ICS94215 Datasheet, PDF (8/18 Pages) Integrated Circuit Systems – Programmable System Clock Chip for AMD - K7™ Processor

ICS94215
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 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 9: Watchdog Timer Count Register
Bit PWD
Description
Bit 7 0
Bit 6 0 _{The decimal representation of these}
Bit 5 0 _{8 bits correspond to 290ms or 1ms}
Bit 4 0 the watchdog timer will wait before
Bit 3 0 it goes to alarm mode and reset the
Bit 2 0 ^{frequency to the safe setting. Default}
Bit 1 0 ^{at power up is 290ms.}
Bit 0 0
Byte 10: VCO Control Selection Bit
&
Wa_Btc_ih_t dog_PT_Wim_Der Control Re_Dg_eis_scte_rr_iption
Bit 7 0 0=Hw/B0 freq / 1=B11 & 12 freq
Bit 6 0 WD Enable 0=disable / 1=enable
Bit 5 0 WD Status 0=normal / 1=alarm
Bit 4 1 WD Safe Frequency, Byte 0 bit 2
Bit 3 0 WD Safe Frequency, FS3
Bit 2 0 WD Safe Frequency, FS2
Bit 1 0 WD Safe Frequency, FS1
Bit 0 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 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 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.
0442C—07/03/02
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