2
ICS932S801
0959C—03/13/06
Pin Descriptions
PIN # PIN NAME PIN TYPE DESCRIPTION
1X1 IN Crystal input, Nominally 14.318MHz.
2 X2 OUT Cr
stal output, Nominall
14.318MHz
3 VDD48 PWR Power pin for the 48MHz output.3.3V
4 48MHz_0 OUT 48MHz clock output.
5 48MHz_1 OUT 48MHz clock output.
6 GND PWR Ground pin.
7 SCLK I/O Clock pin of SMBus circuitry, 5V tolerant.
8 SDATA I/O Data pin for SMBus circuitr
, 5V tolerant.
9 VDDHTT PWR Supply for HTT clocks, nominal 3.3V.
10 HTTCLK0 OUT 3.3V H
per Transport output
11 HTTCLK1 OUT 3.3V Hyper Transport output
12 HTTCLK2 OUT 3.3V H
per Transport output
13 HTTCLK3 OUT 3.3V Hyper Transport output
14 GNDHTT PWR Ground pin for the HTT outputs
15 VDDPCI PWR Power supply for PCI clocks, nominal 3.3V
16 PCICLK0 OUT PCI clock output.
17 PCICLK1 OUT PCI clock output.
18 PCICLK2 OUT PCI clock output.
19 PCICLK3 OUT PCI clock output.
20 GNDPCI PWR Ground pin for the PCI outputs
21 PD# IN Asynchronous active low input pin used to power down the device. The internal
clocks are disabled and the VCO and the cr
stal are stopped.
22 VDDA PWR 3.3V power for the PLL core.
23 GNDA OUT Ground pin for the PLL core.
24 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.
25 SRCCLKC0 OUT Complement clock of differential SRC clock pair.
26 SRCCLKT0 OUT True clock of differential SRC clock pair.
27 VDDSRC PWR Suppl
for SRC clocks, 3.3V nominal
28 GNDSRC PWR Ground pin for the SRC outputs
29 SPREAD_EN IN As
nchronous, active hi
h input to enable spread spectrum functionalit
.
30 CPUCLK8C3 OUT Complementary clock of differential 3.3V push-pull K8 pair.
31 CPUCLK8T3 OUT True clock of differential 3.3V push-pull K8 pair.
32 GNDCPU PWR Ground pin for the CPU outputs
33 VDDCPU PWR Suppl
for CPU clocks, 3.3V nominal
34 CPUCLK8C2 OUT Complementary clock of differential 3.3V push-pull K8 pair.
35 CPUCLK8T2 OUT True clock of differential 3.3V push-pull K8 pair.
36 GNDCPU PWR Ground pin for the CPU outputs
37 VDDCPU PWR Suppl
for CPU clocks, 3.3V nominal
38 CPUCLK8C1 OUT Complementary clock of differential 3.3V push-pull K8 pair.
39 CPUCLK8T1 OUT True clock of differential 3.3V push-pull K8 pair.
40 GNDCPU PWR Ground pin for the CPU outputs
41 VDDCPU PWR Suppl
for CPU clocks, 3.3V nominal
42 CPUCLK8C0 OUT Complementary clock of differential 3.3V push-pull K8 pair.
43 CPUCLK8T0 OUT True clock of differential 3.3V push-pull K8 pair.
44 GND PWR Ground pin.
45 FS2 IN Frequenc
select pin.
46 FS1/REF1 I/O Frequency select latch input pin / 14.318 MHz reference clock.
47 FS0/REF0 I/O Frequenc
select latch input pin / 14.318 MHz reference clock.
48 VDDREF PWR Ref, XTAL power supply, nominal 3.3V