
13
Integrated
Circuit
Systems, Inc.
ICS951462
1094J—03/16/09
SMBus Table: CPU PLL Spread Spectrum Control Register
Byte 13
Pin #
Name
Control Function
Type
0
1
PWD
Bit 7
-
SSP7
RW
X
Bit 6
-
SSP6
RW
X
Bit 5
-
SSP5
RW
X
Bit 4
-
SSP4
RW
X
Bit 3
-
SSP3
RW
X
Bit 2
-
SSP2
RW
X
Bit 1
-
SSP1
RW
X
Bit 0
-
SSP0
RW
X
SMBus Table: CPU PLL Spread Spectrum Control Register
Byte 14
Pin #
Name
Control Function
Type
0
1
PWD
Bit 7
0
Bit 6
-
SSP14
RW
X
Bit 5
-
SSP13
RW
X
Bit 4
-
SSP12
RW
X
Bit 3
-
SSP11
RW
X
Bit 2
-
SSP10
RW
X
Bit 1
-
SSP9
RW
X
Bit 0
-
SSP8
RW
X
SMBus Table: ATIG PLL VCO Frequency Control Register
Byte 15
Pin #
Name
Control Function
Type
0
1
PWD
Bit 7
-
N Div8
N Divider Prog bit 8
RW
X
Bit 6
-
N Div9
N Divider Prog bit 9
RW
X
Bit 5
-
M Div5
RW
X
Bit 4
-
M Div4
RW
X
Bit 3
-
M Div3
RW
X
Bit 2
-
M Div2
RW
X
Bit 1
-
M Div1
RW
X
Bit 0
-
M Div0
RW
X
SMBus Table: ATIG PLL VCO Frequency Control Register
Byte 16
Pin #
Name
Control Function
Type
0
1
PWD
Bit 7
-
N Div7
RW
X
Bit 6
-
N Div6
RW
X
Bit 5
-
N Div5
RW
X
Bit 4
-
N Div4
RW
X
Bit 3
-
N Div3
RW
X
Bit 2
-
N Div2
RW
X
Bit 1
-
N Div1
RW
X
Bit 0
-
N Div0
RW
X
SMBus Table: ATIG PLL Spread Spectrum Control Register
Byte 17
Pin #
Name
Control Function
Type
0
1
PWD
Bit 7
-
SSP7
RW
X
Bit 6
-
SSP6
RW
X
Bit 5
-
SSP5
RW
X
Bit 4
-
SSP4
RW
X
Bit 3
-
SSP3
RW
X
Bit 2
-
SSP2
RW
X
Bit 1
-
SSP1
RW
X
Bit 0
-
SSP0
RW
X
Spread Spectrum Programming
b(7:0)
Spread Spectrum Programming
b(14:8)
These Spread Spectrum bits
in Byte 13 and 14 will program
the spread pecentage. It is
recommended to use ICS
Spread % table for spread
programming.
The decimal representation of
M and N Divier in Byte 17 and
18 will configure the VCO
frequency. Default at power
up = Byte 0 Rom table. VCO
Frequency = 14.318 x
[NDiv(9:0)+8] / [MDiv(5:0)+2]
M Divider Programming bits
N Divider Programming b(7:0)
These Spread Spectrum bits
in Byte 13 and 14 will program
the spread pecentage. It is
recommended to use ICS
Spread % table for spread
programming.
Reserved
The decimal representation of
M and N Divier in Byte 17 and
18 will configure the VCO
frequency. Default at power
up = Byte 0 Rom table. VCO
Frequency = 14.318 x
[NDiv(9:0)+8] / [MDiv(5:0)+2]
Spread Spectrum Programming
b(7:0)
These Spread Spectrum bits
in Byte 19 and 20 will program
the spread pecentage. It is
recommended to use ICS
Spread % table for spread
programming.