PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV 1.1
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5. Connector Specification
A family of PCI Express vertical edge card connectors supports x1, x4, x8, and x16 Link widths to
suit different bandwidth requirements. These connectors support the PCI Express signal and power
requirements, as well as auxiliary signals used to facilitate the interface between system board and
add-in card hardware. This chapter defines the connector mating interfaces and footprints, as well
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as the electrical, mechanical, and environmental requirements.
5.1. Connector Pinout
Table 5-1 shows the pinout definition for the x1, x4, x8, and x16 PCI Express connectors. The
auxiliary pins are identified in the shaded areas.
Table 5-
15-1: PCI Express Connectors Pinout
Side B Side A
Pin
#
Name Description Name Description
1 +12V 12 V power PRSNT1#
Hot-Plug presence
detect
2 +12V 12 V power +12V 12 V power
3 +12VRSVD 12 V powerReserved +12V 12 V power
4 GND Ground GND Ground
5 SMCLK
SMBus (System
Management Bus) clock
JTAG2
TCK (Test Clock), clock
input for JTAG interface
6 SMDAT
SMBus (System
Management Bus) data
JTAG3 TDI (Test Data Input)
7 GND Ground JTAG4 TDO (Test Data Output)
8 +3.3V 3.3 V power JTAG5
TMS (Test Mode
Select)
9 JTAG1
TRST# (Test Reset)
resets the JTAG
interface
+3.3V 3.3 V power
10 3.3Vaux 3.3 V auxiliary power +3.3V 3.3 V power
11 WAKE#
Signal for Link
reactivation
PERST# Fundamental reset
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