W305B Datasheet, PDF (9/21 Pages) Cypress Semiconductor – Frequency Controller with System Recovery for Intel Integrated Core Logic

W305B
Byte 6: Vendor ID & Revision ID Register (Read Only)
Bit
Bit 7
Bit 6
Name
Revision_ID3
Revision_ID2
Default
0
0
Revision ID bit[3]
Revision ID bit[2]
Pin Description
Bit 5
Bit 4
Bit 3
Revision_ID1
Revision_ID0
Vendor_ID3
0
Revision ID bit[1]
0
Revision ID bit[0]
1
Bit[3] of Cypress Semiconductor’s Vendor ID. This bit is read only.
Bit 2
Bit 1
Bit 0
Vendor_ID2
Vendor _ID1
Vendor _ID0
0
Bit[2] of Cypress Semiconductor’s Vendor ID. This bit is read only.
0
Bit[1] of Cypress Semiconductor’s Vendor ID. This bit is read only.
0
Bit[0] of Cypress Semiconductor’s Vendor ID. This bit is read only.
Byte 7: Control Register 7
Bit
Pin#
Bit 7
-
Bit 6
24
Bit 5
23
Bit 4
22
Bit 3
24
Bit 2
23
Bit 1
22
Bit 0
--
Name
Reserved
24_48MHz_DRV
48MHz_DRV
48MHz_DRV
24_48MHz
48 MHz
48 MHz
Reserved
Default
0
1
1
1
1
1
1
0
Pin Description
Reserved
0 = Norm, 1 = High Drive
0 = Norm, 1 = High Drive
0 = Norm, 1 = High Drive
(Active/Inactive)
(Active/Inactive)
(Active/Inactive)
Reserved
Byte 8: Watchdog Timer Register
Bit
Bit 7
Bit 6
Name
PCI_Skew1
PCI_Skew0
Default
0
0
PCI skew control
00 = Normal
01 = –500ps
10 = Reserved
11 = +500ps
Pin Description
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
WD_TIMER4
WD_TIMER3
WD_TIMER2
WD_TIMER1
WD_TIMER0
1
These bits store the time-out value of the Watchdog timer. The scale of the
1
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
1
to 150 ms. If the pre-scaler is set to 2.5 sec, it can support a value from 2.5
1
sec. to 80 sec.
When the Watchdog timer reaches “0”, it will set the WD_TO_STATUS bit.
1
WD_PRE_SCALER
0
0 = 150 ms
1 = 2.5 sec
Byte 9: System RESET and Watchdog Timer Register
Bit
Bit 7
Bit 6
Bit 5
Name
SDRAM_DRV
PCI_DRV
FS_Override
Default
0
0
0
Pin Description
SDRAM clock output drive strength
0 = Normal
1 = High Drive
PCI clock output drive strength
0 = Normal
1 = High Drive
0 = Select operating frequency by FS[4:0] input pins
1 = Select operating frequency by SEL[4:0] settings
Document #: 38-07262 Rev. *B
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