ICS952011 Datasheet, PDF (17/25 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for P4 processor

Integrated
Circuit
Systems, Inc.
ICS952011
I²C Table: Group Skew Control Register
Byte 18
Pin #
Name
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
CPUSkw1
CPUSkw0
SDSkw1
SDSkw0
Reserved
Reserved
Reserved
Reserved
Control
Function
CPU-CPU Skew Control
CPU-SD Skew Control
Reserved
Reserved
Reserved
Reserved
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
1
See Table 5: 4-Steps Skew
Programming Table
See Table 5: 4-Steps Skew
Programming Table
-
-
-
-
-
-
-
-
PWD
1
1
0
0
1
0
0
0
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
-
ZCLKSkw1
ZCLKSkw0
Reserved
Reserved
AGPSkw1
AGPSkw0
Reserved
Reserved
Control
Function
CPU-ZCLK Skew Control
Reserved
Reserved
CPU-AGP Skew Control
Reserved
Reserved
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
1
See Table 5: 4-Steps Skew
Programming Table
-
-
-
-
See Table 5: 4-Steps Skew
Programming Table
-
-
-
-
PWD
0
0
0
0
0
0
0
0
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
-
PCI_FSkw1
PCI_FSkw0
Reserved
Reserved
PCISkw1
PCISkw0
Reserved
Reserved
Control
Function
CPU-PCI_F Skew
Control
Reserved
Reserved
CPU-PCI Skew Control
Reserved
Reserved
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
1
See Table 5: 4-Steps Skew
Programming Table
-
-
-
-
See Table 5: 4-Steps Skew
Programming Table
-
-
-
-
PWD
0
0
0
0
0
0
0
0
Table 5: 4-Steps Skew Programming Table
4 Step
0
1
LSB
0
0ps
250ps
-
1
500ps
750ps
-
MSB
-
-
-
0721A—07/29/03
17