
16
Integrated
Circuit
Systems, Inc.
ICS932S431A
Datasheet
1426A—11/12/09
SMBus Table: SRC/PCI Frequency Control Register
Pin #
Name
Control Function
Type
0
1
PWD
Bit 7
SRC N Div8
N Divider Prog bit 8
RW
X
Bit 6
SRC N Div9
N Divider Prog bit 9
RW
X
Bit 5
SRC M Div5
RW
X
Bit 4
SRC M Div4
RW
X
Bit 3
SRC M Div3
RW
X
Bit 2
SRC M Div2
RW
X
Bit 1
SRC M Div1
RW
X
Bit 0
SRC M Div0
RW
X
SMBus Table: SRC/PCI Frequency Control Register
Pin #
Name
Control Function
Type
0
1
PWD
Bit 7
SRC N Div7
RW
X
Bit 6
SRC N Div6
RW
X
Bit 5
SRC N Div5
RW
X
Bit 4
SRC N Div4
RW
X
Bit 3
SRC N Div3
RW
X
Bit 2
SRC N Div2
RW
X
Bit 1
SRC N Div1
RW
X
Bit 0
SRC N Div0
RW
X
SMBus Table: SRC/PCI Spread Spectrum Control Register
Pin #
Name
Control Function
Type
0
1
PWD
Bit 7
X
Bit 6
X
Bit 5
X
Bit 4
X
Bit 3
X
Bit 2
X
Bit 1
X
Bit 0
X
SMBus Table: SRC/PCI Spread Spectrum Control Register
Pin #
Name
Control Function
Type
0
1
PWD
Bit 7
X
Bit 6
X
Bit 5
X
Bit 4
X
Bit 3
X
Bit 2
X
Bit 1
X
Bit 0
X
RESERVED
Byte 18
Byte 16
-
RESERVED
The decimal representation of
M and N Divider in Byte 15 and
16 will configure the SRC 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
bits
RESERVED
-
Byte 17
-
N Divider Programming
b(7:0)
The decimal representation of
M and N Divider in Byte 15 and
16 will configure the SRC 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]
-
Byte 15