932SQ420D

PCIE GEN 2/3 & QPI CLOCK FOR ROMLEY-BASED SERVERS

IDT®

PCIE GEN 2/3 & QPI CLOCK FOR ROMLEY-BASED SERVERS

6

932SQ420D

REV H 042012

Pin Descriptions - 64 MLF

PIN #

PIN NAME

TYPE

D ESC RIPTION

1

GNDPCI

PWR Ground pin for PCI outputs and logic.

2

VDDPC I

PWR 3.3V power for the PCI outputs and logic

3

PCI4_2x

OUT 3.3V PCI clock output

4

PCI3_2x

OUT 3.3V PCI clock output

5

PCI2_2x

OUT 3.3V PCI clock output

6

PCI1_2x

OUT 3.3V PCI clock output

7

PCI0_2x

OUT 3.3V PCI clock output

8

GNDPCI

PWR Ground pin for PCI outputs and logic.

9

VDDPC I

PWR 3.3V power for the PCI outputs and logic

10

VDD48

PWR 3.3V power for the 48MHz output and logic

11

^48M_2x/100M_133M#

I/O

3.3V 48MHz output/ 3.3V tolerant CPU frequency select latched input pin. See VilFS and VihFS values for

thresholds. This pin has a weak (~120Kom) internal pull up.

1 = 100MHz, 0 = 133MHz operating frequency

12

GND48

PWR Ground pin for 48MH z output and logic.

13

GND96

PWR Ground pin for DOT96 output and logic.

14

DOT96T

OUT

True clock of differential 96MHz output. These are current mode outputs. These are current mode outputs

and external 33 ohm series resistors and 49.9 ohm shunt resistors are required for termination.

15

DOT96C

OUT

Complementary clock of differential 96MHz output. These are current mode outputs and external 33 ohm

series resistors and 49.9 ohm shunt resistors are required for termination.

16

AVDD96

PWR 3.3V power for the 48/96MHz PLL and the 96MHz output and logic

17

TEST_MOD E

IN

TEST_MODE is a real time input to select between Hi-Z and REF/N divider mode while in test mode. Refer to

Test Clarification Table.

18

CKPWRGD#/PD

IN

CKPWRGD# is an active low input used to sample latched inputs and allow the device to Power Up. PD is an

asynchronous active high input pin used to put the device into a low power state. The internal clocks and PLLs

are stopped.

19

VDDSR C

PWR 3.3V power for the SRC outputs and logic

20

SRC0T

OUT

True clock of differential SRC output. These are current mode outputs. These are current mode outputs and

external 33 ohm series resistors and 49.9 ohm shunt resistors are required for termination.

21

SRC0C

OUT

Complementary clock of differential SRC output. These are current mode outputs and external 33 ohm

series resistors and 49.9 ohm shunt resistors are required for termination.

22

GNDSRC

PWR Ground pin for SRC outputs and logic.

23

SRC1C

OUT

Complementary clock of differential SRC output. These are current mode outputs and external 33 ohm series

resistors and 49.9 ohm shunt resistors are required for termination.

24

SRC1T

OUT

True clock of differential SRC output. These are current mode outputs. These are current mode outputs and

external 33 ohm series resistors and 49.9 ohm shunt resistors are required for termination.

25

SRC2C

OUT

Complementary clock of differential SRC output. These are current mode outputs and external 33 ohm series

resistors and 49.9 ohm shunt resistors are required for termination.

26

SRC2T

OUT

True clock of differential SRC output. These are current mode outputs. These are current mode outputs and

external 33 ohm series resistors and 49.9 ohm shunt resistors are required for termination.

27

VDDSR C

PWR 3.3V power for the SRC outputs and logic

28

AVDD_SRC

PWR 3.3V power for the SRC PLL analog circuits

29

GNDSRC

PWR Ground pin for SRC outputs and logic.

30

IR EF

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.

31

NS_SRC0C

OUT

Complementary clock of differential non-spreading SR C output. These are current mode outputs and external

33 ohm series resistors and 49.9 ohm shunt resistors are required for termination.

32

NS_SRC0T

OUT

True clock of differential non-spreading SRC output. These are current mode outputs. These are current

mode outputs and external 33 ohm series resistors and 49.9 ohm shunt resistors are required for termination.

33

NS_SRC1C

OUT

Complementary clock of differential non-spreading SR C output. These are current mode outputs and external

33 ohm series resistors and 49.9 ohm shunt resistors are required for termination.

34

NS_SRC1T

OUT

True clock of differential non-spreading SR C output. These are current mode outputs. These are current

mode outputs and external 33 ohm series resistors and 49.9 ohm shunt resistors are required for termination.