ICS952906A Datasheet, PDF (14/23 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for Next Gen P4™ processor

Integrated
Circuit
Systems, Inc.
ICS952906A
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
-
3V66Skw3
3V66Skw2
3V66Skw1
3V66Skw0
PCISkw3
PCISkw2
PCISkw1
PCISkw0
Control
Function
CPU-3V66 7 Step
Skew Control (ps)
CPU-PCI 7 Step Skew
Control (ps)
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
1
0000:0 0100:150 1000:300 1100:450
0001:N/A 0101:N/A 1001:N/A 1101:600
0010:N/A 0110:N/A 1010:N/A 1110:750
0011:N/A 0111:N/A 1011:N/A 1111:900
0000:0 0100:150 1000:300 1100:450
0001:N/A 0101:N/A 1001:N/A 1101:600
0010:N/A 0110:N/A 1010:N/A 1110:750
0011:N/A 0111:N/A 1011:N/A 1111:900
PWD
0
0
0
0
1
1
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
-
PCISkw3
PCISkw2
PCISkw1
PCISkw0
Reserved
Reserved
Reserved
Reserved
Control
Function
CPU-PCI F(2:0) 7 Step
Skew Control (ps)
Reserved
Reserved
Reserved
Reserved
Type
RW
RW
RW
RW
RW
RW
RW
RW
0
1
0000:0 0100:150 1000:300 1100:450
0001:N/A 0101:N/A 1001:N/A 1101:600
0010:N/A 0110:N/A 1010:N/A 1110:750
0011:N/A 0111:N/A 1011:N/A 1111:900
-
-
-
-
-
-
-
-
PWD
1
1
0
0
0
0
0
0
I²C Table: Slew Rate Control Register
Byte 21
Pin #
Name
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
PCIFStr1
PCIFStr0
PCIFStr1
PCIFStr0
Reserved
Reserved
AGPStr1
AGPStr0
Control
Function
PCICLKF (2:0)
Strength Control
PCICLK (6) Strength
Control
Reserved
Reserved
AGPCLK Strength
Control
Type
RW
RW
RW
RW
RW
RW
0
00 = 0.63X
01 = 0.75X
00 = 0.63X
01 = 0.75X
-
-
00 = 0.70X
01 = 0.80X
1
10 = 0.88X
11 = 1.00X
10 = 0.88X
11 = 1.00X
-
-
10 = 0.90X
11 = 1.00X
PWD
1
1
1
1
1
1
1
1
I²C Table: Slew Rate Control Register
Byte 22
Pin #
Name
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
-
Bit 1
-
Bit 0
-
REF_Slw
PCIFStr1
PCIFStr0
PCIFStr1
PCIFStr0
PCIFStr1
PCIFStr0
Control
Function
REF Slew Rate Control
PCICLK (5) Strength
Control
PCICLK (4:2) Strength
Control
PCICLK (1:0) Strength
Control
Type
RW
RW
RW
RW
RW
0
00 = Medium
01 = Weak
00 = 0.63X
01 = 0.75X
00 = 0.63X
01 = 0.75X
00 = 0.63X
01 = 0.75X
1
10 = Strong
11 = N/A
10 = 0.88X
11 = 1.00X
10 = 0.88X
11 = 1.00X
10 = 0.88X
11 = 1.00X
PWD
1
0
1
1
1
1
1
1
1236A—08/06/07
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