IDTTM/ICSTM

Programmable System Clock Chip for ATI RS/RD690 K8TM - based Systems

1211B—09/17/09

ICS951464

IDTTM/ICSTM Programmable System Clock Chip for ATI RS/RD690 K8

TM - based Systems

4

General Description

Block Diagram

The ICS951464 is a main clock synthesizer chip that provides all clocks required for ATI RS/RD690-based

systems. An SMBus interface allows full control of the device.

Programmable

Spread

PLLs

Control

Logic

Xtal

Osc.

Fixed PLL

48MHz(1:0)

REF(2:0)

CPUCLK(2:0)

X1

X2

Programmable

Dividers

CLKREQA#

SMBDAT

SMBCLK

FS(2:0)

CLKREQB#

ATIGCLK(2:0)

SRCCLK(7:0)

CLKREQC#

RESET_IN#

HTTCLK0

951464 Power Group Table

VDD Pin#

GND Pin#

Description

2

1

Crsytal, REF VDD & VSS I/O & Core

5

8

48M Core and Output; FIX PLL Analog/Digital

14,26

15,27

SRC I/O & Core

23

22

SRC I/O & Core; SRC PLL Digital

36

37

SRC I/O & Core; SRC PLL Analog

33

32

ATIG I/O & Core; ATIG PLL Analog/Digital

42

41

CPU PLL Analog

46

45

CPU I/O & Core; CPU PLL Digital

52

50

HTT I/O & Core