ICS952801 Datasheet, PDF (12/22 Pages) Integrated Circuit Systems – Programmable Timing Control HubTM for K8TM processor

Integrated
Circuit
Systems, Inc.
I²C Table: VCO Frequency Control Register
Byte 11
Pin #
Name
Control
Function
Bit 7
-
N Div8
N Divider Bit 8
Bit 6
-
M Div6
The decimal
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
M Div5
M Div4
M Div3
M Div2
M Div1
M Div0
representation of M Div
(6:0) + 2 is equal to
reference divider value.
Default at power up =
latch-in or Byte 0 Rom
table.
Type
RW
RW
RW
RW
RW
RW
RW
RW
ICS952801
Advance Information
0
1
PWD
-
-
X
-
-
X
-
-
X
-
-
X
-
-
X
-
-
X
-
-
X
-
-
X
I²C Table: VCO Frequency Control Register
Byte 12
Pin #
Name
Control
Function
Type
0
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
N Div7
RW
-
N Div6
The decimal
RW
-
N Div5
representation of N Div
RW
-
N Div4
(8:0) + 8 is equal to
RW
-
N Div3
VCO divider value.
Default at power up =
RW
-
N Div2
latch-in or Byte 0 Rom
RW
-
N Div1
table.
RW
-
N Div0
RW
-
1
PWD
-
X
-
X
-
X
-
X
-
X
-
X
-
X
-
X
I²C Table: Spread Spectrum Control Register
Byte 13
Pin #
Name
Control
Function
Type
0
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
SSP7
RW
-
SSP6
These Spread
RW
-
SSP5
Spectrum bits will
RW
-
SSP4
program the spread
pecentage. It is
RW
-
SSP3
recommended to use
RW
-
SSP2
ICS Spread % table for
RW
-
SSP1
spread programming.
RW
-
SSP0
RW
-
I²C Table: Spread Spectrum Control Register
Byte 14
Bit 7
Pin #
-
Name
Reserved
Control
Function
Reserved
Type
0
R
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Reserved
Reserved
R
-
SSP13
RW
-
SSP12
It is recommended to
RW
-
SSP11
use ICS Spread %
RW
-
SSP10
table for spread
RW
-
SSP9
programming.
RW
-
Bit 0
-
SSP8
RW
-
0719—01/22/03
12
1
PWD
-
X
-
X
-
X
-
X
-
X
-
X
-
X
-
X
1
PWD
-
0
-
0
-
X
-
X
-
X
-
X
-
X
-
X