ICS952621 Datasheet, PDF (9/15 Pages) Integrated Circuit Systems – Programmable Timing Control Hub™ for Next Gen P4™ processor

Integrated
Circuit
Systems, Inc.
ICS952621
I²C Table: Read-Back Register
Byte 0
Bit 7
Bit 6
Pin #
-
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
Name
Control Function
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
FSB
Freq Select 1 Read
Back
FSA
Freq Select 0 Read
Back
Type
-
-
-
R
R
R
R
R
0
1
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
READBACK of
CPU(2:0) Frequency
PWD
X
X
X
X
X
X
X
X
I²C Table: Spreading and Device Behavior Control Register
Byte 1
Bit 7
Bit 6
Pin #
Name
SRC/SRC#
SRC
Control Function
SRC Free-Running
Control
Output Control
Bit 5
RESERVED
Bit 4
RESERVED
Bit 3
RESERVED
Bit 2
RESERVED
Bit 1
CPUT1/CPUC1
Output Control
Bit 0
CPUT0/CPUC0
Output Enable
Type
RW
RW
R
R
R
R
RW
RW
0
1
FREE- STOPPAB
RUN
Disable
LE
Enable
RESERVED
RESERVED
RESERVED
RESERVED
Disable Enable
Disable Enable
PWD
0
1
X
X
X
X
1
1
I²C Table: Output Control Register
Byte 2
Pin #
Name
Bit 7
SRC_PD#
Drive Mode
Bit 6
SRC_Stop#
Drive Mode
Bit 5
RESERVED
Bit 4
CPUT1_PD# Drive Mode
Bit 3
CPUT0_PD# Drive Mode
Bit 2
RESERVED
Bit 1
RESERVED
Bit 0
RESERVED
Control Function
0: Driven in PD#
0: Driven in
PCI_Stop#
RESERVED
0:driven in PD#
1: Tri-stated
RESERVED
RESERVED
RESERVED
Type
RW
RW
-
RW
RW
-
-
-
0
1
Driven
Hi-Z
Driven
Hi-Z
RESERVED
Driven
Hi-Z
Driven
Hi-Z
RESERVED
RESERVED
RESERVED
PWD
0
0
X
0
0
X
X
X
I²C Table: Output Control Register
Byte 3
Pin #
Name
Bit 7
PCI_Stop#
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RESERVED
PCICLK5
PCICLK4
PCICLK3
PCICLK2
PCICLK1
PCICLK0
0756A—09/10/04
Control Function
PCI_Stop# Control
0:all stoppable PCI
are stopped
RESERVED
Output Control
Output Control
Output Control
Output Control
Output Control
Output Control
Type
RW
-
RW
RW
RW
RW
RW
RW
0
1
Enable Disable
RESERVED
Disable Enable
Disable Enable
Disable Enable
Disable Enable
Disable Enable
Disable Enable
PWD
1
X
1
1
1
1
1
1
9