932SQ425
PCIE GEN2/3 & QPI CLOCK FOR ROMLEY-BASED SERVERS
IDT®
PCIE GEN2/3 & QPI CLOCK FOR ROMLEY-BASED SERVERS 3
932SQ425 REV B 042312
Pin Descriptions
PIN # PIN NAME TYPE DESCRIPTION
1 GNDPCI PWR Ground pin for PCI outputs and logic.
2 VDDPCI PWR 3.3V power for the PCI out puts and logic
3 PCI2_2x OUT 3.3V PCI clock output
4 PCI1_2x OUT 3.3V PCI clock output
5 PCI0_2x OUT 3.3V PCI clock output
6 GNDPCI PWR Ground pin for PCI outputs and logic.
7 VDDPCI PWR 3.3V power for the PCI out puts and logic
8 VDD48 PWR 3.3V power for the 48MHz output and logic
9 ^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 o
eratin
fre
uenc
10 GND48 PWR Ground pin for 48MHz output and logic.
11 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 re
uired for termination.
Complementary clock of different ial 96MHz output. These are current mode outputs and external 33 ohm
series resistors and 49.9 ohm shunt resistors are re
uired for termination.
14 AVDD96 PWR 3.3V
ower for the 48/96MHz PLL and the 96MHz out
ut and lo
ic
15 TEST_MODE IN
TEST_M ODE is a real time input to select between Hi-Z and REF/N divider mode while in test mode. Refer t o
Test Clarification Table.
16 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 sto
ed.
17 VDDSRC PWR 3.3V
ower for the SRC out
uts and lo
ic
18 GNDSRC PWR Ground
in for SRC out
uts and lo
ic.
19 SRC0C OUT
Complementary clock of differential SRC output. The se are current mode outputs and extern al 33 ohm
series resistors and 49.9 ohm shunt resistors are re
uired for termination.
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 SRC1C OUT
Complementary clock of different ial 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 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.
23 VDDSRC PWR 3.3V power for the SRC outputs and logic
24 AVDD_SRC PWR 3.3V power for the SRC PLL an alog circuits
25 GNDSRC PWR Ground pin for SRC outputs and logic.
26 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 approp riate curren t. 475 ohms is the standard
value.
Complementary clock of different ial non-spreading SRC output. These are current mode outputs and external
33 ohm series resistors and 49.9 ohm shunt resistors are required for termination.
28 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 req uired for termination.
29 VDDNS PWR 3.3V power fo r the Non-Spreading dif ferential outputs outputs and logic
30 GNDNS PWR Ground pin for non-spreading differential outputs and logic.
31 NS_SAS0C OUT
Complementary clock of different ia 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.
32 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 req uired for termination.
33 NS_SAS1C OUT
Complementary clock of different ial 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.
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 req uired for termination.
35 AVDD_NS_SAS PWR 3.3V
ower for the non-s
readin
SAS/SRC PLL analo
circuits.
36 GNDNS PWR Ground
in for non-s
readin
differential out
uts and lo
ic.