CYPRESS W305BH

W305B
Frequency Controller with System Recovery
for Intel Integrated Core Logic
Features
• Thirteen copies of SDRAM clock
• Single chip FTG solution for Intel Solano/810E/810
• Programmable clock output frequency with less than
1 MHz increment
• Integrated fail-safe Watchdog timer for system
recovery
• Automatically switch to HW selected or SW
programmed clock frequency when Watchdog timer
time-out
• Capable of generating system RESET after a Watchdog
timer time-out occurs or a change in output frequency
via SMBus interface
• Support SMBus byte read/write and block read/write
operations to simplify system BIOS development
• Eight copies of PCI clock
• One copy of synchronous APIC clock
• Three copies of 66-MHz outputs
• Three copies of 48-MHz outputs
• One copy of double strength 14.31818-MHz reference
clock
• One RESET output for system recovery
• SMBus interface for turning off unused clocks
Key Specifications
CPU, SDRAM Outputs Cycle-to-Cycle Jitter: ............. 250 ps
• Vendor ID and Revision ID support
APIC, 48-MHz, 3V66, PCI Outputs
Cycle-to-Cycle Jitter:................................................... 500 ps
• Programmable drive strength for SDRAM and PCI
output clocks
CPU, 3V66 Output Skew: ........................................... 175 ps
SDRAM, APIC, 48-MHz Output Skew: ....................... 250 ps
• Programmable output skew between CPU, AGP, PCI
and SDRAM
PCI Output Skew: ....................................................... 500 ps
• Maximized EMI suppression using Cypress’s Spread
Spectrum Technology
CPU to SDRAM Skew (@ 100 MHz) ................. 4.5 to 5.5 ns
• Low jitter and tightly controlled clock skew
• Two copies of CPU clock
REF2X/FS3
XTAL
OSC
PLL REF FREQ
VDDQ2
Divider,
Delay,
and
Phase
Control
Logic
CPU0:1
2
APIC
(FS0:4)
VDDQ3
3V66_0:2
PCI0/FS0
3
PLL 1
PCI1/FS1
PCI2/FS2
PCI3:7
5
SDRAM0:12
13
RST#
VDDQ3
GND
VDDQ3
REF2X/FS3^
X1
X2
VDDQ3
3V66_0
3V66_1
3V66_2
GND
PCI0/FS0^
PCI1/FS1^
PCI2/FS2^
GND
PCI3
PCI4
VDDQ3
PCI5
PCI6
PCI7
GND
48MHz
48MHz/FS4^
24_48MHz/SEL24_48MHz#*
VDDQ3
SDATA
GND
VDDQ3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
W305B
SMBus
Logic
3V66 to PCI Skew (3V66 lead) .......................... 1.5 to 3.5 ns
Pin Configuration [1]
VDDQ3
SDATA
SCLK
CPU to 3V66 Skew (@ 66 MHz)........................ 7.0 to 8.0 ns
PCI to APIC Skew..................................................... ± 0.5 ns
Block Diagram
X1
X2
CPU to SDRAM Skew (@ 133 MHz) ....................... ± 0.5 ns
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
VDDQ2
APIC
GND
VDDQ2
CPU0
CPU1
GND
SDRAM0
SDRAM1
SDRAM2
VDDQ3
GND
SDRAM3
SDRAM4
SDRAM5
SDRAM6
VDDQ3
GND
SDRAM7
SDRAM8
SDRAM9
SDRAM10
VDDQ3
GND
SDRAM11
SDRAM12
RST#
SCLK
48MHz
PLL2
48MHz/FS4
24_48MHz/SEL24_48MHz#
/2
1. Internal 100K pull-up and 100K pull-down resistors present on inputs marked with * and ^ respectively. Design should not rely solely on internal pull-up resistor
to set I/O pins HIGH or LOW.
Cypress Semiconductor Corporation
Document #: 38-07262 Rev. *B
•
3901 North First Street
•
San Jose, CA 95134
•
408-943-2600
Revised September 1, 2004
W305B
Pin Definitions
Pin No.
Pin
Type
REF2X/FS3
3
I/O
X1
4
I
Crystal Input. This pin has dual functions. It can be used as an external
14.318-MHz crystal connection or as an external reference frequency input.
X2
5
O
Crystal Output. An input connection for an external 14.318-MHz crystal
connection. If using an external reference, this pin must be left unconnected.
PCI0/FS0
11
I/O
PCI Clock 0/Frequency Selection 0. 3.3V 33-MHz PCI clock outputs. This pin
also serves as the select strap to determine device operating frequency as
described in Table 5.
PCI1/FS1
12
I/O
PCI Clock 1/Frequency Selection 1. 3.3V 33-MHz PCI clock outputs. This pin
also serves as the select strap to determine device operating frequency as
described in Table 5.
PCI2/FS2
13
I/O
PCI Clock 2/Frequency Selection 2. 3.3V 33-MHz PCI clock outputs. This pin
also serves as the select strap to determine device operating frequency as
described in Table 5.
15, 16, 18, 19, 20
O
PCI Clock 3 through 7. 3.3V 33-MHz PCI clock outputs. PCI0:7 can be individually turned off via SMBus interface.
7, 8, 9
O
66-MHz Clock Output. 3.3V output clocks. The operating frequency is
controlled by FS0:4 (see Table 5).
48MHz
22
O
48MHz. 3.3V 48-MHz non-spread spectrum output.
48MHz/FS4
23
I/O
48-MHz Output/Frequency Selection 4. 3.3V 48-MHz non-spread spectrum
output. This pin also serves as the select strap to determine device operating
frequency as described in Table 5.
24_48MHz/SEL24
_48MHz#
24
I/O
24- or 48-MHz Output/Select 24 or 48MHz. 3.3V 24 or 48-MHz non-spread
spectrum output. This pin also serves as the select strap to determine the output
frequency for 24_48MHz output.
RST#
30
Pin Name
PCI3:7
3V66_0:2
CPU0:1
Pin Description
Reference Clock with 2x Drive/Frequency Select 3. 3.3V 14.318-MHz clock
output. This pin also serves as the select strap to determines device operating
frequency as described in Table 5.
O
Reset#. Open-drain RESET# output.
(open-d
rain)
52, 51
O
49, 48, 47, 44,
43, 42, 41, 38,
37, 36, 35, 32, 31
O
APIC
55
O
Synchronous APIC Clock Outputs. Clock outputs running synchronous with
the PCI clock outputs. Voltage swing set by VDDQ2.
SDATA
26
I/O
Data pin for SMBus circuitry.
SDRAM0:12,
SCLK
CPU Clock Outputs. Clock outputs for the host bus interface. Output
frequencies depending on the configuration of FS0:4. Voltage swing is set by
VDDQ2.
SDRAM Clock Outputs. 3.3V outputs for SDRAM and chipset. The operating
frequency is controlled by FS0:4 (see Table 5).
29
I
Clock pin for SMBus circuitry.
VDDQ3
2, 6, 17, 25, 28,
34, 40, 46
P
3.3V Power Connection. Power supply for SDRAM output buffers, PCI output
buffers, reference output buffers and 48-MHz output buffers. Connect to 3.3V.
VDDQ2
53, 56
P
2.5V Power Connection. Power supply for APIC and CPU output buffers.
Connect to 2.5V.
1, 10, 14, 21, 27,
33, 39, 45, 50, 54
G
Ground Connections. Connect all ground pins to the common system ground
plane.
GND
Document #: 38-07262 Rev. *B
Page 2 of 21
W305B
Output Strapping Resistor
Series Termination Resistor
W305B
Clock Load
Output
Buffer
Power-on
Reset
Timer
Hold
Output
Low
Output Three-state
Q
10 kΩ
D
Data
Latch
Figure 1. Input Logic Selection Through Resistor Load Option
Overview
The W305B is a highly integrated frequency timing generator,
supplying all the required clock sources for an Intel® architecture platform using graphics integrated core logic.
Functional Description
I/O Pin Operation
Upon power-up the power on strap option pins act as a logic
input. An external 10-kΩ strapping resistor should be used.
Figure 1 shows a suggested method for strapping resistor
connections.
10 ns
0 ns
Offsets Among Clock Signal Groups
Figure 2, Figure 3, and Figure 4 represent the phase
relationship among the different groups of clock outputs from
W305B under different frequency modes.
30 ns
40 ns
CPU 66 Period
CPU 66-MHz
SDRAM 100-MHz
3V66 66-MHz
20 ns
After 2 ms, the pin becomes an output. Assuming the power
supply has stabilized by then, the specified output frequency
is delivered on the pins. If the power supply has not yet
reached full value, output frequency initially may be below
target but will increase to target once supply voltage has stabilized. In either case, a short output clock cycle may be
produced from the CPU clock outputs when the outputs are
enabled.
SDRAM 100 Period
Hub-PCI
PCI 33-MHz
REF 14.318-MHz
USB 48-MHz
APIC 16.6-MHz
Figure 2. Group Offset Waveforms (66-MHz CPU Clock, 100-MHz SDRAM Clock)
Document #: 38-07262 Rev. *B
Page 3 of 21
W305B
0 ns
CPU 100-MHz
10 ns
20 ns
30 ns
40 ns
CPU 100 Period
SDRAM 100 Period
SDRAM 100-MHz
3V66 66-MHz
Hub-PC
PCI 33-MHz
REF 14.318-MHz
USB 48-MHz
APIC16.6-MHz
Figure 3. Group Offset Waveforms (100-MHz CPU Clock, 100-MHz SDRAM Clock)
0 ns
10 ns
20 ns
30 ns
40 ns
Cycle Repeats
CPU 133-MHz
SDRAM 100-MHz
3V66 66-MHz
PCI 33-MHz
APIC 16.6-MHz
REF 14.318-MHz
USB 48-MHz
DOT 48-MHz
Figure 4. Group Offset Waveforms (133-MHz CPU/100-MHz SDRAM)
Document #: 38-07262 Rev. *B
Page 4 of 21
W305B
0 ns
10 ns
20 ns
30 ns
40 ns
Cycle Repeat
CPU 133-MHz
SDRAM 133MHz
3V66 66-MHz
PCI 33-MHz
APIC 16.6-MHz
REF 14.318-MHz
USB 48-MHz
DOT 48-MHz
Figure 5. Group Offset Waveform (133-MHz CPU/133-MHz SDRAM)
Serial Data Interface
The W305B features a two-pin, serial data interface that can
be used to configure internal register settings that control
particular device functions.
Data Protocol
The clock driver serial protocol supports byte/word write,
byte/word read, block write and block read operations from the
controller. For block write/read operation, the bytes must be
accessed in sequential order from lowest to highest byte with
the ability to stop after any complete byte has been transferred. For byte/word write and byte read operations, system
controller can access individual indexed byte. The offset of the
indexed byte is encoded in the command code.
The definition for the command code is given in Table 1.
Table 1. Command Code Definition
Bit
Descriptions
7
0 = Block read or block write operation
1 = Byte/Word read or byte/word write operation
6:0
Byte offset for byte/word read or write operation. For block read or write operations, these bits
need to be set at ‘0000000’.
Table 2. Block Read and Block Write Protocol
Block Write Protocol
Bit
1
2:8
Description
Start
Slave address – 7 bit
9
Write
10
Acknowledge from slave
11:18
19
20:27
28
29:36
37
38:45
Command Code – 8 bit
‘00000000’ stands for block operation
Acknowledge from slave
Byte Count – 8 bits
Acknowledge from slave
Block Read Protocol
Bit
1
2:8
Description
Start
Slave address – 7 bit
9
Write
10
Acknowledge from slave
11:18
Command Code – 8 bit
‘00000000’ stands for block operation
19
Acknowledge from slave
20
Repeat start
21:27
Slave address – 7 bits
Data byte 0 – 8 bits
28
Read
Acknowledge from slave
29
Acknowledge from slave
Data byte 1 – 8 bits
46
Acknowledge from slave
...
Data Byte N/Slave Acknowledge...
Document #: 38-07262 Rev. *B
30:37
38
39:46
Byte count from slave – 8 bits
Acknowledge
Data byte from slave – 8 bits
Page 5 of 21
W305B
Table 2. Block Read and Block Write Protocol (continued)
Block Write Protocol
Bit
...
Description
Data Byte N – 8 bits
...
Acknowledge from slave
...
Stop
Block Read Protocol
Bit
47
48:55
56
Description
Acknowledge
Data byte from slave – 8 bits
Acknowledge
...
Data bytes from slave/Acknowledge
...
Data byte N from slave – 8 bits
...
Not Acknowledge
...
Stop
Table 3. Word Read and Word Write Protocol
Word Write Protocol
Bit
1
2:8
Description
Start
Word Read Protocol
Bit
1
Slave address – 7 bit
2:8
Description
Start
Slave address – 7 bit
9
Write
9
Write
10
Acknowledge from slave
10
Acknowledge from slave
11:18
19
20:27
28
29:36
Command Code – 8 bit
‘1xxxxxxx’ stands for byte or word operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
11:18
Command Code – 8 bit
‘1xxxxxxx’ stands for byte or word operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
Acknowledge from slave
19
Acknowledge from slave
Data byte low– 8 bits
20
Repeat start
Acknowledge from slave
Data byte high – 8 bits
37
Acknowledge from slave
38
Stop
21:27
Slave address – 7 bits
28
Read
29
Acknowledge from slave
30:37
38
39:46
Data byte low from slave – 8 bits
Acknowledge
Data byte high from slave – 8 bits
47
NOT acknowledge
48
Stop
Table 4. Byte Read and Byte Write Protocol
Byte Write Protocol
Bit
1
2:8
Description
Start
Slave address – 7 bit
Byte Read Protocol
Bit
1
2:8
Description
Start
Slave address – 7 bit
9
Write
9
Write
10
Acknowledge from slave
10
Acknowledge from slave
11:18
19
20:27
Command Code – 8 bit
‘1xxxxxxx’ stands for byte operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
11:18
Command Code – 8 bit
‘1xxxxxxx’ stands for byte operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
Acknowledge from slave
19
Acknowledge from slave
Data byte – 8 bits
20
Repeat start
28
Acknowledge from slave
29
Stop
Document #: 38-07262 Rev. *B
21:27
28
Slave address – 7 bits
Read
Page 6 of 21
W305B
Table 4. Byte Read and Byte Write Protocol (continued)
Byte Write Protocol
Bit
Byte Read Protocol
Description
Bit
29
30:37
Description
Acknowledge from slave
Data byte from slave – 8 bits
38
Not Acknowledge
39
Stop
W305B Serial Configuration Map
Byte N – Bits 7, 6, 5, 4, 3, 2, 1, 0
The serial bits will be read by the clock driver in the following
order:
All unused register bits (reserved and N/A) should be written
to a “0” level.
Byte 0 – Bits 7, 6, 5, 4, 3, 2, 1, 0
All register bits labeled “Initialize to 0” must be written to zero
during initialization.
Byte 1 – Bits 7, 6, 5, 4, 3, 2, 1, 0
Byte 0: Control Register 0
Bit
Pin#
Name
Default
Description
Bit 7
-
SEL4
0
See Table 5
Bit 6
-
SEL3
0
See Table 5
Bit 5
-
SEL2
0
See Table 5
Bit 4
-
SEL1
0
See Table 5
Bit 3
-
SEL0
0
See Table 5
Bit 2
-
Spread Select2
0
‘000’ = Normal (spread off)
Bit 1
-
Spread Select1
0
‘001’ = Test Mode
Bit 0
-
Spread Select0
0
‘010’ = Reserved
‘011’ = Three-Stated
‘100’ = –0.5%
‘101’ = ±0.5%
‘110’ = ±0.25%
‘111’ = ±0.38%
Byte 1: Control Register 1
Bit
Pin#
Name
Default
Bit 7
23
Latched FS4 input
X
Bit 6
3
Latched FS3 input
X
Bit 5
13
Latched FS2 input
X
Bit 4
12
Latched FS1 input
X
Bit 3
11
Latched FS0 input
X
Bit 2
-
Reserved
0
Description
Latched FS[4:0] inputs. These bits are read only.
Reserved
Bit 1
3
REF2X
1
(Active/Inactive)
Bit 0
-
Reserved
0
Reserved
Byte 2: Control Register 2
Bit
Pin#
Name
Default
Description
Bit 7
20
PCI7
1
(Active/Inactive)
Bit 6
19
PCI6
1
(Active/Inactive)
Bit 5
18
PCI5
1
(Active/Inactive)
Bit 4
16
PCI4
1
(Active/Inactive)
Document #: 38-07262 Rev. *B
Page 7 of 21
W305B
Byte 2: Control Register 2 (continued)
Bit
Pin#
Name
Default
Description
Bit 3
15
PCI3
1
(Active/Inactive)
Bit 2
13
PCI2
1
(Active/Inactive)
Bit 1
12
PCI1
1
(Active/Inactive)
Bit 0
11
PCI0
1
(Active/Inactive)
Byte 3: Control Register 3
Bit
Pin#
Name
Default
Description
Bit 7
9
3V66_2
1
(Active/Inactive)
Bit 6
8
3V66_1
1
(Active/Inactive)
Bit 5
7
3V66_0
1
(Active/Inactive)
Bit 4
55
APIC
1
(Active/Inactive)
Bit 3
-
Reserved
0
Reserved
Bit 2
-
Reserved
0
Reserved
Bit 1
51
CPU1
1
(Active/Inactive)
Bit 0
52
CPU0
1
(Active/Inactive)
Byte 4: Control Register 4
Bit
Pin#
Name
Default
Description
Bit 7
38
SDRAM7
1
(Active/Inactive)
Bit 6
41
SDRAM6
1
(Active/Inactive)
Bit 5
42
SDRAM5
1
(Active/Inactive)
Bit 4
43
SDRAM4
1
(Active/Inactive)
Bit 3
44
SDRAM3
1
(Active/Inactive)
Bit 2
47
SDRAM2
1
(Active/Inactive)
Bit 1
48
SDRAM1
1
(Active/Inactive)
Bit 0
49
SDRAM0
1
(Active/Inactive)
Byte 5: Control Register 5
Bit
Pin#
Name
Default
Description
Bit 7
-
Reserved
0
Reserved
Bit 6
-
Reserved
0
Reserved
Bit 5
-
Reserved
0
Reserved
Bit 4
31
SDRAM12
1
(Active/Inactive)
Bit 3
32
SDRAM11
1
(Active/Inactive)
Bit 2
35
SDRAM10
1
(Active/Inactive)
Bit 1
36
SDRAM9
1
(Active/Inactive)
Bit 0
37
SDRAM8
1
(Active/Inactive)
Document #: 38-07262 Rev. *B
Page 8 of 21
W305B
Byte 6: Vendor ID & Revision ID Register (Read Only)
Bit
Name
Default
Pin Description
Bit 7
Revision_ID3
0
Revision ID bit[3]
Bit 6
Revision_ID2
0
Revision ID bit[2]
Bit 5
Revision_ID1
0
Revision ID bit[1]
Bit 4
Revision_ID0
0
Revision ID bit[0]
Bit 3
Vendor_ID3
1
Bit[3] of Cypress Semiconductor’s Vendor ID. This bit is read only.
Bit 2
Vendor_ID2
0
Bit[2] of Cypress Semiconductor’s Vendor ID. This bit is read only.
Bit 1
Vendor _ID1
0
Bit[1] of Cypress Semiconductor’s Vendor ID. This bit is read only.
Bit 0
Vendor _ID0
0
Bit[0] of Cypress Semiconductor’s Vendor ID. This bit is read only.
Byte 7: Control Register 7
Bit
Pin#
Name
Reserved
Default
0
Pin Description
Bit 7
-
Reserved
Bit 6
24
24_48MHz_DRV
1
0 = Norm, 1 = High Drive
Bit 5
23
48MHz_DRV
1
0 = Norm, 1 = High Drive
Bit 4
22
48MHz_DRV
1
0 = Norm, 1 = High Drive
Bit 3
24
24_48MHz
1
(Active/Inactive)
Bit 2
23
48 MHz
1
(Active/Inactive)
Bit 1
22
48 MHz
1
(Active/Inactive)
Bit 0
--
Reserved
0
Reserved
Byte 8: Watchdog Timer Register
Bit
Name
Default
Bit 7
PCI_Skew1
0
Bit 6
PCI_Skew0
0
Bit 5
WD_TIMER4
1
Bit 4
WD_TIMER3
1
Bit 3
WD_TIMER2
1
Bit 2
WD_TIMER1
1
Bit 1
WD_TIMER0
1
Bit 0
WD_PRE_SCALER
0
Pin Description
PCI skew control
00 = Normal
01 = –500ps
10 = Reserved
11 = +500ps
These bits store the time-out value of the Watchdog timer. The scale of the
timer is determine by the pre-scaler.
The timer can support a value of 150 ms to 4.8 sec when the pre-scaler is set
to 150 ms. If the pre-scaler is set to 2.5 sec, it can support a value from 2.5
sec. to 80 sec.
When the Watchdog timer reaches “0”, it will set the WD_TO_STATUS bit.
0 = 150 ms
1 = 2.5 sec
Byte 9: System RESET and Watchdog Timer Register
Bit
Name
Default
Pin Description
Bit 7
SDRAM_DRV
0
SDRAM clock output drive strength
0 = Normal
1 = High Drive
Bit 6
PCI_DRV
0
PCI clock output drive strength
0 = Normal
1 = High Drive
Bit 5
FS_Override
0
0 = Select operating frequency by FS[4:0] input pins
1 = Select operating frequency by SEL[4:0] settings
Document #: 38-07262 Rev. *B
Page 9 of 21
W305B
Byte 9: System RESET and Watchdog Timer Register (continued)
Bit
Name
Default
Pin Description
Bit 4
RST_EN_WD
0
This bit will enable the generation of a Reset pulse when a watchdog timer
time-out occurs.
0 = Disabled
1 = Enabled
Bit 3
RST_EN_FC
0
This bit will enable the generation of a Reset pulse after a frequency change
occurs.
0 = Disabled
1 = Enabled
Bit 2
WD_TO_STATUS
0
Watchdog Timer Time-out Status bit
0 = No time-out occurs (READ); Ignore (WRITE)
1 = time-out occurred (READ); Clear WD_TO_STATUS (WRITE)
Bit 1
WD_EN
0
0 = Stop and re-load Watchdog timer. Unlock W305B from recovery frequency
mode.
1 = Enable Watchdog timer. It will start counting down after a frequency change
occurs.
Note: W305B will generate system reset, re-load a recovery frequency, and
lock itself into a recovery frequency mode after a Watchdog timer time-out
occurs. Under recovery frequency mode, W305B will not respond to any attempt
to change output frequency via the SMBus control bytes. System software can
unlock W305B from its recovery frequency mode by clearing the WD_EN bit.
Bit 0
Reserved
0
Reserved
Byte 10: Skew Control Register
Bit
Name
Default
Bit 7
CPU_Skew2
0
Bit 6
CPU_Skew1
0
Bit 5
CPU_Skew0
0
Bit 4
SDRAM_Skew2
0
Bit 3
SDRAM_Skew1
0
Bit 2
SDRAM_Skew0
0
Bit 1
AGP_Skew1
0
Bit 0
AGP_Skew0
0
Document #: 38-07262 Rev. *B
Description
CPU skew control
000 = Normal
001 = –150 ps
010 = –300 ps
011 = –450 ps
100 = +150 ps
101 = +300 ps
110 = +450 ps
111 = +600 ps
SDRAM skew control
000 = Normal
001 = –150 ps
010 = –300 ps
011 = –450 ps
100 = +150 ps
101 = +300 ps
110 = +450 ps
111 = +600 ps
AGP skew control
00 = Normal
01 = –150ps
10 = +150ps
11 = +300ps
Page 10 of 21
W305B
Byte 11: Recovery Frequency N-Value Register
Bit
Name
Default
Pin Description
Bit 7
ROCV_FREQ_N7
0
Bit 6
ROCV_FREQ_N6
0
Bit 5
ROCV_FREQ_N5
0
Bit 4
ROCV_FREQ_N4
0
Bit 3
ROCV_FREQ_N3
0
Bit 2
ROCV_FREQ_N2
0
Bit 1
ROCV_FREQ_N1
0
Bit 0
ROCV_FREQ_N0
0
If ROCV_FREQ_SEL is set, W305B will use the values programmed in
ROCV_FREQ_N[7:0] and ROCV_FREQ_M[6:0] to determine the recovery
CPU output frequency.when a Watchdog timer time-out occurs
The setting of FS_Override bit determines the frequency ratio for CPU,
SDRAM, AGP and SDRAM. When it is cleared, W305b will use the same
frequency ratio stated in the Latched FS[4:0] register. When it is set, W305B
will use the frequency ratio stated in the SEL[4:0] register.
W305B supports programmable CPU frequency ranging from 50 MHz to
248 MHz.
W305Bwill change the output frequency whenever there is an update to either
ROCV_FREQ_N[7:0] and ROCV_FREQ_M[6:0]. Therefore, it is recommended to use Word or Block write to update both registers within the same
SMBus bus operation.
Byte 12: Recovery Frequency M-Value Register
Bit
Name
Default
Pin Description
Bit 7
ROCV_FREQ_SEL
0
ROCV_FREQ_SEL determines the source of the recover frequency when a
Watchdog timer time-out occurs. The clock generator will automatically switch
to the recovery CPU frequency based on the selection on ROCV_FREQ_SEL.
0 = From latched FS[4:0]
1 = From the settings of ROCV_FREQ_N[7:0] & ROCV_FREQ_M[6:0]
Bit 6
ROCV_FREQ_M6
0
Bit 5
ROCV_FREQ_M5
0
Bit 4
ROCV_FREQ_M4
0
Bit 3
ROCV_FREQ_M3
0
Bit 2
ROCV_FREQ_M2
0
Bit 1
ROCV_FREQ_M1
0
Bit 0
ROCV_FREQ_M0
0
If ROCV_FREQ_SEL is set, W305B will use the values programmed in
ROCV_FREQ_N[7:0] and ROCV_FREQ_M[6:0] to determine the recovery
CPU output frequency.when a Watchdog timer time-out occurs
The setting of FS_Override bit determines the frequency ratio for CPU,
SDRAM, AGP and SDRAM. When it is cleared, W305b will use the same
frequency ratio stated in the Latched FS[4:0] register. When it is set, W305B
will use the frequency ratio stated in the SEL[4:0] register.
W305B supports programmable CPU frequency ranging from 50 MHz to
248 MHz.
W305B will change the output frequency whenever there is an update to either
ROCV_FREQ_N[7:0] and ROCV_FREQ_M[6:0]. Therefore, it is recommended to use Word or Block write to update both registers within the same
SMBus bus operation.
Byte 13: Programmable Frequency Select N-Value Register
Bit
Name
Default
Pin Description
If Prog_Freq_EN is set, W305B will use the values programmed in
CPU_FSEL_N[7:0] and CPU_FSEL_M[6:0] to determine the CPU output
frequency. The new frequency will start to load whenever CPU_FSELM[6:0]
is updated.
The setting of FS_Override bit determines the frequency ratio for CPU,
SDRAM, AGP and SDRAM. When it is cleared, W305B will use the same
frequency ratio stated in the Latched FS[4:0] register. When it is set, W305B
will use the frequency ratio stated in the SEL[4:0] register.
W305B supports programmable CPU frequency ranging from 50 MHz to
248 MHz.
Bit 7
CPU_FSEL_N7
0
Bit 6
CPU_FSEL_N6
0
Bit 5
CPU_FSEL_N5
0
Bit 4
CPU_FSEL_N4
0
Bit 3
CPU_FSEL_N3
0
Bit 2
CPU_FSEL_N2
0
Bit 1
CPU_FSEL_N1
0
Bit 0
CPU_FSEL_N0
0
Document #: 38-07262 Rev. *B
Page 11 of 21
W305B
Byte 14: Programmable Frequency Select M-Value Register
Bit
Name
Default
Description
Bit 7
Pro_Freq_EN
0
Programmable output frequencies enabled
0 = disabled
1 = enabled
Bit 6
CPU_FSEL_M6
0
Bit 5
CPU_FSEL_M5
0
Bit 4
CPU_FSEL_M4
0
Bit 3
CPU_FSEL_M3
0
Bit 2
CPU_FSEL_M2
0
Bit 1
CPU_FSEL_M1
0
Bit 0
CPU_FSEL_M0
0
If Prog_Freq_EN is set, W305B will use the values programmed in
CPU_FSEL_N[7:0] and CPU_FSEL_M[6:0] to determine the CPU output
frequency. The new frequency will start to load whenever CPU_FSELM[6:0] is
updated.
The setting of FS_Override bit determines the frequency ratio for CPU,
SDRAM, AGP and SDRAM. When it is cleared, W305B will use the same
frequency ratio stated in the Latched FS[4:0] register. When it is set, W305B
will use the frequency ratio stated in the SEL[4:0] register.
W305B supports programmable CPU frequency ranging from 50 MHz to
248 MHz.
Byte 15: Reserved Register
Bit
Pin#
Name
Default
Description
Bit 7
-
Reserved
0
Reserved
Bit 6
-
Reserved
0
Reserved
Bit 5
-
Reserved
0
Reserved
Bit 4
-
Reserved
0
Reserved
Bit 3
-
Reserved
0
Reserved
Bit 2
-
Reserved
0
Reserved
Bit 1
-
Reserved
1
Reserved. Write with ‘1’
Bit 0
-
Reserved
1
Reserved. Write with ‘1’
Byte 16: Reserved Register
Bit
Pin#
Name
Default
Description
Bit 7
-
Reserved
0
Reserved
Bit 6
-
Reserved
0
Reserved
Bit 5
-
Reserved
0
Reserved
Bit 4
-
Reserved
0
Reserved
Bit 3
-
Reserved
0
Reserved
Bit 2
-
Reserved
0
Reserved
Bit 1
-
Reserved
0
Reserved
Byte 17: Reserved Register
Bit
Pin#
Name
Default
Description
Bit 7
-
Reserved
0
Reserved
Bit 6
-
Reserved
0
Reserved
Bit 5
-
Reserved
0
Reserved
Bit 4
-
Reserved
0
Reserved
Bit 3
-
Reserved
0
Reserved
Bit 2
-
Reserved
0
Reserved
Bit 1
-
Reserved
0
Reserved
Document #: 38-07262 Rev. *B
Page 12 of 21
W305B
Table 5. Additional Frequency Selections through Serial Data Interface Data Bytes
Input Conditions
Output Frequency
FS4
FS3
FS2
FS1
FS0
SEL4
SEL3
SEL2
SEL1
SEL0
CPU
SDRAM
3V66
PCI
APIC
PLL Gear
Constants
(G)
0
0
0
0
0
66.6
100.0
66.6
33.3
16.6
32.00494
0
0
0
0
1
120.0
120.0
80.0
40.0
20.0
48.00741
0
0
0
1
0
66.8
100.2
66.8
33.4
16.7
32.00494
0
0
0
1
1
68.3
102.5
68.3
34.2
17.1
32.00494
0
0
1
0
0
70.0
105.0
70.0
35.0
17.5
32.00494
0
0
1
0
1
75.0
112.5
75.0
37.5
18.8
32.00494
0
0
1
1
0
80.0
120.0
80.0
40.0
20.0
32.00494
0
0
1
1
1
83.0
124.5
83.0
41.5
20.8
32.00494
0
1
0
0
0
100.0
100.0
66.6
33.3
16.6
48.00741
0
1
0
0
1
124.0
124.0
82.6
41.3
20.6
48.00741
0
1
0
1
0
100.2
100.2
66.8
33.4
16.7
48.00741
0
1
0
1
1
103.0
103.0
68.9
34.3
17.2
48.00741
0
1
1
0
0
105.0
105.0
70.0
35.0
17.5
48.00741
0
1
1
0
1
110.0
110.0
73.3
36.7
18.3
48.00741
0
1
1
1
0
115.0
115.0
76.6
38.3
19.1
48.00741
0
1
1
1
1
200.0
200.0
66.6
33.3
16.6
96.01482
1
0
0
0
0
133.3
133.3
66.6
33.3
16.6
64.00988
1
0
0
0
1
166.6
166.6
83.3
41.6
20.8
64.00988
1
0
0
1
0
133.6
133.6
66.8
33.4
16.7
64.00988
1
0
0
1
1
137.0
137.0
68.5
34.3
17.1
64.00988
1
0
1
0
0
140.0
140.0
70.0
35.0
17.5
64.00988
1
0
1
0
1
145.0
145.0
72.5
36.2
18.1
64.00988
1
0
1
1
0
150.0
150.0
75.0
37.5
18.7
64.00988
1
0
1
1
1
160.0
160.0
80.0
40.0
20.0
64.00988
1
1
0
0
0
133.3
100.0
66.6
33.3
16.6
64.00988
1
1
0
0
1
166.6
125.0
83.3
41.7
20.8
64.00988
1
1
0
1
0
133.6
100.2
66.8
33.4
16.7
64.00988
1
1
0
1
1
137.0
102.8
68.5
34.3
17.1
64.00988
1
1
1
0
0
66.6
100.0
66.6
33.3
16.6
32.00494
1
1
1
0
1
100.0
100.0
66.6
33.3
16.6
48.00741
1
1
1
1
0
133.3
133.3
66.6
33.3
16.6
64.00988
1
1
1
1
1
133.3
100.0
66.6
33.3
16.6
64.00988
Document #: 38-07262 Rev. *B
Page 13 of 21
W305B
Programmable Output Frequency, Watchdog
Timer and Recovery Output Frequency
Functional Description
The Programmable Output Frequency feature allows users to
generate any CPU output frequency from the range of 50 MHz
to 248 MHz. Cypress offers the most dynamic and the simplest
programming interface for system developers to utilize this
feature in their platforms.
The Watchdog Timer and Recovery Output Frequency
features allow users to implement a recovery mechanism
when the system hangs or getting unstable. System BIOS or
other control software can enable the Watchdog timer before
they attempt to make a frequency change. If the system hangs
and a Watchdog timer time-out occurs, a system reset will be
generated and a recovery frequency will be activated.
All the related registers are summarized in the following table.
Table 6. Register Summary
Name
Pro_Freq_EN
Description
Programmable output frequencies enabled
0 = disabled (default)
1 = enabled
When it is disabled, the operating output frequency will be determined by either the latched value of
FS[4:0] inputs or the programmed value of SEL[4:0]. If FS_Override bit is clear, latched FS[4:0] inputs
will be used. If FS_Override bit is set, programmed value of SEL[4:0] will be used.
When it is enabled, the CPU output frequency will be determined by the programmed value of
CPUFSEL_N, CPUFSEL_M and the PLL Gear Constant. The program value of FS_Override, SEL[4:0]
or the latched value of FS[4:0] will determine the PLL Gear Constant and the frequency ratio between
CPU and other frequency outputs
FS_Override
When Pro_Freq_EN is cleared or disabled,
0 = Select operating frequency by FS input pins (default)
1 = Select operating frequency by SEL bits in SMBus control bytes
When Pro_Freq_EN is set or enabled,
0 = Frequency output ratio between CPU and other frequency groups and the PLL Gear Constant are
based on the latched value of FS input pins (default)
1 = Frequency output ratio between CPU and other frequency groups and the PLL Gear Constant are
based on the programmed value of SEL bits in SMBus control bytes
CPU_FSEL_N,
CPU_FSEL_M
When Prog_Freq_EN is set or enabled, the values programmed in CPU_FSEL_N[7:0] and
CPU_FSEL_M[6:0] determines the CPU output frequency. The new frequency will start to load
whenever there is an update to either CPU_FSEL_N[7:0] or CPU_FSEL_M[6:0]. Therefore, it is recommended to use Word or Block write to update both registers within the same SMBus bus operation.
The setting of FS_Override bit determines the frequency ratio for CPU, SDRAM, AGP and SDRAM.
When FS_Override is cleared or disabled, the frequency ratio follows the latched value of the FS input
pins. When FS_Override is set or enabled, the frequency ratio follows the programmed value of SEL
bits in SMBus control bytes.
ROCV_FREQ_SEL
ROCV_FREQ_SEL determines the source of the recover frequency when a Watchdog timer time-out
occurs. The clock generator will automatically switch to the recovery CPU frequency based on the
selection on ROCV_FREQ_SEL.
0 = From latched FS[4:0]
1 = From the settings of ROCV_FREQ_N[7:0] & ROCV_FREQ_M[6:0]
ROCV_FREQ_N[7:0],
ROCV_FREQ_M[6:0]
When ROCV_FREQ_SEL is set, the values programmed in ROCV_FREQ_N[7:0] and
ROCV_FREQ_M[6:0] will be used to determine the recovery CPU output frequency when a Watchdog
timer time-out occurs
The setting of FS_Override bit determines the frequency ratio for CPU, SDRAM, AGP and SDRAM.
When it is cleared, the same frequency ratio stated in the Latched FS[4:0] register will be used.
When it is set, the frequency ratio stated in the SEL[4:0] register will be used.
The new frequency will start to load whenever there is an update to either ROCV_FREQ_N[7:0] and
ROCV_FREQ_M[6:0]. Therefore, it is recommended to use Word or Block write to update both registers
within the same SMBus bus operation.
Document #: 38-07262 Rev. *B
Page 14 of 21
W305B
Table 6. Register Summary (continued)
Name
Description
WD_EN
0 = Stop and re-load Watchdog timer. Unlock W305B from recovery frequency mode.
1 = Enable Watchdog timer. It will start counting down after a frequency change occurs.
Note. W305B will generate system reset, re-load a recovery frequency, and lock itself into a recovery
frequency mode after a Watchdog timer time-out occurs. Under recovery frequency mode, W305B will
not respond to any attempt to change output frequency via the SMBus control bytes. System software
can unlock W305B from its recovery frequency mode by clearing the WD_EN bit.
WD_TO_STATUS
Watchdog Timer Time-out Status bit
0 = No time-out occurs (READ); Ignore (WRITE)
1 = time-out occurred (READ); Clear WD_TO_STATUS (WRITE)
WD_TIMER[4:0]
These bits store the time-out value of the Watchdog timer. The scale of the timer is determine by the
pre-scaler.
The timer can support a value of 150 ms to 4.8 sec. when the pre-scaler is set to 150 ms. If the pre-scaler
is set to 2.5 sec, it can support a value from 2.5 sec to 80 sec.
When the Watchdog timer reaches “0”, it will set the WD_TO_STATUS bit.
WD_PRE_SCALER
0 = 150 ms
1 = 2.5 sec
RST_EN_WD
This bit will enable the generation of a Reset pulse when a watchdog timer time-out occurs.
0 = Disabled
1 = Enabled
RST_EN_FC
This bit will enable the generation of a Reset pulse after a frequency change occurs.
0 = Disabled
1 = Enabled
How to Program CPU Output Frequency
When the programmable output frequency feature is enabled
(Pro_Freq_EN bit is set), the CPU output frequency is determined by the following equation:
Fcpu = G * (N+3)/(M+3)
“N” and “M” are the values programmed in Programmable
Frequency Select N-Value Register and M-Value Register,
respectively.
“G” stands for the PLL Gear Constant, which is determined by
the programmed value of FS[4:0] or SEL[4:0]. The value is
listed in Table 5.
The following table lists the recommended frequency output
ranges for each PLL Gear Constant and its associated Bus
Frequency Ratio so that the maximum AGP and PCI output
frequencies are less than or equal to 83.1 MHz and 41.5 MHz,
respectively.
Table 7. Recommended CPU Frequency Range for Different PLL Gear Ratio
Recommended Output Frequency Range (CPU/SDRAM/AGP/PCI)
Gear Constants
Bus Frequency Ratio
(CPU/SDRAM/AGP/PCI)
Lower Limits
(N=77, M=48)
Upper Limits
(N=106, M=39)
G1 (32.00494)
66 / 100 / 66 / 33
50.2 / 75.8 / 50.2 / 25.1
83.1 / 124.7 / 83.1 / 41.5
G2 (48.00741)
100 / 100 / 66 / 33
75.3 / 75.3 / 50.2 / 25.1
124.6 / 124.6 / 83.1 / 41.5
G3 (64.00988)
133 / 133 / 66 / 33
or
133 / 100 / 66 / 33
100.4 / 100.4 / 50.2 / 25.1
or
100.4 / 75.3 / 50.2 / 25.1
166.1 / 166.1 / 83.1 / 41.5
or
166.1 / 124.5 / 83.1 / 41.5
G4 (96.01482)
200 / 200 / 66 / 33
150.6 / 150.6 / 50.2 / 25.1
249.2 / 249.2 / 83.1 / 41.5
Document #: 38-07262 Rev. *B
Page 15 of 21
W305B
Absolute Maximum DC Power Supply
Parameter
Description
Min.
Max.
Unit
VDDQ3
3.3V Core Supply Voltage
–0.5
4.6
V
VDDQ2
2.5V I/O Supply Voltage
–0.5
3.6
V
TS
Storage Temperature
–65
150
°C
Absolute Maximum DC I/O
Parameter
Description
Min.
Max.
Unit
Vi/o3
3.3V Core Supply Voltage
–0.5
4.6
V
Vi/o3
2.5V I/O Supply Voltage
–0.5
3.6
V
ESD prot.
Input ESD Protection
2000
V
DC Electrical Characteristics [2]
DC parameters must be sustainable under steady state (DC)
conditions.
DC Operating Requirements
Parameter
Description
Condition
Min.
Max.
Unit
VDD3
3.3V Core Supply Voltage
3.3V±5%
3.135
3.465
V
VDDQ3
3.3V I/O Supply Voltage
3.3V±5%
3.135
3.465
V
VDDQ2
2.5V I/O Supply Voltage
2.5V±5%
2.375
2.625
V
Vih3
3.3V Input High Voltage
VDD3
Vil3
3.3V Input Low Voltage
Iil
Input Leakage Current[3]
Voh2
Vol2
VDD3 = 3.3V±5%
2.0
VDD + 0.3
V
VSS – 0.3
0.8
V
0<Vin<VDD3
–5
+5
µA
2.5V Output High Voltage
Ioh=(–1 mA)
2.0
2.5V Output Low Voltage
Iol=(1 mA)
Voh3
3.3V Output High Voltage
Ioh=(–1 mA)
Vol3
3.3V Output Low Voltage
Iol=(1 mA)
VDDQ2 = 2.5V±5%
V
0.4
V
VDDQ3 = 3.3V±5%
2.4
V
0.4
V
VDDQ3 = 3.3V±5%
Vpoh3
PCI Bus Output High Voltage
Ioh=(–1 mA)
Vpol3
PCI Bus Output Low Voltage
Iol=(1 mA)
Cin
Input Pin Capacitance
Cxtal
Xtal Pin Capacitance
Cout
Output Pin Capacitance
Lpin
Pin Inductance
Ta
Ambient Temperature
2.4
13.5
No Airflow
V
0.55
V
5
pF
22.5
pF
6
pF
0
7
nH
0
70
°C
Notes:
2. Multiple Supplies: The voltage on any input or I/O pin cannot exceed the power pin during power-up. Power supply sequencing is NOT req
3. Input Leakage Current does not include inputs with pull-up or pull-down resistors.
Document #: 38-07262 Rev. *B
Page 16 of 21
W305B
AC Electrical Characteristics TA = 0°C to +70°C, VDDQ3 = 3.3V±5%, VDDQ2= 2.5V±5%fXTL = 14.31818 MHz[2]
66.6-MHz Host
Parameter
Description
100-MHz Host
133-MHz Host
Min.
Max.
Min.
Max.
Min.
Max.
Unit
15.0
15.5
10.0
10.5
7.5
8.0
ns
Notes
TPeriod
Host/CPUCLK Period
THIGH
Host/CPUCLK High Time
5.2
N/A
3.0
N/A
1.87
N/A
ns
4,7
TLOW
Host/CPUCLK Low Time
5.0
N/A
2.8
N/A
1.67
N/A
ns
5
TRISE
Host/CPUCLK Rise Time
0.4
1.6
0.4
1.6
0.4
1.6
ns
TFALL
Host/CPUCLK Fall Time
0.4
1.6
0.4
1.6
0.4
1.6
ns
TPeriod
SDRAM CLK Period
10.0
10.5
10.0
10.5
10.0
10.5
ns
4
THIGH
SDRAM CLK High Time
3.0
N/A
3.0
N/A
3.0
N/A
ns
4
TLOW
SDRAM CLK Low Time
2.8
N/A
2.8
N/A
2.8
N/A
ns
5
TRISE
SDRAM CLK Rise Time
0.4
1.6
0.4
1.6
0.4
1.6
ns
TFALL
SDRAM CLK Fall Time
0.4
1.6
0.4
1.6
0.4
1.6
ns
TPeriod
APIC CLK Period
60.0
64.0
60.0
N/A
60.0
64.0
ns
4
THIGH
APIC CLK High Time
25.5
N/A
25.5
N/A
25.5
N/A
ns
4
TLOW
APIC CLK Low Time
25.3
N/A
25.30
N/A
25.30
N/A
ns
5
TRISE
APIC CLK Rise Time
0.4
1.6
0.4
1.6
0.4
1.6
ns
TFALL
APIC CLK Fall Time
0.4
1.6
0.4
1.6
0.4
1.6
ns
TPeriod
3V66 CLK Period
15.0
16.0
15.0
16.0
15.0
16.0
ns
THIGH
3V66 CLK High Time
5.25
N/A
5.25
N/A
5.25
N/A
ns
4
TLOW
3V66 CLK Low Time
5.05
N/A
5.05
N/A
5.05
N/A
ns
5
TRISE
3V66 CLK Rise Time
0.5
2.0
0.5
2.0
0.5
2.0
ns
TFALL
3V66 CLK Fall Time
0.5
2.0
0.5
2.0
0.5
2.0
ns
TPeriod
PCI CLK Period
30.0
N/A
30.0
N/A
30.0
N/A
ns
THIGH
PCI CLK High Time
12.0
N/A
12.0
N/A
12.0
N/A
ns
4
TLOW
PCI CLK Low Time
12.0
N/A
12.0
N/A
12.0
N/A
ns
5
TRISE
PCI CLK Rise Time
0.5
2.0
0.5
2.0
0.5
2.0
ns
TFALL
PCI CLK Fall Time
0.5
2.0
0.5
2.0
0.5
2.0
ns
tpZL, tpZH
Output Enable Delay (All outputs)
1.0
10.0
1.0
10.0
1.0
10.0
ns
tpLZ, tpZH
Output Disable Delay
(All outputs)
1.0
10.0
1.0
10.0
1.0
10.0
ns
tstable
All Clock Stabilization from
Power-Up
3
ms
3
3
4
4, 5
4, 7
Notes:
4. Period, jitter, offset, and skew measured on rising edge at 1.25 for 2.5V clocks and at 1.5V for 3.3V clocks.
5. The time specified is measured from when VDDQ3 achieves its nominal operating level (typical condition VDDQ3 = 3.3V) until the frequency output is stable and
operating within specification.
6. TRISE and TFALL are measured as a transition through the threshold region Vol = 0.4V and Voh = 2.0V (1 mA) JEDEC specification.
7. TLOW is measured at 0.4V for all outputs.
8. THIGH is measured at 2.0V for 2.5V outputs, 2.4V for 3.3V outputs.
Document #: 38-07262 Rev. *B
Page 17 of 21
W305B
Group Skew and Jitter Limits
Output Group
Pin-Pin Skew Max.
Cycle-Cycle Jitter
Duty Cycle
Nom Vdd
Skew, Jitter
Measure Point
CPU
175 ps
250 ps
45/55
2.5V
1.25V
SDRAM
250 ps
250 ps
45/55
3.3V
1.5V
APIC
250 ps
500 ps
45/55
2.5V
1.25V
48MHz
250 ps
500 ps
45/55
3.3V
1.5V
3V66
175 ps
500 ps
45/55
3.3V
1.5V
PCI
500 ps
500 ps
45/55
3.3V
1.5V
REF
N/A
1000 ps
45/55
3.3V
1.5V
Output
Buffer
Test Point
Test Load
Clock Output Wave
TPERIOD
Duty Cycle
THIGH
2.0
2.5V Clocking
Interface
1.25
0.4
TLOW
TRISE
TFALL
TPERIOD
Duty Cycle
THIGH
2.4
3.3V Clocking
Interface
1.5
0.4
TLOW
TRISE
TFALL
Figure 6. Output Buffer
Ordering Information
Ordering Code
Package Type
Operating Range
W305BH
56-pin SSOP (300 mils)
Commercial
W305BHH
56-pin SSOP (300 mils) – Tape and Reel
Commercial
CYW305OXC
56-pin SSOP (300 mils)
Commercial
CYW305OXCT
56-pin SSOP (300 mils) – Tape and Reel
Commercial
Lead Free
Document #: 38-07262 Rev. *B
Page 18 of 21
W305B
Layout Example
+2.5V Supply
+3.3V Supply
FB
FB
VDDQ2
VDDQ3
C4
G
G
G
.005 mF
10 mF
G
G
1
2
3
4
5
6
7
8
9
10
+3.3V
5Ω
C5 G
10 µF
G C6
0.1 µF
G
G
V
V
G
G
V
G
V
G
G
G
11
12
13
14 G
15
16 G
17 V
18 G
19
20
21 G
22
23
24
25
26
27 G
28 V
V
G
W305B
G
C1
C3
G
V
G
G
V
G
G
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
10 mF
.005 mf
G
G
C2
G
G
G
G
G
FB = Dale ILB1206 - 300 (300Ω @ 100 MHz) or TDK ACB 2012L-120
Cermaic Cap C1, C3 & C5 = 10 - 22 µF
G = VIA to GND plane layer
C2 & C4 = .005 µF C6 = 0.1 µF
V =VIA to respective supply plane layer
Note: Each supply plane or strip should have a ferrite bead and capacitors
Document #: 38-07262 Rev. *B
Page 19 of 21
W305B
Package Drawing Dimension
56-Lead Shrunk Small Outline Package O56
.020
1
28
0.395
0.420
0.292
0.299
29
DIMENSIONS IN INCHES MIN.
MAX.
56
0.720
0.730
SEATING PLANE
0.088
0.092
0.095
0.110
0.005
0.010
.010
GAUGE PLANE
0.025
BSC
0.110
0.008
0.0135
0.008
0.016
0°-8°
0.024
0.040
51-85062-*C
All product and company names mentioned in this document are trademarks of their respective holders.
Document #: 38-07262 Rev. *B
Page 20 of 21
© Cypress Semiconductor Corporation, 2004. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be
used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its
products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
W305B
Document History Page
Document Title: W305B Frequency Controller with System Recovery for Intel Integrated Core Logic
Document Number: 38-07262
REV.
ECN NO.
Issue Date
Orig. of
Change
Description of Change
**
110527
12/02/01
SZV
Change from Spec number: 38-01099 to 38-07262
*A
122861
12/22/02
RBI
Added power up requirements to Recommended Operating Conditions
*B
260010
See ECN
RGL
Added Lead Free Devices
Document #: 38-07262 Rev. *B
Page 21 of 21