ICS952802 Datasheet, PDF (11/19 Pages) Integrated Circuit Systems – Programmable Timing Control Hu for P4 processor

Integrated
Circuit
Systems, Inc.
ICS952802
Advance Information
Table 3: 4-Steps Skew Programming Table
4 Step
0
1
MSB
0
0ps
500ps
-
1
250ps
750ps
-
LSB
-
-
-
Table 4: Asynchronous Frequency Selection Table
B18 bit2 B18 bit1 B18 bit0
VCO
ZCLK
0
0
0
Main PLL Main PLL
0
0
1
528
Main PLL
0
1
0
528
Main PLL
0
1
1
528
Main PLL
1
0
0
528
132
1
0
1
528
132
1
1
0
528
132
1
1
1
528
132
AGP
Main PLL
66
75.4
88
Main PLL
66
75.4
88
PCI
Main PLL
33
37.7
44
Main PLL
33
37.7
44
I²C Table: Group Skew Control Register
Byte 19
Pin #
Name
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
ZCLKSkw3
ZCLKSkw2
ZCLKSkw1
ZCLKSkw0
AGPSkw3
AGPSkw2
AGPSkw1
AGPSkw0
Control
Function
CPU-ZCLK Skew
Control
CPU-AGP Skew
Control
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
1
16-Steps Skew Control.
This byte will advance or
delay the skew by 100ps
per step
16-Steps Skew Control.
This byte will advance or
delay the skew by 100ps
per step
PWD
0
0
1
1
0
0
1
1
I²C Table: Group Skew Control Register
Byte 20
Pin #
Name
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
PCISkw3
PCISkw2
PCISkw1
PCISkw0
Reserved
Reserved
Reserved
Reserved
Control
Function
CPU-PCI Skew Control
Reserved
Reserved
Reserved
Reserved
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
1
16-Steps Skew Control.
This byte will advance or
delay the skew by 100ps
per step
-
-
-
-
-
-
-
-
PWD
0
0
0
0
0
0
0
0
0731—09/18/02
11