ICS9248-171 Datasheet, PDF (5/15 Pages) Integrated Circuit Systems – AMD - K7TM System Clock Chip

ICS9248-171
Advance Information
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#
-
10
9
22
43
7
47, 46
45
PWD
DESCRIPTION
X FS3#
1 AGP1
1 AGP0
1 48MHz
1 SDRAM0
1
REF0 - 1X or 2X
default = 1=1X
1 CPUCLKT0, CPUCLKC0
1 CPUCLKT1
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#
-
-
-
31
30
27
26
25
PWD
DESCRIPTION
X FS0#
X FS1#
X FS2#
1 SDRAM8
1 SDRAM9
1 SDRAM10
1 SDRAM11
1 SDRAM12
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
19
18
15
14
13
12
PWD
X
1
1
1
1
1
1
1
DESCRIPTION
MODE#
PCICLK5
PCICLK4
PCICLK3
PCICLK2
PCICLK1
PCICLK0
PCICLK_F
Byte 4: Reserved , 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#
-
-
39
38
37
36
33
32
PWD
0
1
1
1
1
1
1
1
DESCRIPTION
Bit (7:6) = 01 DG_STOP# will
stop SDRAM & AGP clocks Bit
(7:6) = 10 DG_STOP# will stop
SDRAM clocks only Bit (7:6) =
11 DG_STOP# will stop AGP
clocks only
SDRAM2
SDRAM3
SDRAM4
SDRAM5
SDRAM6
SDRAM7
Byte 5: Peripheral , 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#
-
-
-
-
-
-
-
42
PWD
1
1
1
1
1
1
1
1
DESCRIPTION
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
SDRAM1
Notes:
1. Inactive means outputs are held LOW and are disabled
from switching.
2. Latched Frequency Selects (FS#) will be inverted logic
load of the input frequency select pin conditions.
Byte 6: Peripheral , Active/Inactive Register
(1= enable, 0 = disable)
BIT PIN# PWD
DESCRIPTION
Bit7 -
0 Reserved (Note)
Bit6 -
0 Reserved (Note)
Bit5 -
0 Reserved (Note)
Bit4 -
0 Reserved (Note)
Bit3 -
0 Reserved (Note)
Bit2 -
1 Reserved (Note)
Bit1 -
1 Reserved (Note)
Bit0 -
1 Reserved (Note)
Note: Don’t write into this register, writing into this
register can cause malfunction
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