ICS9248-134 Datasheet, PDF (4/13 Pages) Integrated Circuit Systems – Frequency Timing Generator for PENTIUM II/III Systems

ICS9248-134
Byte 1: CPU, 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 #
40
38
37
42
47
46
44
-
PWD
1
1
1
1
1
1
1
X
Description
CPUCLK 0
CPUCLK 1
CPUCLK 2
CPU/2
IOAPIC0
IOAPIC1
IOAPIC2
(Reserved)
Notes:
1. Inactive means outputs are held LOW and are disabled
from switching.
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 #
18
17
15
14
12
11
9
8
PWD
1
1
1
1
1
1
1
1
Description
PCICLK7
PCICLK6
PCICLK5
PCICLK4
PCICLK3
PCICLK2
PCICLK1
PCICLK_F
Notes:
1. Inactive means outputs are held LOW and are disabled
from switching.
Byte 3: 3V66 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 #
34
33
32
-
3
2
-
-
PWD
1
1
1
X
1
1
X
X
Description
3V66_0
3V66_1
3V66_2
FS1#
REF1
REF0
FS3#
FS2#
Notes:
1. Inactive means outputs are held LOW and are disabled
from switching.
Byte 4: 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 #
26
27
-
-
22
21
20
-
PWD
1
1
X
1
1
1
1
X
Description
24_48MHz
48MHz
FS0#
(Reserved)
PCICLK10
PCICLK9
PCICLK8
FS4#
Notes:
1. Inactive means outputs are held LOW and are disabled
from switching.
Byte 5: Active/Inactive Register
(1= enable, 0 = disable)
Bit
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Pin #
-
-
-
-
-
-
-
-
PWD
1
1
1
1
1
1
1
1
Description
Reserved (Note)
Reserved (Note)
Reserved (Note)
Reserved (Note)
Reserved (Note)
Reserved (Note)
Reserved (Note)
Reserved (Note)
Notes:
1. Inactive means outputs are held LOW and are disabled
from switching.
Byte6: Active/Inactive Register
(1= enable, 0 = disable)
Bit
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Pin #
-
-
-
-
-
-
-
-
PWD
0
0
0
0
0
1
1
0
Description
Reserved (Note)
Reserved (Note)
Reserved (Note)
Reserved (Note)
Reserved (Note)
Reserved (Note)
Reserved (Note)
Reserved (Note)
Note: Don’t write into this register, writing into this register
can cause malfunction
4