ICS9148-26 Datasheet, PDF (5/17 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for PENTIUM/ProTM

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
41
43
44
PWD
1
1
1
1
1
1
1
1
Description
(Reserved)
(Reserved)
(Reserved)
(Reserved)
SDRAM12 (Act/Inact)
SDRAM13 (Act/Inact)
CPUCLK1 (Act/Inact)
CPUCLK0 (Act/Inact)
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 #
-
7
-
14
12
11
10
8
PWD
1
1
1
1
1
1
1
1
Description
(Reserved)
PCICLK_F (Act/Inact)
(Reserved)
PCICLK4 (Act/Inact)
PCICLK3 (Act/Inact)
PCICLK2 (Act/Inact)
PCICLK1 (Act/Inact)
PCICLK0 (Act/Inact)
Notes:
1. Inactive means outputs are held LOW and are disabled from switching.
Byte 3: SDRAM 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
25
-
21,20,18,17
32,31,29,28
38,37,35,34
PWD
1
1
1
1
1
1
1
1
Description
(Reserved)
(Reserved)
48MHz (Act/Inact)
24 MHz (Act/Inact)
(Reserved)
SDRAM (8:11) (Active/Inactive)
(SDRAM 10, 11 only in Desktop Mode, MODE=1)
SDRAM (4:7) (Active/Inactive)
SDRAM (0:3) (Active/Inactive)
Notes:
1. Inactive means outputs are held LOW and are disabled from switching.
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ICS9148 - 26