3

ICS9LPRS464

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

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

1377A—04/07/08

Pin Description (Continued)

PIN #

PIN NAME

TYPE

DESCRIPTION

29

*CLKREQC#

IN

Programmable Clock Request pin for SRC/ATIG/SB_SRC outputs. If output is

selected for control, then that output is controlled as follows:

0 = Enabled, 1 = Tri-state

30

ATIG1C_LPR

OUT

Complementary clock of low-power differential push-pull PCI-Express pair with

integrated 33 ohm series resistor. (no 50ohm shunt resistor to GND needed)

31

ATIG1T_LPR

OUT

True clock of low-power differential push-pull PCI-Express pair with integrated

33 ohm series resistor. (no 50ohm shunt resistor to GND needed)

32

GNDATIG

GND

Ground pin for the ATIG outputs

33

VDDATIG

PWR

Power supply for ATIG core, nominal 3.3V

34

ATIG0C_LPR

OUT

Complementary clock of low-power differential push-pull PCI-Express pair with

integrated 33 ohm series resistor. (no 50ohm shunt resistor to GND needed)

35

ATIG0T_LPR

OUT

True clock of low-power differential push-pull PCI-Express pair with integrated

33 ohm series resistor. (no 50ohm shunt resistor to GND needed)

36

VDDSRC

PWR

Supply for SRC, 3.3V nominal

37

GNDSRC

GND

Ground pin for the SRC outputs

38

SRC0C_LPR

OUT

Complement clock of low power differential SRC clock pair with integrated 33

ohm series resistor. (no 50ohm shunt resistor to GND needed)

39

SRC0T_LPR

OUT

True clock of low power differential SRC clock pair with integrated 33 ohm series

resistor. (no 50ohm shunt resistor to GND needed)

40

NC

NC

No Connect

41

GNDA

GND

Ground for the Analog Core

42

VDDA

PWR

3.3V Power for the Analog Core

43

CPUKG1C_LPR

OUT

Complementary signal of low-power differential push-pull AMD K8 "Greyhound"

clock with integrated 33 ohm series resistor. (no 50ohm shunt resistor to GND

needed)

44

CPUKG1T_LPR

OUT

True signal of low-power differential push-pull AMD K8 "Greyhound" clock with

integrated 33 ohm series resistor. (no 50ohm shunt resistor to GND needed)

45

GNDCPU

GND

Ground pin for the CPU outputs

46

VDDCPU

PWR

Supply for CPU, 3.3V nominal

47

CPUKG0C_LPR

OUT

Complementary signal of low-power differential push-pull AMD K8 "Greyhound"

clock with integrated 33 ohm series resistor. (no 50ohm shunt resistor to GND

needed)

48

CPUKG0T_LPR

OUT

True signal of low-power differential push-pull AMD K8 "Greyhound" clock with

integrated 33 ohm series resistor. (no 50ohm shunt resistor to GND needed)

49

*CLKREQA#

IN

Programmable Clock Request pin for SRC/ATIG/SB_SRC outputs. If output is

selected for control, then that output is controlled as follows:

0 = Enabled, 1 = Tri-state

50

GNDHTT

PWR

Ground pin for the HTT outputs

51

HTTCLK0

OUT

3.3V single ended 66MHz hyper transport clock

52

VDDHTT

PWR

Supply for HTT clocks, nominal 3.3V.

53

**PD

IN

Enter /Exit Power Down.

1 = Power Down, 0 = normal operation.

54

FS2/REF2

I/O

Frequency select latch input pin/ 3.3V 14.318MHz reference clock

55

FS1/REF1

I/O

Frequency select latch input pin/ 3.3V 14.318MHz reference clock

56

FS0/REF0

I/O

Frequency select latch input pin/ 3.3V 14.318MHz reference clock