ICS9148-37 Просмотр технического описания (PDF) - Integrated Circuit Systems
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ICS9148-37 Datasheet PDF : 16 Pages
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Serial Configuration Command Bitmap
Byte0: Functionality and Frequency Select Register
(default = 0)
Bit
Description
Bit 7
0 - ±0.25% Spread Spectrum Modulation
1 - ±0.6% Spread Spectrum Modulation
Bit6 Bit5 CPU Clock PCI AGP
Bit4
111
100
33.3 66.6
110
95.25
31.75 63.5
Bit
101
83.3
33.3 66.6
6:4
100
75
30
60
011
75
37.5
75
010
68.5
34.25 68.5
001
66.8
33.4 66.8
000
60
30
60
0 - Frequency is selected by hardware select,
Bit 3 Latched Inputs
1 - Frequency is selected by Bit 6:4 (above)
0 - Spread Spectrum center spread type.
1 - Spread Spectrum down spread type.
Bit 1
0 - Normal
1 - Spread Spectrum Enabled
Bit 0
0 - Running
1- Tristate all outputs
PWD
0
Note
1
0
0
0
0
ICS9148 - 37
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)
CPUCLK3 (Act/Inact)
CPUCLK2 (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
15
13
12
11
10
8
PWD
1
1
1
1
1
1
1
1
Description
(Reserved)
PCICLK_F (Act/Inact)
AGP0 (Act/Inact)
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.
5
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