ICS952802 datasheet(11/19 Pages) ICST

Part #	ICS952802

Description	Programmable Timing Control Hu for P4 processor

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Manufacturer	ICST [Integrated Circuit Systems]

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11

Integrated

Circuit

Systems, Inc.

ICS952802

Advance Information

0731—09/18/02

Table 3: 4-Steps Skew Programming Table

4 Step

0

1

LSB

0

0ps

250ps

-

1

500ps

750ps

-

MSB

--

-

Table 4: Asynchronous Frequency Selection Table

B18 bit2

B18 bit1

B18 bit0

VCO

ZCLK

AGP

PCI

0

Main PLL

0

1

528

Main PLL

66

33

0

1

0

528

Main PLL

75.4

37.7

0

1

528

Main PLL

88

44

1

0

528

132

Main PLL

1

0

1

528

132

66

33

1

0

528

132

75.4

37.7

1

528

132

88

44

I

2C Table: Group Skew Control Register

Control

Function

Bit 7

ZCLKSkw3

RW

0

Bit 6

ZCLKSkw2

RW

0

Bit 5

ZCLKSkw1

RW

1

Bit 4

ZCLKSkw0

RW

1

Bit 3

AGPSkw3

RW

0

Bit 2

AGPSkw2

RW

0

Bit 1

AGPSkw1

RW

1

Bit 0

AGPSkw0

RW

1

I

2C Table: Group Skew Control Register

Control

Function

Bit 7

PCISkw3

RW

0

Bit 6

PCISkw2

RW

0

Bit 5

PCISkw1

RW

0

Bit 4

PCISkw0

RW

0

Bit 3

Reserved

RW

-

0

Bit 2

Reserved

RW

-

0

Bit 1

Reserved

RW

-

0

Bit 0

Reserved

RW

-

0

1

CPU-AGP Skew

Control

16-Steps Skew Control.

This byte will advance or

delay the skew by 100ps

per step

Name

0

PWD

-

Type

CPU-ZCLK Skew

Control

16-Steps Skew Control.

This byte will advance or

delay the skew by 100ps

per step

-

Byte 19

Pin #

-

PWD

-

Byte 20

Pin #

Name

Type

CPU-PCI Skew Control

16-Steps Skew Control.

This byte will advance or

delay the skew by 100ps

per step

-

01

-

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