4

Integrated

Circuit

Systems, Inc.

ICS951413

0929C—03/07/05

ICS951413 provides a single-chip clocking solution for the ATI RS400-based systems using the latest Intel P4 processors.

ICS951413 is driven with a 14.318MHz crystal. It generates CPU outputs up to 400MHz and also provides highly accurate

SRC clocks for PCI-Express support. Two Clock Request pins are provided for Express-Card

outputs (ATIGCLK(1:0)) are frequency programmable.

General Description

Block Diagram

Power Groups

VDD

GND

56

55

Xtal, REF

51

49

PCICLK output

45

44

CPUCLK Outputs

14, 21, 35 15, 20, 26, 36

SRCCLK outputs

32

31

ATIGCLK outputs

39

38

Analog, CPU PLL

3

5

USB_48MHz output

Pin Number

Description

CPU PLL

PCICLK0

CONTROL

LOGIC

XTAL

OSC.

CPUCLK(2:0)

FIXED PLL

USB_48MHz

SRC

DIV2

/8/7/6/5

REF(2:0)

ATIGCLK(1:0)

X1

X2

PCI33

DIV

SRC PLL

CPU

DIV

CLKREQA#

SDATA

SCLK

FS_(C:A)

CLKREQB#

SRC

DIV1

SRCCLK(7:3,0)

CPU_STOP#

VTT_PWRGD#/PD

IREF

CK410#