932SQ428
PCIE GEN 2/3 & QPI CLOCK FOR ROMLEY-BASED SERVERS
IDT®
PCIE GEN 2/3 & QPI CLOCK FOR ROMLEY-BASED SERVERS 3
932SQ428 REV E 042312
Pin Descriptions
PIN # PIN NAME TYPE DESCRIPTION
1VDDXTA
PWR 3.3V
ower for the cr
stal oscillator.
GNDPCI PWR Ground
in for PCI out
uts and lo
ic.
PCI4_2x OUT 3.3V PCI clock output
PCI3_2x OUT 3.3V PCI clock out
ut
PCI2_2x OUT 3.3V PCI clock out
ut
PCI1_2x OUT 3.3V PCI clock out
ut
PCI0_2x OUT 3.3V PCI clock output
VDDPCI PWR 3.3V
ower for the PCI out
uts and lo
ic
VDD4
PWR 3.3V power for the 48MHz output and lo
ic
10 48M_2x OUT 3.3V 48MHz out
ut
11 GND48 PWR Ground
in for 48MHz out
ut and lo
ic.
12 GND96 PWR Ground
in for DOT96 out
ut and lo
ic.
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.
14 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 re
uired for termination.
15 VDD9
PWR 3.3V power for the 48/96MHz PLL and the 96MHz output and lo
ic
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 sto
ed.
17 VDDSRC PWR 3.3V
ower for the SRC out
uts and lo
ic
18 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.
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.
20 GNDSRC PWR Ground
in for SRC out
uts and lo
ic.
21 SRCC1 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 re
uired for termination.
22 SRCT1 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.
23 SRCC2 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 re
uired for termination.
24 SRCT2 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 VDDSRC PWR 3.3V
ower for the SRC out
uts and lo
ic
26 AVDDSRC PWR 3.3V
ower for the SRC PLL analo
circuits
27 GNDSRC PWR Ground
in for SRC out
uts and lo
ic.
28 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.
29 NS_SAS0C OUT
Complementary clock of differential non-spreading SAS output. These are current mode outputs
and external 33 ohm series resistors and 49.9 ohm shunt resistors are re
uired for termination.
30 NS_SAS0T OUT
True clock of differential non-spreading SAS 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.
31 VDDNS PWR 3.3V
ower for the Non-S
readin
differential out
uts out
uts and lo
ic
32 GNDNS PWR Ground pin for non-spreadin
differential outputs and lo
ic.
33 NS_SAS1C OUT
Complementary clock of differential non-spreading SAS output. These are current mode outputs
and external 33 ohm series resistors and 49.9 ohm shunt resistors are required for termination.
34 NS_SAS1T OUT
True clock of differential non-spreading SAS output. These are current mode outputs. These are
current mode outputs and external 33 ohm series resistors and 49.9 ohm shunt resistors are
re
uired for termination.
