six MSB positions, fills the two LSBs with 0s, then feeds
the eight bits to the DAC. With the 8/6 pin held low, data on the lowest six bits of the data bus are internally
shifted up by two bits to occupy the upper six bits at the output MUX, and the bottom two bits are then zeroed.
The test register and the ones accumulation register both take data before the output MUX to give the user
the maximum flexibility.
The color palette RAM access methodology is described in the following two sections and is fully compatible
with the IMSG176/8 and BT476/8 color palettes.
2–1
2.2.1
Writing to the Color Palette RAM
To load the color palette RAM, the MPU must first write to the address register (write mode) with the address
where the modification is to start. This action is followed by three successive writes to the palette-holding
register with eight bits each of red, green, and blue data. After the blue data write cycle, the three bytes of
color are concatenated into a 24-bit word and written to the color palette RAM location specified by the
address register. The address register then increments to point to the next color palette RAM location, which
the MPU may modify by simply writing another sequence of red, green, and blue data bytes. A block of color
values in consecutive locations may be written to by writing the start address and performing continuous
red, green, and blue write cycles until the entire block has been written.
2.2.2
Reading From the Color Palette RAM
Reading from the color palette RAM is performed by writing the location to be read to the address register.
This action initiates a transfer from the color palette RAM into the holding register followed by an increment
of the address register. Three successive MPU reads from the holding register produce red, green, and blue
color data (six or eight bits, depending on the 8/6 mode) for the specified location. Following the blue read
cycle, the contents of the color palette RAM at the address specified by the address register are copied into
the holding register and the address register is again incremented. As with writing to the color palette RAM,
a block of color values in consecutive locations may be read by writing the start address and performing
continuous red, green, and blue read cycles until the entire block has been read.
2.2.3
Palette Page Register
The 8-bit palette page register provides high-speed color changing by removing the need for color palette
RAM reloading. When using 1, 2, or 4 bit planes, the additional planes are provided by the palette page
register; e.g., when using four bit planes, the pixel inputs specify the lower four bits of the color palette RAM
address with the upper four bits being specified by the palette register. This provides the capability of
selecting from 16 palette pages with only one chip access, thus allowing all the screen colors to be changed
at the line frequency. A bit-to-bit correspondence is used; therefore, in the above configuration, palette page
register bits 7 through 4 map onto color palette RAM address bits 7 through 4, respectively. This is illustrated
below.
NOTE: The additional bits from the palette page register are inserted before the read mask and hence, are
subject to masking.
Table 2. Allocation of Palette Page Register Bits
NUMBER OF
BIT PLANES
msb
COLOR PALETTE RAM ADDRESS BITS
8
M
M
M
M
M
M
M
M
4
P7
P6
P5
P4
M
M
M
M
2
P7
P6
P5
P4
P3
P2
M
M
1
P7
P6
P5
P4
P3
P2
P1
M
isb
Pn = nth bit from palette page register
M = bit from pixel port
2.3 Input/Output Clock Selection and Generation
The TLC34075 provides a maximum of five clock inputs. Three are dedicated to TTL inputs; the other two
can be selected as either one ECL input or two extra TTL inputs. The TTL inputs can be used for video rates
up to 85 MHz, above which an ECL clock source must be used (although the ECL clock may also be used
at lower frequencies). The dual-mode clock input (ECL/TTL) is primarily an ECL input but can be used as
a TTL-compatible input if the input clock selection register is so programmed. The clock source used at
power-up is CLK0; an alternative source can be selected by software during normal operation. This chosen
clock input is used unmodified as the dot clock (representing the pixel rate to the monitor). The device does,
2–2
however, allow for user programming of the SCLK and VCLK outputs (shift and video clocks) via the output
clock selection register. The input/output clock selection registers are shown in Tables 5, 6, and 7.
SCLK is designed to drive the VRAMs directly, and VCLK is designed to work with video control signals such
as BLANK and the SYNCs. While SCLK and VCLK are designed as general-purpose shift clock and video
clock, respectively, they also interface directly with the TMS340x0 GSP family. While SCLK and VCLK can
be selected independently, there is still a relationship between the two. Internally, both SCLK and VCLK are
generated from a common clock counter that increments on the rising edge of the DOTCLK. When VCLK
is enabled and the VCLK and SCLK frequencies are programmed to be the same submultiple of the
DOTCLK frequency, then VCLK and SCLK are in phase. When VCLK is enabled and the VCLK and SCLK
frequencies are programmed to be different submultiples of the DOTCLK frequency, then there are
simultaneous rising edges on the two waveforms at times determined by their frequency ratio
(see Figure 3).
Appendix A discusses the SCLK/VCLK relationship specific to the TMS340x0 GSP.
DOTCLK
VCLK
(DOTCLK/4
as an example)
SCLK
(DOTCLK/2
as an example)
Figure 3. DOTCLK/VCLK/SCLK Relationship
Table 3. Input Clock Selection Register Format
BITS†
FUNCTION ‡
3
2
1
0
0
0
0
0
Select CLK0 as clock source§
0
0
0
1
Select CLK1 as clock source
0
0
1
0
Select CLK2 as clock source
0
0
1
1
Select CLK3 as TTL clock source
0
1
0
0
Select CLK3 as TTL clock source
1
0
0
0
Select CLK3 and CLK3 as ECL clock sources
† Register bits 4, 5, 6, and 7 are don’t care bits.
‡ When the clock selection is altered, a minimum 30-ns delay is incurred before the
new clocks are stabilized and running.
§ CLK0 is chosen at power-up to support the VGA pass-through mode.
2–3
Table 4. Output Clock Selection Register Format
BITS †
FUNCTION ‡
5
4
3
2
1
0
0
0
0
X
X
X
VCLK frequency = DOTCLK frequency
0
0
1
X
X
X
VCLK frequency = DOTCLK frequency/2
0
1
0
X
X
X
VCLK frequency = DOTCLK frequency/4
0
1
1
X
X
X
VCLK frequency = DOTCLK frequency/8
1
0
0
X
X
X
VCLK frequency = DOTCLK frequency/16
1
0
1
X
X
X
VCLK frequency = DOTCLK frequency/32
1
1
X
X
X
X
VCLK output held at logic high level (default condition)§
X
X
X
0
0
0
SCLK frequency = DOTCLK frequency
X
X
X
0
0
1
SCLK frequency = DOTCLK frequency/2
X
X
X
0
1
0
SCLK frequency = DOTCLK frequency/4
X
X
X
0
1
1
SCLK frequency = DOTCLK frequency/8
X
X
X
1
0
0
SCLK frequency = DOTCLK frequency/16
X
X
X
1
0
1
SCLK frequency = DOTCLK frequency/32
X
X
X
1
1
X
SCLK output held at logic level low (default condition)§
† Register bits 6 and 7 are don’t care bits.
‡ When the clock selection is altered, a minimum 30-ns delay is incurred before the new clocks are
stabilized and running.
§ These lines indicate the power-up conditions required to support the VGA pass-through mode.
Table 5. VCLK/SCLK Divide Ratio Selection
(Output Clock Selection Register Value in Hex)
SCLK
VCLK
BITS
5. . .3¶
000
BITS
2. . . 0¶
divide DOTCLK by
divide
DOTCLK
by 1
001
010
011
100
101
1
2
4
8
16
32
00
01
02
03
04
05
001
2
08
09
0A
0B
0C
0D
010
4
10
11
12
13
14
15
011
8
18
19
1A
1B
1C
1D
100
16
20
21
22
23
24
25
28
29
2A
2B
2C
2D
101
32
¶ Output clock selection register bits
2.3.1
000
SCLK
The TLC34075 latches data on the rising edge of the LOAD signal (LOAD is the same as SCLK but is not
disabled while the BLANK signal is active). Therefore, SCLK must be set as a function of the pixel bus width
and the number of bit planes. The SCLK frequency can be selected to be the same as the dot clock
frequency or 1/2, 1/4, 1/8, 1/16, or 1/32 of the dot clock frequency. If SCLK is not used, the output is switched
off and held low to protect against VRAM lock-up due to invalid SCLK frequencies. SCLK is also held low
during the BLANK signal active period. The control timing has been designed to bring the first pixel data
ready from the VRAM when BLANK is disabled and ready for the display. When split shift register transfer
operation is used, SCLK is taken care of by working with SSRT input (see Section 2.9).
Refer to Figure 2– 2 for the following timing explanation.
2–4
The falling edge of VCLK is used internally by the TLC34075 to sample and latch the BLANK input level.
When BLANK goes low, SCLK is disabled as soon as possible. In other words, if the last SCLK pulse is at
the high level while the sampled BLANK is low, SCLK is allowed to finish its cycle to low level, then SCLK
is held low until the sampled BLANK goes back high to enable it again. The VRAM shift register should be
updated during the BLANK active period, and the first SCLK pulse is used to clock the first valid pixel data
from the VRAM. The internal pipeline delay of the BLANK input is designed to be in phase with data at the
DAC output to the monitors. The logic described above works in situations wherein the SCLK period is
shorter than, equal to, or longer than the VCLK period.
Figure 5 shows the case wherein the SSRT (split shift register transfer) function is enabled. One SCLK pulse
with a minimum width of 15 ns is generated from the rising edge at the SFLAG input with specified delay.
This is designed to meet the VRAM timing requirement, and this SCLK pulse replaces the first SCLK in the
regular shift register transfer case as described above. Refer to Section 2.9 for the detailed explanation of
the SSRT function.
The SCLK output waveform may vary at the time that the sampled BLANK input is low. Refer to Appendix C
for details.
2.3.2
VCLK
The VCLK frequency can be selected to be 1/1, 1/2, 1/4, 1/8, 1/16, or 1/32 of that of the dot clock, or it can
be held at a high logic level. The default condition is for VCLK to be held at a high logic level. VCLK is not
used in VGA pass-through mode.
VCLK is used by a GSP or custom-designed control logic to generate control signals (BLANK, HSYNC, and
VSYNC). As can be seen from Figures 4, 5, 6, and 7, since the control signals are sampled by VCLK, it is
obvious that VCLK has to be enabled.
VCLK
BLANK
at Input Pin
Latch Last Group
of Pixel Data
Latch First Group
of Pixel Data
Latch Last Group
of Pixel Data
LOAD
(Internal Signal
for Data Latch)
BLANK
(Internal Signal
Before DOTCLK
Pipeline Delay)
PIXEL DATA
at Input Pin
2nd
4th
1st Group 3rd Group 5th
Group
Group
Group
6th
Group
Last Group of Pixel Data
SCLK
NOTE: Either the SSRT function is disabled (general control register bit 2 = 0), or the SFLAG/NFLAG input is held low
if the SSRT function is enabled (general control register bit 2 = 1).
Figure 4. SCLK/VCLK Control Timing (SSRT Disabled,
SCLK Frequency = VCLK Frequency)
2–5
VCLK
BLANK
at Input Pin
SFLAG/NFLAG
Latch Last Group
of Pixel Data
Latch First Group
of Pixel Data
Latch Last Group
of Pixel Data
LOAD
(Internal Signal
for Data Latch)
BLANK
(Internal Signal
Before DOTCLK
Pipeline Delay)
PIXEL DATA
at Input Pin
3rd
5th
2nd Group 4th Group
Group
Group
Last
Group
6th
Group
1st Group of Pixel Data
SCLK Between Split Shift Register Transfer
and Regular Shift Register Transfer
SCLK
NOTE:The SSRT function is enabled (general control register bit 2 = 1).
Figure 5. SCLK/VCLK Control Timing (SSRT Enabled,
SCLK Frequency = VCLK Frequency)
VCLK
BLANK
at Input Pin
Latch Last Group
of Pixel Data
Latch First Group
of Pixel Data
LOAD
(Internal Signal
for Data Latch)
BLANK
(Internal Signal
Before DOTCLK
Pipeline Delay)
PIXEL DATA
at Input Pin
2nd
4th
6th
1st Group 3rd Group 5th
Group
Group
Group
Group
Last Group of Pixel Data
SCLK
Figure 6. SCLK/VCLK Control Timing (SSRT Disabled,
SCLK Frequency = 4 × VCLK Frequency)
2–6
NOTE: Either the SSRT function is disabled (general control register bit 2 = 0), or the SFLAG/NFLAG input is held low
if the SSRT function is enabled (general control register bit 2 = 1).
VCLK
BLANK
at Input Pin
SFLAG/NFLAG
Latch Last Group
of Pixel Data
Latch First Group
of Pixel Data
LOAD
(Internal Signal
for Data Latch)
BLANK
(Internal Signal
Before DOTCLK
Pipeline Delay)
3rd
5th
2nd Group 4th Group 6th
Group
Group
Group
Last
Group
PIXEL DATA
at Input Pin
1st Group of Pixel Data
SCLK Between Split Shift Register
and Regular Shift Register Transfer
SCLK
Figure 7. SCLK/VCLK Control Timing (SSRT Enabled,
SCLK Frequency = 4 × VCLK Frequency)
2.4 Multiplexing Scheme
The TLC34075 offers a highly versatile multiplexing scheme as illustrated in Table 6. The on-chip
multiplexing allows the system to be reconfigured to the amount of RAM available. For example, if only
256K bytes of memory are available, an 800-by-600 mode with 4 bit planes (four bits per pixel) could be
implemented using an 8-bit-wide pixel bus. If, at a later date, another 256K bytes are added to another eight
bits of the pixel bus, the user has the option of using 8 bit planes at the same resolution or 4 bit planes at
a 1024-by-768 resolution. When an additional 512K bytes is added to the remaining 16 bits of the pixel bus,
the user has the option of 8 bit planes at 1024-by-768 or 4 bit planes at 1280 by 1024. All the above can
be achieved without any hardware modification and without any increase in the speed of the pixel bus.
2.4.1
VGA Pass-Through Mode
Mode 0, the VGA pass-through mode, is used to emulate the VGA modes of most personal computers. The
advantage of this mode is that the TLC34075 can take data presented on the feature connectors of most
VGA-compatible PC systems into the device on a separate bus, thus requiring no external multiplexing. This
feature is particularly useful for systems in which the existing graphics circuitry is on the motherboard. In
this instance, it enables implementation of a drop-in graphics card that maintains compatibility with all
existing software by using the on-board VGA circuitry but routing the emerging bit-plane data through the
TLC34075. This is the default mode at power-up. When the VGA pass-through mode is selected after the
device is powered up, the clock selection register, the general control register, and the pixel read mask
register are set to their default states automatically.
Since this mode is designed with the feature connector philosophy, all the timing is referenced to CLK0,
which is used by default for VGA pass-through mode. For all the other normal modes, CLK <0:3> are the
oscillator sources for DOTCLK, VCLK, and SCLK; all the data and control timing is referenced to SCLK.
2–7
2.4.2
Multiplexing Modes
In addition to the VGA pass-through mode, there are four multiplexing modes available, all of which are
referred to as normal modes. In each normal mode, a pixel bus width of 8, 16, or 32 bits may be used. Modes
1, 2, and 3 also support a pixel bus width of 4 bits. Data should always be presented on the least significant
bits of the pixel bus. For example, when a 16-bit-wide pixel bus is used and there are 8 bits per pixel, each
8-bit pixel should be presented on P<0:7>. All the unused pixel bus pins should be connected to GND.
Mode 1 uses a single bit plane to address the color palette. The pixel port bit is fed into bit 0 of the palette
address, with the 7 high-order address bits being defined by the palette page register (see Section 2.2.3).
This mode has uses in high-resolution monochrome applications such as desktop publishing. This mode
allows the maximum amount of multiplexing (a 32:1 ratio), thus giving a pixel bus rate of only 4 MHz at a
screen resolution of 1280 by 1024. Although only a single bit plane is used, alteration of the palette page
register at the line frequency allows 256 different colors to be displayed simultaneously with 2 colors per
line.
Mode 2 uses 2 bit planes to address the color palette. The 2 bits are fed into the low-order address bits of
the palette with the 6 high-order address bits being defined by the palette page register (see Section 2.2.3).
This mode allows a maximum divide ratio of 16:1 on the pixel bus and is a 4-color alternative to mode 1.
Mode 3 uses 4 bit planes to address the color palette. The 4 bits are fed into the low-order address bits of
the palette with the 4 high-order address bits being defined by the palette page register (see Section 2.2.3).
This mode provides 16 pages of 16 colors and can be used at SCLK divide ratios of 1 to 8.
Mode 4 uses 8 bit planes to address the color palette. Since all 8 bits of palette address are specified from
the pixel port, the page register is not used. This mode allows dot-clock-to-SCLK ratios of 1:1 (8-bit bus),
2:1 (16-bit bus) or 4:1 (32-bit bus). Therefore, in a 32-bit configuration, a 1024-by-768 pixel screen can be
implemented with an external data rate of only 16 MHz.
2.4.3
True Color Mode
Mode 5 is true color mode, in which 24 bits of data are transferred from the pixel port directly to the DACs
with the same amount of pipeline delay as the overlay data and the control signals (BLANK and SYNCs).
In this mode, overlay is provided by using the remaining 8 bits of the pixel bus to address the palette RAM,
resulting in a 24-bit RAM output that is then used as overlay information to the DACs. When all the overlay
inputs (P<0:7>) are at a low logic level or the pixel read mask register is loaded with the value 0, no overlay
information is displayed; when a nonzero value is input with the pixel read mask enabled, the color palette
RAM is addressed and the resulting data is then fed through to the DACs, receiving priority over the true
color data.
The true-color-mode data input only works in the 8-bit mode. In other words, if only 6 bits are used, the 2
MSB inputs for each color should be tied to GND. However, the palette, which is used by the overlay input,
is still governed by the 8/6 input pin, and the output MUX selects 8 bits of data or 6 bits of data accordingly.
In the true color mode, P<15:8> pass red data, P<23:16> pass green data, and P<31:24> pass blue data.
2.4.4
Special Nibble Mode
Mode 6 is special nibble mode, which is enabled when the general control register SNM bit (bit 3) is set to
1 and the general control register SSRT bit (bit 2) is set to 0 (see Section 2.11). When special nibble mode
is enabled, it takes precedence over the other modes, and the mux control register setup is ignored. The
SFLAG/NFLAG input is then used as a nibble flag to indicate which nibble of each byte holds the pixel data.
Special nibble mode is a variation of the 4-bit pixel mode with a 16-bit pixel width. All 32 inputs (P0 through
P31) are connected as 4 bytes, but the 16-bit data bus is composed of either the lower or upper nibble of
each of the 4 bytes. For more detailed information, refer to Section 2.9.2. Since this mode uses 4 bit planes
for each pixel, they are fed into the low-order address bits of the palette, with the 4 high-order address bits
being defined by the palette page register (see Section 2.2.3).
2.4.5
Multiplex Control Register
The multiplexer is controlled via the 8-bit multiplex control register. The bit fields of the register are in Table 6.
2–8
Table 6. Mode and Bus Width Selection
MODE
0#
MUX CONTROL REGISTER BITS†
DATA BITS
PER
PIXEL‡
PIXEL BUS
WIDTH
SCLK
DIVIDE
RATIO§
PIXEL
LATCHING
SEQUENCE¶
5
4
3
2
1
0
1
0
1
1
0
1
8
8
1
1) VGA<7:0>
0
1
0
0
0
0
1
4
4
1)
2)
3)
4)
0
1
0
0
0
1
1
8
8
1) P<0>
2) P<1>
0
1
0
0
1
0
1
16
16
0
1
0
0
1
1
1
32
32
0
1
0
1
0
0
2
4
2
1) P<1:0>
2) P<3:2>
0
1
0
1
0
1
2
8
4
1)
2)
3)
4)
0
1
0
1
1
0
2
16
8
1) P<1:0>
2) P<3:2>
0
1
0
1
1
1
2
32
16
0
1
1
0
0
0
4
4
1
1) P<3:0>
0
1
1
0
0
1
4
8
2
1) P<3:0>
2) P<7:4>
0
1
1
0
1
0
4
16
4
1)
2)
3)
4)
0
1
1
0
1
1
4
32
8
1) P<3:0>
2) P<7:4>
P<0>
P<1>
P<2>
P<3>
...
8) P<7>
1
1) P<0>
2) P<1>
...
16) P<15>
1) P<0>
2) P<1>
...
32) P<31>
2
P<1:0>
P<3:2>
P<5:4>
P<7:6>
...
8) P<15:14>
1) P<1:0>
2) P<3:2>
...
16) P<31:30>
3
P<3:0>
P<7:4>
P<11:8>
P<15:12>
...
8) P<31:28>
2–9
MODE
MUX CONTROL REGISTER BITS†
DATA BITS
PER
PIXEL‡
PIXEL BUS
WIDTH
SCLK
DIVIDE
RATIO§
5
4
3
2
1
0
0
1
1
1
0
0
8
8
1
1) P<7:0>
0
1
1
1
0
1
8
16
2
1) P<7:0>
2) P<15:8>
0
1
1
1
1
0
8
32
4
1)
2)
3)
4)
0
0
1
1
0
1
24
32
1
1) P<31:8>
0
1
1
1
1
1
4
16
4
NFLAG = 0:
1) P<3:0>
2) P<11:8>
3) P<19:16>
4) P<27:24>
4
5||
6
PIXEL
LATCHING
SEQUENCE¶
P<7:0>
P<15:8>
P<23:16>
P<31:24>
NFLAG = 1:
1) P<7:4>
2) P<15:12>
3) P<23:20>
4) P<31:28>
† Bits 6 and 7 are don’t care bits.
‡ This is the number of bits of pixel port (or VGA port in mode 1) information used as color data for each displayed pixel,
often referred to as the number of bit planes. This may be color palette address data (Modes 0 – 4 and 6) or DAC data
(mode 5).
§ The SCLK divide ratio is the number used for the output clock selection register. It indicates the number of pixels per
bus load, or the number of pixels associated with each SCLK pulse. For example, with a 32-bit pixel bus width and 8
bit planes, 4 pixels comprise each bus load. The SCLK divide ratio is not automatically set by mode selection, but must
be written to the output clock selection register.
¶ For each operating mode, the pixel latching sequence indicates the sequence in which pixel port or VGA port data are
latched into the device. The latching sequence is initiated by a rising edge on SCLK. For modes in which multiple groups
of data are latched, the SCLK rising edge latches all the groups, and the pixel clock shifts them out starting with the
low-numbered group. For example, in mode 3 with a 16-bit pixel bus width, the rising edge of SCLK latches all the data
groups, and the pixel clock shifts them out in the order P<3:0>, P<7:4>, P<11:8>, P<15:12>.
# Mode 0 is VGA pass-through mode.
|| Mode 5 is true color mode, in which 24 bits of color information are transferred directly from the pixel port to the DACs;
overlay is implemented with the remaining 8 bits of the pixel bus. The distribution of pixel port data to the DACs is as
follows: P<31:24> are passed to the blue DAC, P<23:16> are passed to the green DAC, and P<15:8> are passed to
the red DAC. P<7:0> are used to generate overlay data; this operation can be disabled by either grounding P<7:0> or
by clearing the read mask (see Section 1.4.5).
Mode 6 is special nibble mode, the only mode in which the pixel bus width is not equal to the actual physical width, in
bits, of the pixel bus. In this mode, the pixel bus is physically 32 bits wide; depending on the value of SFLAG/NFLAG,
either the upper or lower nibble of each of the four physical bytes is selected to comprise the 16 bits of pixel data (equal
to four 4-bit pixels).
NOTE: Although leaving unused pins floating will not adversely affect device operation, tying unused pins to ground lowers
power consumption and, thus, is recommended.
2–10
As an example of how to use Table 6, suppose that the design goals specify a system with eight data bits
per pixel and the lowest possible SCLK rate. Table 6 shows that, for non-VGA-pass-through operation, only
mode 4 supports an eight-bit pixel depth. The lowest-possible SCLK rate within mode 4 is 1:4. This set of
conditions is selected by writing the value 1Eh to the mux control register. The pixel latching sequence
column shows that, in this mode, P<7:0> should be connected to the earliest-displayed pixel plane, followed
by P<15:8>, P<23:16>, and then P<31:24> as the last displayed pixel plane. Assuming that VCLK is
programmed as DOTCLK/4, Table 2– 5 shows that the 1:4 SCLK ratio is selected by writing the value 12h
to the output clock selection register. The special nibble mode should also be disabled (see Sections 2.9.2
and 2.11.2).
When the mux control register is loaded with 2Dh, the TLC34075 enters the VGA pass-through mode (the
same condition as the default power-up mode). Please refer to Section 2.5.4 for more details.
2.4.6
Read Masking
The read mask register is used to enable or disable a pixel address bit from addressing the color palette
RAM. Each palette address bit is logically ANDed with the corresponding bit from the read mask register
before addressing the palette. This function is performed after the addition of the page register bits and,
therefore, a zeroing of the read mask results in one unique palette location (location 0) and is not affected
by the palette page register contents.
2.5
Reset
There are 3 ways to reset the TLC34075:
1.
2.
3.
2.5.1
Power-on reset
Hardware reset
Software reset
Power-On Reset
The TLC34075 contains a power-on reset circuit. Once the voltage levels have stabilized following power-on
reset, the device is in the VGA pass-through mode.
2.5.2
Hardware Reset
The TLC34075 resets whenever RS<3:0> = HHHH and a rising edge occurs on the WR input. The more
rising WR edges occur, the more reliable the TLC34075 is reset. This scheme (bursting WR strobes until
the power supply voltage stablizes) is suggested at power-up if a hardware reset approach is used.
The default reset condition is VGA pass-through mode, and the values for each register are shown in
Section 2.5.4.
2.5.3
Software Reset
Whenever the mux control register is set for VGA pass-through mode after power-up, all registers are
initialized accordingly. Since VGA pass-through mode is the default condition at power-up and hardware
reset, the act of selecting the VGA pass-through mode through programming the mux control register is
viewed as a software reset. Therefore, whenever mux control register bits <5:0> are set to 2Dh, the
TLC34075 initiates a software reset.
2.5.4
VGA Pass-Through Mode Default Conditions
The value contained in each register after hardware or software reset is shown below:
Mux control register:
Input clock selection register:
Output clock selection register:
Palette page register:
General control register:
2Dh
00h
3Fh
00h
03h
2–11
Pixel read mask register:
Palette address register:
Palette holding register:
Test register:
2.6
FFh
xxh
xxh
(Pointing to color palette red value)
Frame Buffer Interface
The TLC34075 provides two clock signals for controlling the frame buffer interface: SCLK and VCLK. SCLK
can be used to clock out data directly from the VRAM shift registers. Split shift register transfer functionality
is also supported. VCLK is used to clock and synchronize control inputs like HSYNC, VSYNC, and BLANK.
The pixel data presented at the inputs is latched at the rising edge of SCLK in normal mode or the rising edge
of CLK0 in VGA pass-through mode. Control inputs HSYNC, VSYNC, and BLANK are sampled and latched
at the falling edge of VCLK in normal mode, while HSYNC, VSYNC, and VGABLANK are latched at the rising
edge of CLK0 in VGA pass-through mode. Both data and control signals are lined up at the DAC outputs
to the monitors through the internal pipeline delay, so external glue logic is not required. The outputs of the
DACs are capable of directly driving a 37.5-Ω load, as in the case of a doubly terminated 75-Ω cable. See
Figures 9 and 10 for nominal output levels.
2.7
Analog Output Specifications
The DAC outputs are controlled by current sources (three for IOG and two each for IOR and IOB) as shown
in Figure 8. In the normal case, there is a 7.5-IRE difference between blank and black levels, which is shown
in Figure 9. If a 0-IRE pedestal is desired, it can be selected by resetting bit 4 of the general control register
(see Section 2.11.3). The video output for a 0-IRE pedestal is shown in Figure 10.
VAA
IOG
∼ 15 pF
SYNC
(IOG Only)
BLANK
RL
G <0:7>
Figure 8. Equivalent Circuit of the IOG Current Output
2–12
White
Green
[mA]
[V]
Red/Blue
[mA]
[V]
26.67
1.000
19.05 0.714
9.05
0.340
1.44
0.054
7.62
0.286
0.00
0.000
0.00
0.000
92.5 IRE
Black
7.5 IRE
Blank
40 IRE
Sync
Figure 9. 7.5-IRE, 8-Bit Composite Video Output
White
Green
[mA]
[V]
Red/Blue
[mA]
[V]
25.24
0.95
17.62
0.66
7.62
0.286
0.00
0.000
0.00
0.000
100 IRE
Black/
Blank
Sync
43 IRE
Figure 10. 0-IRE, 8-Bit Composite Video Output
NOTE: 75-Ω doubly terminated load. VREF = 1.235 V, RSET = 523 Ω. RS-343A levels and tolerances are assumed.
A resistor (RSET) is needed to connect the FS ADJ pin to GND to control the magnitude of the full-scale video
signal. The IRE relationships in Figures 9 and 10 are maintained regardless of the full-scale output current.
2–13
The relationship between RSET and the full-scale output current IOG is:
RSET (Ω) = K1 × VREF (V) / IOG (mA)
The full-scale output current on IOR and IOB for a given RSET is:
IOR, IOB (mA) = K2 × VREF (V) / RSET (Ω)
where K1 and K2 are defined as:
IOG
PEDESTAL
2.8
IOR, IOB
8-BIT OUTPUT
6-BIT OUTPUT
8-BIT OUTPUT
6-BIT OUTPUT
7.5-IRE
K1 = 11,294
K1 = 11,206
K2 = 8,067
K2 = 7,979
0-IRE
K1 = 10,684
K1 = 10,600
K2 = 7,462
K2 = 7,374
HSYNC, VSYNC, and BLANK
For the normal modes, HSYNC and VSYNC are active-low pulses, and they are passed through
true/complement gates to the HSYNCOUT and VSYNCOUT outputs. The output polarities of HSYNCOUT
and VSYNCOUT can be programmed through the general control register. However, for the VGA
pass-through mode, the polarities needed for monitors are already provided at the feature connector from
which HSYNC and VSYNC are sourced, so the TLC34075 just passes HSYNC and VSYNC through to
HSYNCOUT and VSYNCOUT without polarity change. As described in Section 2.3 and Figures 4 through
5, the BLANK, HSYNC, and VSYNC inputs are sampled and latched on the falling edge of VCLK in the
normal modes, and they are latched on the rising edge of the CLK0 input in the VGA pass-through mode.
Refer to Figure 16 for the detailed timing.
The HSYNC and VSYNC inputs are used for both the VGA pass-through and normal modes. If the
application uses both VGA pass-through and normal modes, an external multiplexer is needed to select
HSYNC and VSYNC between VGA pass-through mode and normal mode. The MUXOUT signal is designed
for this purpose (see Sections 2.10 and 2.11).
The HSYNC, VSYNC, and BLANK signals have internal pipeline delays to align the data at the outputs. Due
to the sample and latch timing delay, it is possible to have active SCLK pulses after the BLANK input
becomes active. The relationship between VCLK and SCLK and the internal VCLK sample and latch delay
need to be carefully reviewed and programmed. See Section 2.3 and Figures 4 and 5 for more details.
As shown in Figure 18 for the IOG DAC output, active HSYNC and VSYNC signals turn off the sync current
source (after the pipeline delay) independent of the BLANK signal level. In real applications, HSYNC and
VSYNC should only be active (low) when BLANK is active (low).
To alter the polarity of the HSYNCOUT and VSYNCOUT outputs in the normal modes, the MPU must set
or clear the corresponding bits in the general control register (see Section 2.11.1). Again, these two bits
affect only the normal modes, not the VGA pass-through mode. These bits default to 1.
2.9
Split Shift Register Transfer VRAMs and Special Nibble Mode
2.9.1
Split Shift Register Transfer VRAMs
The TLC34075 directly supports split shift register transfer (SSRT) VRAMs. In order to allow the VRAMs
to perform a split shift register transfer, an extra SCLK cycle must be inserted during the blank sequence.
This is initiated when the SSRT enable bit (bit 2 in the general control register) is set to 1, the SNM bit (bit 3
in the general control register) is reset to 0 (see Section 2.11), and a rising edge on the SFLAG/NFLAG input
pin is detected. An SCLK pulse is generated within 20 ns of the rising edge of the SFLAG/NFLAG signal.
A minimum 15-ns high logic level duration is provided to satisfy all of the – 15 VRAM requirements. By
controlling the SFLAG/NFLAG rise time, the delay time from the rising edge of the VRAM TRG signal to
SCLK can be satisfied. The relationship between the SCLK, SFLAG/NFLAG, and BLANK signals is as
follows:
2–14
BLANK
SSRT Enable
(General Control
Register Bit 2)
SFLAG/NFLAG
Input
SCLK
Figure 11. Relationship Between SFLAG/NFLAG, BLANK, and SCLK
If SFLAG/NFLAG is designed as an R-S latch set by split shift register transfer timing and reset by BLANK
going high, the delay from BLANK high to SFLAG/NFLAG low cannot exceed one-half of one SCLK cycle;
otherwise, the SCLK generation logic may fail.
If the SSRT function is enabled but SFLAG/NFLAG is held low, SCLK runs as if the SSRT function is
disabled. The SFLAG/NFLAG input is not qualified by the BLANK signal and needs to be held low whenever
an SSRT SCLK pulse is not desired. Refer to Section 2.3.1 and Figures 4 through 10 for more system details.
2.9.2
Special Nibble Mode
Special nibble mode is enabled when the SNM bit (bit 3 in the general control register) is set to 1 and the
SSRT bit (bit 2 in the general control register) is reset to 0 (see Section 2.11). Special nibble mode provides
a variation of the 4-bit pixel mode with a 16-bit bus width. While all 32 inputs (P<0:31>) are connected as
4 bytes, the 16-bit data bus is composed of the lower or upper nibble of each of the 4 bytes, depending on
the level of the SFLAG/NFLAG input. The pixel data is distributed to 16-bit data bus as shown in Table 7.
Table 7. Pixel Data Distribution in Special Nibble Mode
SNM BIT = 1, SSRT BIT = 0
SFLAG/NFLAG = 1
P<7:4>
P<15:12>
P<23:20>
P<31:28>
SFLAG/NFLAG = 0
P<3:0>
P<11:8>
P<19:16>
P<27:24>
The SFLAG/NFLAG value is not latched by the TLC34075. Therefore, it should stay at the same level during
the whole active display period, changing levels only during the BLANK signal active time. Refer to
Figure 12, which is similar to Figure 4 except that the BLANK signal timing reference to SFLAG/NFLAG is
explained. The SFLAG/NFLAG input has to meet the setup time and hold the data long enough to ensure
that no pixel data is missed.
Special nibble mode operates at the line frequency when BLANK is active. However, the typical application
of this mode is double frame buffers with pixel data width of 4 bits. While one frame buffer is being displayed
on the monitor, the other frame buffer can be used to accept new picture information. SFLAG/NFLAG is used
to indicate which frame buffer is being displayed.
SNM and SSRT must be mutually exclusive. Unpredictable operation occurs if both the SNM and SSRT bits
are set to 1. The mux control register should be set up as shown in Table 6 (see Section 2.4.5). However,
the SNM bit takes precedence over the other mux control register selections. In other words, if the mux
control register is set up for another mode but special nibble mode is still enabled in the general control
register, the input multiplex circuit takes whatever SCLK divide ratio the mux control register specifies and
performs the nibble operation, causing operational failure.
2–15
During special nibble mode, the input mux circuit latches all 8-bit inputs but only passes on the specified
nibble. The specified nibble is stored in the 4 LSBs of the next register pipe after the input latch, and the
4 MSBs are zeroed in that register. The register pipe contents are then passed to the read mask block. With
this structure, the palette page register still functions normally, providing good flexibility to users.
If the general control register bit 3 = 0 and bit 2 = 0, both split shift register transfers and special nibble mode
are disabled and the SFLAG/NFLAG input is ignored.
VCLK
BLANK
(at its input pin)
SFLAG/NFLAG
Input
†
‡
Valid
Don’t Care
Latch Last Group
of Pixel Data
Valid
Latch First Group
of Pixel Data
LOAD
Sampled
BLANK
2nd
4th
1st Group 3rd Group 5th
Group
Group
Group
Last Group of Pixel Data
PIXEL DATA
SCLK
† CAUTION:
If the data is not held valid until SCLK and BLANK both go low, the last few pixels could be missed.
‡ Setup time to next VCLK falling edge after BLANK high (must be met, otherwise the first pixel data
could be missed).
Figure 12. SFLAG/NFLAG Timing in Special Nibble Mode
2.10
MUXOUT Output
MUXOUT is a TTL-compatible output. It is software programmable and is used to control external devices.
Its typical application is to select the HSYNC and VSYNC inputs between the VGA pass-through mode and
the normal modes (see Section 2.8). This output is driven low at power-up or when VGA pass-through mode
is selected; at any other time it can be programmed to the desired polarity via general control register bit
7.
2.11
General Control Register
The general control register is used to control HSYNC and VSYNC polarity, split shift register transfer
enabling, special nibble mode, sync control, the ones accumulation clock source, and the VGA
pass-through indicator. The bit field definitions are as follows:
2–16
Table 8. General Control Register Bit Functions
GENERAL CONTROL REGISTER BIT
2.11.1
FUNCTION
7
6
5
4
3
2
1
0
X
X
X
X
X
X
X
0
HSYNCOUT is active-low
X
X
X
X
X
X
X
1
HSYNCOUT is active-high (default)
X
X
X
X
X
X
0
X
VSYNCOUT is active-low
X
X
X
X
X
X
1
X
VSYNCOUT is active-high (default)
X
X
X
X
X
0
X
X
Disable split shift register transfer (default)
X
X
X
X
0
1
X
X
Enable split shift register transfer
X
X
X
X
0
X
X
X
Disable special nibble mode (default)
X
X
X
X
1
0
X
X
Enable special nibble mode
X
X
X
0
X
X
X
X
0-IRE pedestal (default)
X
X
X
1
X
X
X
X
7.5-IRE pedestal
X
X
0
X
X
X
X
X
Disable sync (default)
X
X
1
X
X
X
X
X
Enable sync
X
0
X
X
X
X
X
X
Reserved (default)
X
1
X
X
X
X
X
X
Reserved
0
X
X
X
X
X
X
X
MUXOUT is low (default)
1
X
X
X
X
X
X
X
MUXOUT is high
HSYNCOUT and VSYNCOUT (Bits 0 and 1)
HSYNCOUT and VSYNCOUT polarity inversion is provided to allow indication to monitors of the current
screen resolution. Since the polarities for VGA pass-through mode are provided at the feature connector,
the inputs to the TLC34075 will have the right polarities for monitors already, so the TLC34075 just passes
them through with pipeline delay (see Section 2.8). These two bits only work in the normal modes, and the
input horizontal and vertical syncs are assumed to be active-low incoming pulses. These two bits default
to the value 1 but can be changed by software.
2.11.2
Split Shift Register Transfer Enable (SSRT) and Special Nibble Mode Enable
(SNM) (Bits 2 and 3)
See Section 2.9.
2.11.3
Pedestal Enable Control (Bit 4)
This bit specifies whether a 0- or 7.5-IRE blanking pedestal is to be generated on the video outputs. Having
a 0-IRE blanking pedestal means that the black and blank levels are the same.
0: 0-IRE pedestal (default)
1: 7.5-IRE pedestal
2.11.4
Sync Enable Control (Bit 5)
This bit specifies whether or not SYNC information is to be output onto IOG.
0: Disable sync (default)
1: Enable sync
2.11.5
MUXOUT (Bit 7)
The MUXOUT bit indicates to external circuitry that the device is running in VGA pass-through mode. This
bit does not affect the operation of the device (see Section 2.10).
0: MUXOUT is low (default in VGA pass-through mode)
1: MUXOUT is high
2–17
2.12
Test Register
There are three test functions provided in the TLC34075, and they are all controlled and monitored through
the test register. They are data flow check, DAC analog test, and screen integrity test.
The test register has two ports: one for a control word, accessed by writing to the register location, and one
for the data word, accessed by reading from the register location. Depending on the channel written in the
control word, the data read presents the information for that channel.
The control word is three bits long and occupies D<2:0>. It specifies which of the eight channels to inspect.
The following table and state machine diagrams show how each channel is addressed:
Table 9. Test Mode Selection
D2
D1
D0
0
0
0
Color palette red value
CHANNEL
0
0
1
Color palette green value
0
1
0
Color palette blue value
0
1
1
Identification code
1
0
0
Ones accumulation red value
1
0
1
Ones accumulation green value
1
1
0
Ones accumulation blue value
1
1
1
Analog test
ID code
011
RD
000
RESET
RD
010
Blue
Red
RD
RD
001
Green
Data Flow Check
Red
100
Blue
RD
110
RD
111
RD
DAC Analog Test
RD
101
Green
Screen Integrity Test
Figure 13. Test Register Control Word State Diagrams
2–18
2.12.1
Frame Buffer Data Flow Test
The TLC34075 provides a means to check all the data entering the DAC (but before the output multiplexer
8/6 shift). When accessing these color channels, the data entering the DACs should be kept constant for
the entire MPU read cycle. This can be done either by slowing down the dot clock or ensuring that the data
is constant for a sufficiently long series of pixels. The value read is the one stored in the color palette RAM
location pointed to by the input multiplexer. The read operation causes a post-increment to point to the next
color channel, and the post-increment of blue wraps back to red as shown in the preceeding state diagram.
For example, if D<2:0> is written as 001, then three succsessive reads are performed, the values read out
are green, blue, and red in that sequence.
2.12.2
Identification Code
The ID code can be used for identification of different software versions. The ID code in the TLC34075 is
static and may be read without consideration of the dot clock or video signals. To be user-friendly, the read
postincrement also applies to the ID register, but once it falls into the color channel, it will not come back
pointing to the ID unless the value 011 is written to D<2:0> again. So, if the test register is written as 011
in D<2:0>, then six successive reads are performed, the first value read is the ID and the last value read
is green. The ID value defined here is 75h.
2.12.3
Ones Accumulation Screen Integrity Test
A technique called ones accumulation can be used to detect errors in fixed (not animated) screen displays.
This type of error detection is useful for system checkout and field diagnostics.
Each of the 256 24-bit words in the TLC34075 internal color palette RAM is composed of three bytes, one
each for the red, green, and blue components of the word. When D<2:0> are programmed with the
appropriate binary value (see Table 9), the TLC34075 monitors the corresponding color byte that is output
by the color palette RAM. For example, if D<2:0> are programmed with the value 100, the TLC34075
monitors the red byte. As the current frame is scanned, for each color palette RAM word accessed, the
designated color byte is checked to see how many “1” bits it contains, and this number is added to a
temporary accumulator (the entire byte is checked, even if 6-bit mode is selected). For example, if the
designated color byte contains the value 41h (0100 0001), then the value 2 is added to the temporary
accumulator, as 41h contains two “1” bits. This process is continued until an entire frame has been scanned;
the same color byte is monitored for the entire frame. The temporary accumulator truncates any overflow
above the value 255. Due to circuit speed limitations, the ones accumulation is calculated at a speed of
(DOTCLK frequency)/2. During the vertical retrace activated by a falling edge on the TLC34075 VSYNC
input, the value in the temporary accumulator is transferred into the ones accumulation register, and then
the temporary accumulator is reset to zero (NOTE: the ones accumulation register is updated only on the
falling edge of VSYNC, not by any vertical sync pulses coded into the composite video signal). Before the
next frame scan begins, the TLC34075 automatically changes the value in D<2:0> so that the ones
accumulation performed during the next frame scan is for a different color byte (see the screen integrity test
state diagram of Figure 13). As long as the screen display remains fixed, the ones accumulation value for
a particular color byte should not change; if it does, an error has occurred.
2.12.4
Analog Test
Analog test is used to compare the voltage amplitudes of the analog RGB outputs to each other and to a
145-mV reference. This enables the MPU to determine whether the CRT monitor is connected to the analog
RGB outputs or not and whether the DACs are functional. To perform an analog test, D<2:0> must be set
to 111; D<7:4> are set as shown in Table 11. D<3> contains the result of the analog test.
2–19
Table 10. Test Register Bit Definitions for Analog Test
BIT DEFINITION
READ/WRITE
D7: Red select
R/W
D6: Green select
R/W
D5: Blue select
R/W
D4: 145-mV reference select
R/W
D3: Result
R
Table 11. D<7:4> Bit Coding for Analog Comparisons
D<7:4>
OPERATION
IF D3 = 1
IF D3 = 0
0000
Normal operation
Don’t care
Don’t care
1010
Red DAC compared to blue DAC
Red > blue
Red < blue
1001
Red DAC compared to 145-mV reference
Red > 145 mV
Red < 145 mV
0110
Green DAC compared to blue DAC
Green > blue
Green < blue
0101
Green DAC compared to 145-mV reference
Green > 145 mV
Green < 145 mV
NOTE: All the outputs have to be terminated to compare the voltage.
IOR or IOG
+
IOB or 145 mV
–
D
BLANK
(Internal Signal)
Q
D3
C
Figure 14. Internal Comparator Circuitry for Analog Test
The result of the analog comparison is strobed into D3 at the falling edge of an internal signal derived from
the input BLANK signal. In order to have stable inputs to the comparator, the DAC should be set to a constant
level between syncs. For normal operation, data flow check, and screen integrity test, D<7:4> must be set
to zero.
2–20
3
Specifications
3.1 Absolute Maximum Ratings Over Operating Free-Air Temperature Range
(Unless Otherwise Noted)†
Supply voltage, VDD (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage range, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VDD + 0.5 V
Analog output short-circuit duration to any power supply or common . . . . . . . . . unlimited
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175°C
Case temperature for 10 seconds: FN package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . 260°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These
are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated
under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for
extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to the GND terminal.
3.2 Recommended Operating Conditions
VDD
VREF
Supply voltage
Reference voltage
VIH
High-level input voltage
VIL
Low-level input voltage
MIN
NOM
MAX
UNIT
4.75
5
5.25
V
1.2
1.235
1.26
V
VDD + 0.5
VDD + 0.5
V
TTL inputs
2.4
ECL inputs
VDD – 1
TTL inputs
ECL inputs
0.8
–0.5
VDD – 1.6
Output load resistance, RL
37.5
FS ADJUST resistor, RSET
523
Operating free-air temperature
0
V
Ω
Ω
70
°C
3–1
3.3 Electrical Characteristics
PARAMETER
VOH
High-level output voltage
VOL
Low-level output
voltage
D<0:7>, MUXOUT, VCLK
HSYNCOUT, VSYNCOUT
SCLK
IIH
IIL
IDD
High-level input
TTL inputs
current
ECL inputs
Low-level input
TTL inputs
current
ECL inputs
MIN TYP†
MAX
2.4
0.4
IOL = 15 mA
IOL = 18 mA
0.4
VI = 2.4 V
VI = 4 V
1
VI = 0.8 V
VI = 0.4 V
–1
1
–1
Supply current,
TLC34075-85
375
pseudo-color mode
TLC34075-110
400
470
See Note 2
450
Supply current,
TLC34075-85
450
true color mode
TLC34075-110
450
TLC34075-135
450
IOZ
High-impedance-state output currrent
Ci
Input capacitance
V
0.4
350
TLC34075-66
UNIT
V
TLC34075-66
TLC34075-135
IDD
TEST CONDITIONS
IOH = –800 µA
IOL = 3.2 mA
10
TTL inputs
f = 1 MHz, VI = 2.4 V
4
ECL inputs
f = 1 MHz, VI = 4 V
4
µA
µA
mA
µA
pF
† All typical values are at VDD = 5 V, TA = 25°C.
NOTE 2: IDD is measured with DOTCLK running at the maximum specified frequency, SCLK frequency =
DOTCLK frequency/4, and the palette RAM loaded with full-range toggling patterns (00h/00h/FFh/FFh/00h/
00h/FFh/FFh/ . . .). Pseudo-color mode is also known as color indexing mode.
3–2
3.4 Operating Characteristics
PARAMETER
Resolution (each DAC)
EL
ED
TEST CONDITIONS
MIN
TYP
8/6 high
8
8/6 low
6
End-point linearity error
8/6 high
(each DAC)
8/6 low
Differential linearity error
8/6 high
(each DAC)
8/6 low
1/4
1
1/4
5%
19.05
20.4
White level relative to black (7.5 IRE only)
16.74
17.62
18.5
Black level relative to blank (7.5 IRE only)
0.95
1.44
1.9
0
5
50
µA
Blank level on IOG (with SYNC enabled)
6.29
7.6
8.96
mA
Sync level on IOG (with SYNC enabled)
0
5
50
µA
One LSB (8/6 high)
69.1
One LSB (8/6 low)
276.4
2%
DAC-to-DAC crosstalk
–20
Output compliance
–1
Output impedance
f = 1 MHz, IOUT = 0
Glitch impulse (see Note 2)
Normal mode
VGA pass-through mode
mA
µA
5%
dB
1.2
50
Clock and data feedthrough
Pipeline delay
LSB
17.69
DAC-to-DAC matching
Output capacitance
LSB
White level relative to blank
Blank level on IOR, IOB
Voc
UNIT
bits
1
Gray scale error
Output current
MAX
V
kΩ
13
pF
–20
dB
50
pV-s
1 SCLK + 9 DOTCLK
7.5 DOTCLK
periods
NOTE 2: Glitch impulse does not include clock and data feedthrough. The – 3-dB test bandwidth is twice the clock rate.
3–3
3.5 Timing Requirements
TLC34075-66
PARAMETER
MIN
MAX
TLC34075-85
MIN
MAX
TLC34075-110
MIN
MAX
TLC34075-135
MIN
MAX
UNIT
DOTCLK frequency
66
85
110
135
MHz
CLK0 frequency for VGA
pass-through mode
66
85
85
85
MHz
TTL
15.2
11.8
9.1
7.4
ECL
15.2
11.8
9.1
7.4
Setup time, RS<0:3>
valid before RD or WR ↓
10
10
10
10
ns
th1
Hold time, RS<0:3> valid
after RD or WR ↓
10
10
10
10
ns
tsu2
Setup time, D<0:7> valid
before WR ↑
35
35
35
35
ns
th2
Hold time, D<0:7> valid
after WR ↑
0
0
0
0
ns
tsu3
Setup time, VGA<0:7> and
HSYNC, VSYNC, and
VGABLANK valid before
CLK0 ↑
2
2
2
2
ns
th3
Hold time, VGA<0:7> and
HSYNC, VSYNC, and
VGABLANK valid after CLK0 ↑
2
2
2
2
ns
tsu4
Setup time, P<0:31> valid
before SCLK ↑
2
2
2
0
ns
th4
Hold time, P<0:31> valid after
SCLK ↑
5
5
5
5
ns
tsu5
Setup time, HSYNC, VSYNC,
and BLANK valid before
VCLK ↓
5
5
5
5
ns
th5
Hold time, HSYNC, VSYNC,
and BLANK valid after VCLK ↓
2
2
2
2
ns
Pulse duration, RD or WR low
50
50
50
50
ns
Pulse duration, RD or WR high
30
30
30
30
ns
TTL
4.5
4
3.5
3
ECL
5.5
4
3.5
3
TTL
tcyc
Clock cycle time
tsu1
tw1
tw2
tw3
Pulse duration, clock high
tw4
Pulse duration, clock low
4.5
4
3.5
3
ECL
5.5
4
3.5
3
tw5
Pulse duration, SFLAG/NFLAG
high (see Note 4)
30
30
30
30
ns
ns
ns
ns
NOTES: 3. TTL input signals are 0 to 3 V with less than 3 ns rise/fall time between the 10% and 90% levels unless
otherwise specified. ECL input signals are VDD –1.8 V to VDD – 0.8 V with less than 2 ns rise/fall time between
the 20% and 80% levels. For input and output signals, timing reference points are at the 10% and 90% signal
levels. Analog output loads are less than 10 pF. D<0:7> output loads are less than 50 pF. All other output loads
are less than 50 pF unless otherwise specified.
4. This parameter applies when the split shift register transfer (SSRT) function is enabled. See Section 2.9.1
for details.
3–4
3.6 Switching Characteristics
TL34075-66, TLC34075-85
TLC34075- 66
PARAMETER
MIN
TYP
TLC34075-85
MAX
MIN
TYP
MAX
UNIT
SCLK frequency (see Note 5)
66
85
MHz
VCLK frequency
66
85
MHz
ten1
tdis1
Enable time, RD low to D<0:7> valid
40
40
ns
Disable time, RD high to D<0:7> disabled
17
17
ns
tv1
Valid time, D<0:7> valid after RD high
5
tPLH1
Propagation delay, SFLAG/NFLAG ↑ to SCLK
high (see Note 6)
0
td1
Delay time, RD low to D<0:7> starting to turn
on
5
td2
Delay time, selected input clock high/low to
DOTCLK (internal signal) high/low
7
7
ns
td3
Delay time, DOTCLK high/low to VCLK
high/low
6
6
ns
td4
Delay time, VCLK high/low to SCLK high/low
td5
Delay time, DOTCLK high/low to SCLK
high/low
td6
Delay time, DOTCLK high to IOR/IOG/IOB
active (analog output delay time) (see Note 7)
td7
Analog output settling
time (see Note 8)
td8
Delay time, DOTCLK high to HSYNCOUT and
VSYNCOUT valid
tw6
tr
Pulse duration, SCLK high (see Note 6)
20
ns
0
20
5
0
5
0
5
ns
8
8
ns
20
20
ns
8
5
15
5
55
15
2
0
ns
ns
8
Analog output rise time (see Note 9)
Analog output skew
5
ns
55
2
2
0
ns
ns
ns
2
ns
NOTES: 5. SCLK can drive an output capacitive load up to 60 pF. The worst-case transition time between the 10% and
90% levels is less than 4 ns.
6. This parameter applies when the split shift register transfer (SSRT) function is enabled. See Section 2.9.1
for details.
7. Measured from the 90% point of the rising edge of DOTCLK to 50% of the full-scale transition.
8. Measured from the 50% point of the full-scale transition to the point at which the output has settled, within
± 1 LSB (settling time does not include clock and data feedthrough).
9. Measured between 10% and 90% of the full-scale transition.
3–5
3.6 Switching Characteristics (Cont’d.)
TL34075-110, TLC34075-135
TLC34075-110
PARAMETER
MIN
TYP
TLC34075-135
MAX
MIN
TYP
MAX
UNIT
SCLK frequency (see Note 10)
85
85
MHz
VCLK frequency
85
85
MHz
ten1
tdis1
Enable time, RD low to D<0:7> valid
40
40
ns
Disable time, RD high to D<0:7> disabled
17
17
ns
tv1
Valid time, D<0:7> valid after RD high
5
tPLH1
Propagation delay, SFLAG/NFLAG ↑ to SCLK
high (see Note 11)
0
td1
Delay time, RD low to D<0:7> starting to turn
on
5
td2
Delay time, selected input clock high/low to
DOTCLK (internal signal) high/low
7
7
ns
td3
Delay time, DOTCLK high/low to VCLK
high/low
6
6
ns
td4
Delay time, VCLK high/low to SCLK high/low
td5
Delay time, DOTCLK high/low to SCLK
high/low
td6
Delay time, DOTCLK high to IOR/IOG/IOB
active (analog output delay time) (see Note
12)
td7
Analog output settling time (see Note 13)
td8
Delay time, DOTCLK high to HSYNCOUT and
VSYNCOUT valid
tw6
tr
Pulse duration, SCLK high (see Note 11)
20
ns
0
20
5
0
5
0
5
ns
8
8
ns
20
20
ns
6
3
15
3
55
15
2
0
ns
ns
6
Analog output rise time (see Note 14)
Analog output skew
5
ns
55
2
2
0
ns
ns
ns
2
ns
NOTES: 10. SCLK can drive an output capacitive load up to 60 pF. The worst-case transition time between the 10% and
90% levels is less than 4 ns.
11. This parameter applies when the split shift register transfer (SSRT) function is enabled. See Section 2.9.1
for details.
12. Measured from the 90% point of the rising edge of DOTCLK to 50% of the full-scale transition.
13. Measured from the 50% point of the full-scale transition to the point at which the output has settled, within
± 1 LSB (settling time does not include clock and data feedthrough).
14. Measured between 10% and 90% of the full-scale transition.
3–6
3.7 Timing Diagrams
tsu1
RS <0:3>
th1
Valid
tw1
tw2
RD,WR
tdis1
ten1
D <0:7>
(Output)
Data Out, RD Low
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
td1
D <0:7>
(Input)
tsu2
ÎÎÎÎÎ
ÎÎÎÎÎ
tv1
Data In,
WR Low
th2
Figure 15. MPU Interface Timing
3–7
tcyc
tw3
tw4
CLK <0:3>
td2
td2
DOTCLK
(Internal Signal)
td3
td3
VCLK
td4
td5
td4
td5
SCLK
th3
tsu3
VGA <0:7>,
HSYNC, VSYNC, VGABLANK
(VGA Pass-Through Mode)
Data
th4
tsu4
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
Data
P <0:31>
th5
tsu5
HSYNC, VSYNC, BLANK
(Normal Mode)
Data
td6
td7
IOR,IOG,IOB
td8
HSYNCOUT
VSYNCOUT
Valid
tr
Valid
Figure 16. Video Input/Output
BLANK
tw5
SFLAG/
NFLAG
tPLH1
tw6
SCLK
Figure 17. SFLAG/NFLAG Timing (When SSRT Function is Enabled)
3–8
3–9
Appendix A
SCLK/VCLK and the TMS340x0
While the TLC34075 SCLK and VCLK outputs are designed for compatibility with all graphics systems, they
are also tightly coupled with the TMS340x0 Graphics System Processors. All the timing requirements of the
TMS340x0 have been considered. However, there are a few points that need to be explained with regard
to applications.
VCLK
All the video control signals in the TMS340x0 (i.e., BLANK, HSYNC, and VSYNC) are triggered and
generated from the falling edge of VCLK. The fact that the TLC34075 uses the falling edge to sample and
latch the BLANK input gives users maximum freedom to choose the frequency of VCLK and interconnect
the TLC34075 with the TMS340x0 GSP without glue logic. Needless to say, the VCLK frequency needs to
be selected to be compatible with the minimum VCLK period required by the TMS340x0.
In the TMS340x0, the same VCLK falling edge that generates BLANK requests a screen refresh. If the VCLK
period is longer than 16 TQs (TQ is the period of the TMS340x0 CLKIN), it is possible that the last SCLK
pulse could be used falsely to transfer the VRAM data from memory to the shift register along with the last
pixel transfer. The first SCLK pulse for the next scan line would then shift the first pixel data out of the pipe
and the screen would then falsely start from the second pixel.
SCLK and SFLAG
The TLC34075 SCLK signal is compatible with current -10 and slower VRAMs. When split shift register
transfers are used, one SCLK pulse has to be generated between the regular shift register transfer and the
split shift register transfer to ensure correct operation. The SFLAG input is designed for this purpose. SFLAG
can be generated from a programmable logic array and triggered by the rising edge of the TR/QE signal or
the rising edge of the RAS signal of the regular shift register transfer cycle. TR/QE can be used if the
minimum delay from when the VRAM’s TRG signal goes high to SCLK going high can be met by the
programmable logic array delay; otherwise, RAS can be used.
A–1
A–2
Appendix B
PC Board Layout Considerations
PC Board Considerations
A four-layer PC board should be used with the TLC34075: one layer each for 5-V power and GND and two
layers for signals. The layout should be optimized for the lowest-possible noise on the TLC34075 power and
ground lines by shielding the digital inputs and providing good decoupling. The lead length between groups
of VDD and GND pins should be minimized so as to reduce inductive ringing. The terminal assignments for
the TLC34075 P<0:31> inputs were selected for minimum interconnect lengths between these inputs and
the VRAM pixel data outputs. The TLC34075 should be located as close to the output connectors as
possible to minimize noise pickup and reflections due to impedance mismatching.
Ground Plane
A single ground plane is recommended for both the TLC34075 and the rest of the logic. Separate digital and
analog ground planes are not needed.
Power Plane
Split power planes are recommended for the TLC34075 and the rest of the logic. The TLC34075 and its
associated analog circuitry should have their own power plane (referred to as AVCC in Figure 18). The two
power planes should be connected at a single point through a ferrite bead as shown in Figures 18, 19, and
20. This bead should be located within three inches of the TLC34075.
Supply Decoupling
Bypass capacitors should be installed using the shortest leads possible, consistent with reliable operation,
to reduce the lead inductance.
For the best performance, a 0.1-µF ceramic capacitor in parallel with a 0.01-µF chip capacitor should be
used to decouple each of the three groups of power pins to GND. These capacitors should be placed as
close as possible to the device as shown in Figure 19.
If a switching power supply is used, the designer should pay close attention to reducing power supply noise
and should consider using a three-terminal voltage regulator for supplying power to AVCC.
COMP and VREF Terminals
A 100-Ω resistor and 0.1-µF ceramic capacitor (approximate values) should be connected in series
between the device’s COMP and VDD terminals in order to avoid noise and color-smearing problems. Also,
whether an internal or external voltage reference is used, a 0.1-µF capacitor should be connected between
the device’s VREF and GND terminals to further stabilize the video image. These resistor and capacitor
values may vary depending on the board layout; experimentation may be required in order to determine
optimum values.
B–1
R6
COMP
C9
L1
AVCC
VDD
VCC
R1
C1-C3
C5-C7
C11
VREF
C12
TLC34075
C10
D1
GND
GND
R2
R3
R4
R5
FS ADJUST
IOR
To Video Connector
IOG
IOB
LOCATION
DESCRIPTION
C1-C3, C9-C10, C12
0.1-µF ceramic capacitor
C5-C7
0.01-µF ceramic chip capacitor
C11
33-µF tantalum capacitor
L1
ferrite bead
R1
1000-Ω 1% metal-film resistor
R2
523-Ω 1% metal-film resistor
R3, R4, R5
75-Ω 1% metal-film resistor
R6
100-Ω 5% resistor
D1
1.2-V voltage reference
Figure 18. Typical Connection Diagram and Components (Shaded Area is Optional)
B–2
R1
C7
D1
C3
R6
P1
DB15 or
DB9 Connecator
C2
C6
U1
+
R3
R4
TLC34075
(84-Pin PLCC)
C5
L1
C9
C12
C1
C4
C10
R2
R5
C11
Edge of
the Board
Figure 19. Typical Component Placement (Component Side)
VCC
AVCC
Edge of
the Board
VCC
VCC
Figure 20. Typical Split Power Plane (Solder Side)
B–3
B–4
Appendix C
SCLK Frequency > VCLK Frequency
The VCLK and SCLK outputs generated by the TLC34075 are both free-running clocks. The video control
signals (i.e., HSYNC, VSYNC, and BLANK) are normally generated from VCLK, and a fixed relationship
between the video control signals and VCLK can therefore be expected. The TLC34075 samples and
latches the BLANK input on the falling edge of VCLK. It then looks at the LOAD signal to determine when
to disable or enable SCLK at its output terminal. The decision is deterministic when the SCLK frequency
is greater than or equal to the VCLK frequency. However, when the SCLK frequency is less than the VCLK
frequency, the appearance of the SCLK waveform at its output terminal when BLANK is sampled low on the
VCLK falling edge can vary (see Figures C –1 and C – 2).
To avoid this variation in the SCLK output waveform, the SCLK and VCLK frequencies should be chosen
so that HTOTAL is evenly divisible by the ratio of (VCLK frequency:SCLK frequency); that is,
remainder of
ȱȧ
Ȳǒ
HTOTAL
VCLK frequency
SCLK frequency
ȳȧ +
Ǔȴ
0.
For example, if HTOTAL is even, VCLK frequency = DOTCLK frequency/8, and SCLK frequency =
DOTCLK frequency/16, then the formula above is satisfied. NOTE: When HTOTAL starts at zero (as in the
TMS340x0 GSP), then the formula becomes
remainder of
ȱȧ
Ȳǒ
)
ȳȧ +
Ǔȴ
(HTOTAL
1)
VCLK frequency
SCLK frequency
0.
VCLK
BLANK
LOAD
(Internal Signal
for Data Latch)
SCLK at
Output Terminal
Figure 21. VCLK and SCLK Phase Relationship (Case 1)
C–1
VCLK
BLANK
LOAD
(Internal Signal
for Data Latch)
SCLK at
Output Terminal
Figure 2 2. VCLK and SCLK Phase Relationship (Case 2)
C–2
Appendix D
Mechanical Data
FN020, FN028, FN044, FN052, FN068, and FN084
plastic J-leaded chip carrier
Each of these chip carrier packages consists of a circuit mounted on a lead frame and
enncapsulated within an electrically nonconductive plastic compound. The compound
withstands soldering temperatures with no deformation, and circuit performance
characteristics remain stable when the devices are operated in high-humidity conditions.
The package is intended for surface mounting on 1,27 (0.050) centers. Leads require no
additional cleaning or processing when used in soldered assembly.
Designation per JEDEC Std 30:
S-PLCC-J20
S-PLCC-J28
S-PLCC-J44
S-PLCC-J52
S-PLCC-J68
S-PLCC-J84
FN020, FN028, FN044, FN052, FN068, and FN084
(20-PIN package used for illustration)
D
0.18 (0.007) S B S D–E S
–A–
D1 (see Note B)
0.18 (0.007) S B S
D–E S
0,51 (0.020) R. MAX
3 Places
(0.002 IN./IN.) B
–D–
(see Note C)
F–G S
(see Note C)
–F–
4
(0.002 IN./IN.) A
E1(see Note B)
0,18 (0.007) S A S
–B–
E
0,18 (0.007) S A S
F–G S
1,22 (0.048) 2 Places
1,07 (0.042)
3
2
1
17
6
16
7
15
8
14
9
0.10 (0.004)
1,42 (0.056)
1,07 (0.042)
0,81 (0.032)
TYP
0,66 (0.026)
20 19 18
5
A
–H– (see Note D)
Seating Plane
A1
(see Note B)
–C–
1,14 (0.045)
R. TYP
0,64 (0.025)
0.18 (0.007) S B S A S
D 2 , E2
(see Note
F)
2 Sides (see Note E)
D 3 , E3
(see Note
1,27 (0.050) T.P.
4 Sides
F)
–G–
0.38 (0.015) S D–E S
0.38 (0.015) S F–G S
(see Note C)
10 11 12 13
–E–
(see Note C)
0,51 (0.020) MIN
0,36 (0.014)
0,20 (0.008)
(Includes Lead Finish)
Sum of Dam Bar Protrusions
to be 0,18 (0.007) Maximum
Per Lead
1,52 (0.060) MIN
–C–
0,53 (0.021)
0,33 (0.013)
0,64 (0.025)
MIN
0.18 (0.007) M F–G S
0.18 (0.007) M D–E S
(see table on following page for additional dimensions)
ALL LINEAR DIMENSIONS ARE IN MILLIMETERS AND PARENTHETICALLY IN INCHES
NOTES: A. All dimensions conform to JEDEC Specification MO-047AA/AF. Dimensions and tolerancing are per ANSI
Y14.5M – 1982.
B. Dimensions D1 and E1 do not include mold flash protrusion. Protrusion shall not exceed 0,25 (0.010) on any
side. Centerline of center pin each side is within 0,10 (0.004) of package centerline by dimension B. The lead
contact points are planar within 0,10 (0.004).
C. Datums D – E and F – G for center leads are determined at datum – H – .
D. Datum – H – is located at top of leads where they exit plastic body.
E. Location of datums – A –
and – B –
to be determined at datum – H – .
F. Determined at seating plane – C – .
D-1
Mechanical Data
JEDEC
NO. OF
A
OUTLINE
PINS
MIN
MAX
MIN
A1
MAX
MIN
D, E
MAX
MIN
D1, E1
MAX
D2, E2
MAX
MO-047AA
20
4,19
(0.165)
4,57
(0.180)
2,29
(0.090)
3,05
(0.120)
9,78
(0.385)
10,03
(0.395)
8,89
(0.350)
9,04
(0.356)
7,37
(0.290)
8,38
(0.330)
5,08
(0.200)
MO-047AB
28
4,19
(0.165)
4,57
(0.180)
2,29
(0.090)
3,05
(0.120)
12,32
(0.485)
12,57
(0.495)
11,43
(0.450)
11,58
(0.456)
9,91
(0.390)
10,92
(0.430)
7,62
(0.300)
MO-047AC
44
4,19
(0.165)
4,57
(0.180)
2,29
(0.090)
3,05
(0.120)
17,40
(0.685)
17,65
(0.695)
16,51
(0.650)
16,66
(0.656)
14,99
(0.590)
16,00
(0.630)
12,70
(0.500)
MO-047AD
52
4,19
(0.165)
5,08
(0.200)
2,29
(0.090)
3,30
(0.130)
19,94
(0.785)
20,19
(0.795)
19,05
(0.750)
19,20
(0.756)
17,53
(0.690)
18,54
(0.730)
15,24
(0.600)
MO-047AE
68
4,19
(0.165)
5,08
(0.200)
2,29
(0.090)
3,30
(0.130)
25,02
(0.985)
25,27
(0.995)
24,13
(0.950)
24,33
(0.958)
22,61
(0.890)
23,62
(0.930)
20,32
(0.800)
MO-047AF
84
4,19
(0.165)
5,08
(0.200)
2,29
(0.090)
3,30
(0.130)
30,10
(1.185)
30,35
(1.195)
29,21
(1.150)
29,41
(1.141)
27,69
(1.090)
28,70
(1.130)
25,40
(1.000)
MIN
D3, E3
BASIC
NOTES: A. All dimensions conform to JEDEC Specification MO-047AA/AF. Dimensions and tolerancing are per ANSI
Y14.5M – 1982.
F Determined at seating plane – C – .
D-2
D-3