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 J 010715
Pin Descriptions - 64 MLF
PIN # PIN NAM E TYPE D ESC RIPTION
1 GNDPCI PWR Ground pin for PCI outputs and logic.
2 VDDPCI PWR 3.3V power for the PCI o utput s and logic
3 PCI4_2 x OUT 3.3V PCI clock output
4 PCI3_2 x OUT 3.3V PCI clock output
5 PCI2_2 x OUT 3.3V PCI clock output
6 PCI1_2 x OUT 3.3V PCI clock output
7 PCI0_2 x OUT 3.3V PCI clock output
8 GNDPCI PWR Ground pin for PCI outputs and logic.
9 VDDPCI PWR 3.3V power for the PCI o utput s 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 f requency 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
12 GND48 PWR Ground
in for 48MHz out
ut and lo
ic.
13 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.
15 DOT96C OUT
Complementary clock of d ifferential 96MHz output. These are current mode outputs and e xternal 33 ohm
series resistors and 49.9 ohm shunt resistors are re
uired for termination.
16 AVDD96 PWR 3.3V
ower for the 48/96MHz PLL and the 9 6MHz out
ut and lo
ic
17 TEST_MODE 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 sto
ed.
19 VDDSRC 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 re
uired 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 o utputs and external 33 ohm series
resistors and 49.9 ohm shunt resistors are re
uired 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 re
uired for termination.
Complementary clock of differential SRC output. These are current mode o utputs 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 VDDSRC 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 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
va lue .
31 NS_SRC0C OUT
Complementary clock of differential 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.
32 NS_SRC0T OUT
True clock of differential non-spreading SRC out put. Th ese are current mode outputs. These are current
mode outputs and external 33 ohm series re sistors and 49.9 ohm shunt resistors are required for termination.
33 NS_SRC1C OUT
Complementary clock of differential non-spreading SRC 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_SRC1T OUT
True clock of differential non-spreading SRC output. These are current mode outputs. These are current
mode outputs and external 33 ohm series re sistors and 49.9 ohm shunt resistors are required for termination.
