ICS950227 Datasheet, PDF (9/17 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for P4

Integrated
Circuit
Systems, Inc.
ICS950227
I²C Table: Output Divider Control Register
Byte 17
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pin #
-
-
-
-
-
-
-
-
Name
Reserved
Reserved
Reserved
CPUINV
Reserved
Reserved
Reserved
Reserved
Control Function
Reserved
Reserved
Reserved
CPU Phase Invert
Reserved
Reserved
Reserved
Reserved
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
-
-
-
Default
-
-
-
-
1
-
-
-
Inverse
-
-
-
-
PWD
0
0
0
0
0
0
0
0
I²C Table: Group Skew Control Register
Byte 18
Pin #
Name
Control Function
Type
0
Bit 7
-
Reserved
Reserved
RW
-
Bit 6
-
Reserved
Reserved
RW
-
Bit 5
-
Reserved
Reserved
RW
-
Bit 4
-
Reserved
Reserved
RW
-
Bit 3
-
CPUSkw1
CPUCLKT/C (2:0)
RW
-
Bit 2
-
CPUSkw0
Skew Control
RW
-
Bit 1
-
Reserved
Reserved
RW
-
Bit 0
-
Reserved
Reserved
RW
-
1
PWD
-
0
-
0
-
0
-
0
-
0
-
1
-
0
-
0
I²C Table: Group Skew Control Register
Byte 19
Pin #
Name
Bit 7
-
Reserved
Bit 6
-
Reserved
Bit 5
-
Reserved
Bit 4
-
Reserved
Bit 3
-
PCISkw3
Bit 2
-
PCISkw2
Bit 1
-
PCISkw1
Bit 0
-
PCISkw0
I²C Table: Slew Rate Control Register
Byte 20
Bit 7
Pin #
-
Name
3V66ISkw
Bit 6
-
3V66ISkw
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
Reserved
Reserved
RESERVED
RESERVED
RESERVED
RESERVED
Control Function
Reserved
Reserved
Reserved
Reserved
PCI (6:1) AND
PCIF(2:0) Skew
Control
Control Function
3V66 (5:0) Skew
Control
Reserved
Reserved
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
1
0
0
Type
RW
RW
RW
RW
-
-
-
-
0
1
Skew Control This byte
will advance or delay the
skew by 250 ps per step
-
-
-
-
-
-
-
-
-
-
-
-
PWD
0
1
0
0
0
0
0
0
0641D—07/03/03
9