ICS952906A Datasheet, PDF (12/23 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for Next Gen P4™ processor

Integrated
Circuit
Systems, Inc.
ICS952906A
I²C Table: VCO Frequency Control Register
Byte 11
Pin #
Name
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
N Div8
M Div6
M Div5
M Div4
M Div3
M Div2
M Div1
M Div0
Control
Function
N Divider Prog bit 8
M Divider
Programming bits
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
1
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(8:0)+8] /
[MDiv(6:0)+2]
PWD
X
X
X
X
X
X
X
X
I²C Table: VCO Frequency Control Register
Byte 12
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pin #
-
-
-
-
-
-
-
-
Name
N Div7
N Div6
N Div5
N Div4
N Div3
N Div2
N Div1
N Div0
Control
Function
N Divider
Programming b(8:0)
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
1
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(8:0)+8] /
[MDiv(6:0)+2]
PWD
X
X
X
X
X
X
X
X
I²C Table: Spread Spectrum Control Register
Byte 13
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pin #
-
-
-
-
-
-
-
-
Name
SSP7
SSP6
SSP5
SSP4
SSP3
SSP2
SSP1
SSP0
Control
Function
Spread Spectrum
Programming b(7:0)
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
1
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.
PWD
X
X
X
X
X
X
X
X
I²C Table: Spread Spectrum Control Register
Byte 14
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pin #
-
-
-
-
-
-
-
-
Name
Reserved
Reserved
SSP13
SSP12
SSP11
SSP10
SSP9
SSP8
Control
Function
Reserved
Reserved
Spread Spectrum
Programming b(13:8)
Type
R
R
RW
RW
RW
RW
RW
RW
0
1
-
-
-
-
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.
PWD
0
0
X
X
X
X
X
X
1236A—08/06/07
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