3

ICS951412

0883G—12/08/04

PIN

#

PIN NAME

TYPE

DESCRIPTION

29

ATIGCLKC0

OUT

Complementary clock of differential SRC clock pair.

30

ATIGCLKT0

OUT

True clock of differential SRC clock pair.

31

GNDATI

PWR

Ground for ATI Gclocks, nominal 3.3V

32

VDDATI

PWR

Power supply ATI Gclocks, nominal 3.3V

33

SRCCLKC0

OUT

Complement clock of differential SRC clock pair.

34

SRCCLKT0

OUT

True clock of differential SRC clock pair.

35

VDDSRC

PWR

Supply for SRC clocks, 3.3V nominal

36

GNDSRC

PWR

Ground pin for the SRC outputs

37

IREF

OUT

This pin establishes the reference current for the differential current-mode

output pairs. This pin requires a fixed precision resistor tied to ground in

order to establish the appropriate current. 475 ohms is the standard value.

38

GNDA

PWR

Ground pin for the PLL core.

39

VDDA

PWR

3.3V power for the PLL core.

40

CPUCLK8C1

OUT

Complementary clock of differential 3.3V push-pull K8 pair.

41

CPUCLK8T1

OUT

True clock of differential 3.3V push-pull K8 pair.

42

GNDCPU

PWR

Ground pin for the CPU outputs

43

VDDCPU

PWR

Supply for CPU clocks, 3.3V nominal

44

CPUCLK8C0

OUT

Complementary clock of differential 3.3V push-pull K8 pair.

45

CPUCLK8T0

OUT

True clock of differential 3.3V push-pull K8 pair.

46

GNDHTT

PWR

Ground pin for the HTT outputs

47

HTTCLK0

OUT

3.3V Hyper Transport output

48

VDDHTT

PWR

Supply for HTT clocks, nominal 3.3V.

49

GNDPCI

PWR

Ground pin for the PCI outputs

50

PCICLK0

OUT

PCI clock output.

51

VDDPCI

PWR

Power supply for PCI clocks, nominal 3.3V

52

REF2

OUT

14.318 MHz reference clock.

53

**FS1/REF1

I/O

Frequency select latch input pin / 14.318 MHz reference clock.

54

**FS0/REF0

I/O

Frequency select latch input pin / 14.318 MHz reference clock.

55

GND

PWR

Ground pin.

56

VDDREF

PWR

Ref, XTAL power supply, nominal 3.3V

Pin Descriptions (Continued)