953002CFLF Datasheet, PDF (25/35 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for Next Gen P4 processor

Integrated
Circuit
Systems, Inc.
ICS953002
I²C Table: PLL1 Frequency Control Register
Byte 12
Pin #
Name
Control Function Type
0
1
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
N Div7
N Div6
N Div5
N Div4
N Div3
N Div2
N Div1
N Div0
RW
RW
RW
N Divider Programming ^RW
The decimal representation of M and N
Divier in Byte 11 and 12 will configure the
PLL1 VCO frequency. Default at power
b(7:0)
RW
up = latch-in or Byte 0 Rom table.
RW ^{VCO Frequency = 14.318 x [NDiv(9:0)+8]}
RW
/ [MDiv(5:0)+2]
RW
PWD
X
X
X
X
X
X
X
X
I²C Table: PLL1 Spread Spectrum Control Register
Byte 13
Pin #
Name
Control Function
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
SSP7
SSP6
SSP5
SSP4
SSP3
SSP2
SSP1
SSP0
Spread Spectrum
Programming b(7:0)
Type
0
1
RW
RW
RW
RW
These Spread Spectrum bits in Byte 13
and 14 will program the spread pecentage
RW
of PLL1
RW
RW
RW
PWD
X
X
X
X
X
X
X
X
I²C Table: PLL1 Spread Spectrum Control Register
Byte 14
Pin #
Name
Control Function
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
Reserved
SSP14
SSP13
SSP12
SSP11
SSP10
SSP9
SSP8
Reserved
Spread Spectrum
Programming b(14:8)
Type
0
1
R
-
-
RW
RW
RW These Spread Spectrum bits in Byte 13
RW ^{and 14 will program the spread pecentage}
RW
of PLL1
RW
RW
PWD
0
X
X
X
X
X
X
X
I²C Table: Output Divider Control Register
Byte 15
Pin #
Name
Control Function Type
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
CPUDiv3
CPUDiv2
CPUDiv1
CPUDiv0
AGP/PCIDiv3
AGP/PCIDiv2
AGP/PCIDiv1
AGP/PCIDiv0
RW
CPU Divider Ratio
RW
Programmaing Bits
RW
RW
RW
AGP/PCI Divider Ratio _RW
Programmaing Bits
PLL2
RW
RW
0
1
0000:/2
0001:/3
0010:/5
0011:/7
0000:/2
0001:/3
0010:/5
0011:/7
0100:/4 1000:/8
0101:/6 1001:/12
0110:/10 1010:/20
0111:/14 1011:/28
0100:/4 1000:/8
0101:/6 1001:/12
0110:/10 1010:/20
0111:/14 1011:/28
1100:/16
1101:/24
1110:/40
1111:/56
1100:/16
1101:/24
1110:/40
1111:/56
PWD
X
X
X
X
X
X
X
X
0924—11/18/09
25