15
Integrated
Circuit
Systems, Inc.
ICS932S431A
Datasheet
1426A—11/12/09
SMBus Table: CPU Frequency Control Register
Pin # Name Control Function Type 0 1 PWD
Bit 7
CPU N Div8 N Divider Prog bit 8 RW X
Bit 6
CPU N Div9 N Divider Prog bit 9 RW X
Bit 5
CPU M Div5 RW X
Bit 4
CPU M Div4 RW X
Bit 3
CPU M Div3 RW X
Bit 2
CPU M Div2 RW X
Bit 1
CPU M Div1 RW X
Bit 0
CPU M Div0 RW X
SMBus Table: CPU Frequency Control Register
Pin # Name Control Function Type 0 1 PWD
Bit 7
CPU N Div7 RW X
Bit 6
CPU N Div6 RW X
Bit 5
CPU N Div5 RW X
Bit 4
CPU N Div4 RW X
Bit 3
CPU N Div3 RW X
Bit 2
CPU N Div2 RW X
Bit 1
CPU N Div1 RW X
Bit 0
CPU N Div0 RW X
SMBus Table: CPU Spread Spectrum Control Register
Byte 13 Pin # Name Control Function Type 0 1 PWD
Bit 7
CPU SSP7 RW X
Bit 6
CPU SSP6 RW X
Bit 5
CPU SSP5 RW X
Bit 4
CPU SSP4 RW X
Bit 3
CPU SSP3 RW X
Bit 2
CPU SSP2 RW X
Bit 1
CPU SSP1 RW X
Bit 0
CPU SSP0 RW X
SMBus Table: CPU Spread Spectrum Control Register
Pin # Name Control Function Type 0 1 PWD
Bit 7
0
Bit 6
CPU SSP14 RW X
Bit 5
CPU SSP13 RW X
Bit 4
CPU SSP12 RW X
Bit 3
CPU SSP11 RW X
Bit 2
CPU SSP10 RW X
Bit 1
CPU SSP9 RW X
Bit 0
CPU SSP8 RW X
The decimal representation of
M and N Divider in Byte 11 and
12 will configure the CPU VCO
frequency. Default at power up
= latch-in or Byte 0 Rom table.
VCO Frequency = 14.318 x
[NDiv(9:0)+8] / [MDiv(5:0)+2]
M Divider Programming
bit (5:0)
These Spread Spectrum bits in
Byte 13 and 14 will program the
spread pecentage of CPU
The decimal representation of
M and N Divider in Byte 11 and
12 will configure the CPU VCO
frequency. Default at power up
= latch-in or Byte 0 Rom table.
VCO Frequency = 14.318 x
[NDiv(9:0)+8] / [MDiv(5:0)+2]
Spread Spectrum
Programming bit(7:0)
N Divider Programming
Byte12 bit(7:0) and
Byte11 bit(7:6)
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Byte 12
Byte 14
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Spread Spectrum
Programming bit(14:8)
Reserved
These Spread Spectrum bits in
Byte 13 and 14 will program the
spread pecentage of CPU
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Byte 11
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