ICS94203 Datasheet, PDF (7/18 Pages) Integrated Circuit Systems – Programmable System Frequency Generator for PII/III™

ICS94203
Byte 7: Latch Inputs Readback Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
0 (Reserved)
0 (Reserved)
X (SEL24_48#)#
X FS4#
X FS3#
X FS2#
X FS1#
X FS0#
Byte 9: Watchdog Timer Count Register
Bit PWD
Description
Bit 7 0 _{The decimal representation of these}
Bit 6 0 8 bits correspond to 290ms the
Bit 5 0 ^{watchdog timer will wait before it}
Bit 4
Bit 3
0
1
goes to alarm mode and reset the
frequency to the safe setting. Default
at power up is 15 X 290ms = 4.4
Bit 2 1 _{seconds. Note, this timer does not}
Bit 1 1 control the RESET# signal (pin 30)
Bit 0 1 ^{in case of the frequency ratio change.}
Byte 11: Vender ID & Device ID Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
0
0
1
1
0
0
0
1
Device ID
Device ID
Device ID
Device ID
Vendor ID
Vendor ID
Vendor ID
Vendor ID
Description
Note: ICS Vendor ID is 0001 as in Number 1 in
frequency generation.
Notes:
1. PWD = Power on Default
Byte 8: 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=B14&15 freq
0 WD Enable 0=disable / 1=enable
0 WD Status 0=normal / 1=alarm
0 WD Safe Frequency, FS4
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 10: ICS Reserved Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
0 (Reserved)
0 (Reserved)
0 (Reserved)
0 (Reserved)
0 (Reserved)
0 (Reserved)
0 (Reserved)
0 (Reserved)
Note: This is an unused register. Writing to this register will
not affect device performance or functionality.
Byte 12: Revision ID Register
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PWD
Description
X Revision ID
X Revision ID
X Revision ID
X Revision ID
X Revision ID
X Revision ID
X Revision ID
X Revision ID
Note: Device ID and Revision ID values will be based on
individual device and its revision.
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