
9
Integrated
Circuit
Systems, Inc.
ICS952703
Preliminary Product Preview
0813B—05/17/05
I
2C Table: VCO Frequency Control Register
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
I
2C Table: VCO Frequency Control Register
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
I
2C Table: Spread Spectrum Control Register
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
I
2C Table: Spread Spectrum Control Register
Bit 7
Reserved
R
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
M Divider Programming
bits
PWD
Byte 11
Pin #
Name
-
Byte 12
Pin #
Name
-
Type
-
N Divider Programming
b(7:0)
-
Control Function
-
Byte 13
Pin #
-
PWD
-
Byte 14
Pin #
Name
Type
Control Function
-
Spread Spectrum
Programming b(14:8)
Spread Spectrum
Programming b(7:0)
Control Function
Type
Control Function
0
1
01
The decimal representation of M and N
Divier in Byte 11 and 12 will configure the
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]
01
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.
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 11 and 12 will configure the
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]
-