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ICS951416

0937H—05/26/05

General Description

The ICS951416 is a main clock synthesizer chip that provides all clocks required for ATI RS480-based systems.

An SMBus interface allows full control of the device.

Block Diagram

CPU PLL

PCICLK0

CONTROL

LOGIC

XTAL

OSC.

CPUCLK8(1:0)

FIXED PLL

USB_48MHz

SRC

DIV2

/8/7/6/5

REF(2:0)

HTTCLK0

ATIGCLK(1:0)

X1

X2

PCI33

DIV

HTT66

DIV

SRC PLL

CPU

DIV

CLKREQA#

SDATA

SCLK

FS(2:0)

CLKREQB#

SRC

DIV1

SRCCLK(7:3,0)