ICS94229 Datasheet, PDF (7/17 Pages) Integrated Circuit Systems – Programmable System Clock Chip for AMD - K7 processor

ICS94229
Advance Information
Byte 1: CPU, Active/Inactive Register
(1= enable, 0 = disable)
BIT PIN# PWD
DESCRIPTION
Bit 7 42, 41 1 CPUCLKT0, CPUCLKC0
Bit 6 39, 38 1 CPUCLK_CST0, CPUCLK_CSC0
Bit 5 6
1 48MHz
Bit 4 7
1 24_48MHz
Bit 3 -
1 FS0 (readback)
Bit 2 28
1 AGP2
Bit 1 27
1 AGP1
Bit 0 26
1 AGP0
Byte 3: PCI, REF, Active/Inactive Register
(1= enable, 0 = disable)
BIT
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PIN#
9
22
-
21
46
-
47
48
PWD
DESCRIPTION
1 PCICLK_F
1 PCICLK9_E
1 FS1 (readback)
1 PCICLK8
1 REF_F
1 FS2 (readback)
1 REF1
1 REF0
Byte 5: Vendor Specific Feature, Active/Inactive Register
(1= enable, 0 = disable)
BIT
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PIN# PWD
DESCRIPTION
-
0 SEL24_48# (readback)
-
0 FS3 (readback)
-
0
Watchdog status:
0=Normal 1=Alarm
-
1 SSB1
-
1 FS3
-
1 FS2
-
1 FS1
-
0 FS0
Notes:
1. Inactive means outputs are held LOW and are disabled
from switching.
2. Watch dog timer is enabled or disabled via latch input
WDEN during power up. User can change watch dog
state with Byte 4 bit 7 after power up condition is
established.
Byte 2: PCI, Active/Inactive Register
(1= enable, 0 = disable)
BIT
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PIN#
20
18
17
16
14
13
11
10
PWD
DESCRIPTION
1 PCICLK7
1 PCICLK6
1 PCICLK5
1 PCICLK4
1 PCICLK3
1 PCICLK2
1 PCICLK1
1 PCICLK0
Byte 4: Watch Dog Register
(1= enable, 0 = disable)
BIT
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PIN#
-
-
-
-
-
-
-
-
PWD
DESCRIPTION
Watch dog enable
0 0: stop
1: start
0 M/N program enable
0 _{The decimal representation of}
0 _{these 8 bits correspond to 290ms}
0 ^{or 1ms the watchdog timer will}
wait before it goes to alarm mode
1 _{and reset the frequency to the safe}
0 ^{setting. Default at power up is 4X}
0 ^{580ms = 2.3 seconds.}
Byte 6: Vendor ID1 , Active/Inactive Register
(1= enable, 0 = disable)
BIT PIN# PWD
DESCRIPTION
Bit7 -
0
Bit6 -
Bit5 -
0
Device ID
0
Bit4 -
1
Bit3 -
0
Bit2 -
Bit1 -
0
Vendor ID
0
Bit0 -
1
Note: Don’t write into this register, writing into this
register can cause malfunction
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