ICS950104 Datasheet, PDF (8/19 Pages) Integrated Circuit Systems – Programmable System Clock Chip for PIII Processor

ICS950104
Advance Information
Byte 7: Vendor ID and Revision ID Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
0 Vendor ID
0 Vendor ID
1 Vendor ID
X Revision ID
X Revision ID
X Revision ID
X Revision ID
X Revision ID
Byte 9: Watchdog Timer Count Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
0
0 The decimal representation of these
0 ^{8 bits correspond to how many}
1
0
290ms the watchdog timer will wait
before it goes to alarm mode and
reset the frequency to the safe
0 _{setting. Default at power up is}
0 16X 290ms = 4.64 seconds.
0
Byte 11: VCO Frequency Control Register
Bit PWD
Description
Bit 7 X VCO Divider Bit0
Bit 6 X REF Divider Bit6
Bit 5 X REF Divider Bit5
Bit 4 X REF Divider Bit4
Bit 3 X REF Divider Bit3
Bit 2 X REF Divider Bit2
Bit 1 X REF Divider Bit1
Bit 0 X REF Divider Bit0
Note: The decimal representation of these 7 bits
(Byte 11 (6:0)) + 2 is equal to the REF divider value .
Notes:
1. PWD = Power on Default
Byte 8: Byte Count and Read Back Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
0 Reserved
0 Reserved
0 Reserved
0 Reserved
1 Reserved
0 Reserved
0 Reserved
0 Reserved
Description
Byte 10: VCO Control Selection Bit &
Watchdog Timer Control Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
0 0=Hw/B0 freq / 1=B11 & 12 freq
0 WD Enable 0=disable / 1=enable
0 WD Status 0=normal / 1=alarm
0 WD Safe Frequency, Byte 0 bit 2
0 WD Safe Frequency, FS3
0 WD Safe Frequency, FS2
0 WD Safe Frequency, FS1
0 WD Safe Frequency, FS0
Note: FS values in bit (0:4) will correspond to Byte 0 FS
values. Default safe frequency is same as 00000 entry in
byte0.
Byte 12: VCO Frequency Control Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
X VCO Divider Bit8
X VCO Divider Bit7
X VCO Divider Bit6
X VCO Divider Bit5
X VCO Divider Bit4
X VCO Divider Bit3
X VCO Divider Bit2
X VCO Divider Bit1
Note: The decimal representation of these 9 bits (Byte 12
bit (7:0) & Byte 11 bit (7) ) + 8 is equal to the VCO divider
value. For example if VCO divider value of 36 is desired,
user need to program 36 - 8 = 28, namely, 0, 00011100 into
byte 12 bit & byte 11 bit 7.
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