4

ICS9LPRS464

System Clock Chip for ATI RS/RD600 series chipsets using AMD CPUss

IDTTM/ICSTM

System Clock Chip for ATI RS/RD600 series chipsets using AMD CPUs

1377A—04/07/08

General Description

The ICS9LPRS464 is a main clock synthesizer chip that provides all clocks required for ATI RD/RS600-based systems. An SMBus

interface allows full control of the device.

Funtional Block Diagram

CONTROL

LOGIC

XTAL

OSC.

FIXED PLL

48MHz(1:0)

REF(2:0)

SRCCLK(5:0)

X1

X2

PLL

CPU

DIV

PD

SMBDAT

SMBCLK

FS(2:0)

CLKREQB#

ATIG

DIV

ATIGCLK(1:0)

CPUCLK(1:0)

CLKREQC#

SRC

DIV

HTT

DIV

HTTCLK0

RESET_IN#

CLKREQA#