PCI Express 1x, 4x, 8x, 16x bus connector pinout

#Computer#Buses and Slots

PCI Express is the new serial bus addition to the PCI series of specifications.

PCI Express as a high-bandwidth, low pin count, serial, interconnect technology. PCI Express architecture provides a high performance I/O infrastructure for Desktop Platforms with transfer rates starting at 2.5 Giga transfers per second over a x1 PCI Express lane for Gigabit Ethernet, TV Tuners, 1394a/b controllers, and general purpose I/O. PCI Express architecture provides a high performance graphics infrastructure for Desktop Platforms doubling the capability of existing AGP8x designs with transfer rates of 4.0 Gigabytes per second over a x16 PCI Express lane for graphics controllers. ExpressCard™ utilizing PCI Express interface, developed by the PCMCIA group for mobile computers. PCI Express Advanced Power Management features help to extend platform battery life and to enable users to work anywhere, without an AC power source. The broad adoption of PCI Express in the mobile, enterprise and communication segments enables convergence through the re-use of a common interconnect technology. PCI-E is a serial bus which uses two low-voltage differential LVDS pairs, at 2.5Gb/s in each direction [one transmit, and one receive pair]. PCI Express supports 1x [2.5Gbps], 2x, 4x, 8x, 12x, 16x, and 32x bus widths [transmit / receive pairs]. The differential pins [Lanes] listed in the pin out table above are LVDS which stands for: Low Voltage Differential Signaling.

PCI-Express 1x Connector Pin-Out

PinSide B ConnectorSide A Connector
#NameDescriptionNameDescription
1+12v+12 volt powerPRSNT#1Hot plug presence detect
2+12v+12 volt power+12v+12 volt power
3RSVDReserved+12v+12 volt power
4GNDGroundGNDGround
5SMCLKSMBus clockJTAG2TCK
6SMDATSMBus dataJTAG3TDI
7GNDGroundJTAG4TDO
8+3.3v+3.3 volt powerJTAG5TMS
9JTAG1+TRST#+3.3v+3.3 volt power
103.3Vaux3.3v volt power+3.3v+3.3 volt power
11WAKE#Link ReactivationPWRGDPower Good
Mechanical Key
12RSVDReservedGNDGround
13GNDGroundREFCLK+Reference Clock
Differential pair
14HSOp(0)Transmitter Lane 0,
Differential pair
REFCLK-
15HSOn(0)GNDGround
16GNDGroundHSIp(0)Receiver Lane 0,
Differential pair
17PRSNT#2Hotplug detectHSIn(0)
18GNDGroundGNDGround

PCI-Express 4x Connector Pin-Out

PinSide B ConnectorSide A Connector
#NameDescriptionNameDescription
1+12v+12 volt powerPRSNT#1Hot plug presence detect
2+12v+12 volt power+12v+12 volt power
3RSVDReserved+12v+12 volt power
4GNDGroundGNDGround
5SMCLKSMBus clockJTAG2TCK
6SMDATSMBus dataJTAG3TDI
7GNDGroundJTAG4TDO
8+3.3v+3.3 volt powerJTAG5TMS
9JTAG1+TRST#+3.3v+3.3 volt power
103.3Vaux3.3v volt power+3.3v+3.3 volt power
11WAKE#Link ReactivationPWRGDPower Good
Mechanical Key
12RSVDReservedGNDGround
13GNDGroundREFCLK+Reference Clock
Differential pair
14HSOp(0)Transmitter Lane 0,
Differential pair
REFCLK-
15HSOn(0)GNDGround
16GNDGroundHSIp(0)Receiver Lane 0,
Differential pair
17PRSNT#2Hotplug detectHSIn(0)
18GNDGroundGNDGround
19HSOp(1)Transmitter Lane 1,
Differential pair
RSVDReserved
20HSOn(1)GNDGround
21GNDGroundHSIp(1)Receiver Lane 1,
Differential pair
22GNDGroundHSIn(1)
23HSOp(2)Transmitter Lane 2,
Differential pair
GNDGround
24HSOn(2)GNDGround
25GNDGroundHSIp(2)Receiver Lane 2,
Differential pair
26GNDGroundHSIn(2)
27HSOp(3)Transmitter Lane 3,
Differential pair
GNDGround
28HSOn(0)GNDGround
29GNDGroundHSIp(3)Receiver Lane 3,
Differential pair
30RSVDReservedHSIn(3)
31PRSNT#2Hot plug detectGNDGround
32GNDGroundRSVDReserved

PCI-Express 8x Connector Pin-Out

PinSide B ConnectorSide A Connector
#NameDescriptionNameDescription
1+12v+12 volt powerPRSNT#1Hot plug presence detect
2+12v+12 volt power+12v+12 volt power
3RSVDReserved+12v+12 volt power
4GNDGroundGNDGround
5SMCLKSMBus clockJTAG2TCK
6SMDATSMBus dataJTAG3TDI
7GNDGroundJTAG4TDO
8+3.3v+3.3 volt powerJTAG5TMS
9JTAG1+TRST#+3.3v+3.3 volt power
103.3Vaux3.3v volt power+3.3v+3.3 volt power
11WAKE#Link ReactivationPWRGDPower Good
Mechanical Key
12RSVDReservedGNDGround
13GNDGroundREFCLK+Reference Clock
Differential pair
14HSOp(0)Transmitter Lane 0,
Differential pair
REFCLK-
15HSOn(0)GNDGround
16GNDGroundHSIp(0)Receiver Lane 0,
Differential pair
17PRSNT#2Hotplug detectHSIn(0)
18GNDGroundGNDGround
19HSOp(1)Transmitter Lane 1,
Differential pair
RSVDReserved
20HSOn(1)GNDGround
21GNDGroundHSIp(1)Receiver Lane 1,
Differential pair
22GNDGroundHSIn(1)
23HSOp(2)Transmitter Lane 2,
Differential pair
GNDGround
24HSOn(2)GNDGround
25GNDGroundHSIp(2)Receiver Lane 2,
Differential pair
26GNDGroundHSIn(2)
27HSOp(3)Transmitter Lane 3,
Differential pair
GNDGround
28HSOn(0)GNDGround
29GNDGroundHSIp(3)Receiver Lane 3,
Differential pair
30RSVDReservedHSIn(3)
31PRSNT#2Hot plug detectGNDGround
32GNDGroundRSVDReserved
33HSOp(4)Transmitter Lane 4,
Differential pair
RSVDReserved
34HSOn(4)GNDGround
35GNDGroundHSIp(4)Receiver Lane 4,
Differential pair
36GNDGroundHSIn(4)
37HSOp(5)Transmitter Lane 5,
Differential pair
GNDGround
38HSOn(5)GNDGround
39GNDGroundHSIp(5)Receiver Lane 5,
Differential pair
40GNDGroundHSIn(5)
41HSOp(6)Transmitter Lane 6,
Differential pair
GNDGround
42HSOn(6)GNDGround
43GNDGroundHSIp(6)Receiver Lane 6,
Differential pair
44GNDGroundHSIn(6)
45HSOp(7)Transmitter Lane 7,
Differential pair
GNDGround
46HSOn(7)GNDGround
47GNDGroundHSIp(7)Receiver Lane 7,
Differential pair
48PRSNT#2Hot plug detectHSIn(7)
49GNDGroundGNDGround

PCI-Express 16x Connector Pin-Out

PinSide B ConnectorSide A Connector
#NameDescriptionNameDescription
1+12v+12 volt powerPRSNT#1Hot plug presence detect
2+12v+12 volt power+12v+12 volt power
3RSVDReserved+12v+12 volt power
4GNDGroundGNDGround
5SMCLKSMBus clockJTAG2TCK
6SMDATSMBus dataJTAG3TDI
7GNDGroundJTAG4TDO
8+3.3v+3.3 volt powerJTAG5TMS
9JTAG1+TRST#+3.3v+3.3 volt power
103.3Vaux3.3v volt power+3.3v+3.3 volt power
11WAKE#Link ReactivationPWRGDPower Good
Mechanical Key
12RSVDReservedGNDGround
13GNDGroundREFCLK+Reference Clock
Differential pair
14HSOp(0)Transmitter Lane 0,
Differential pair
REFCLK-
15HSOn(0)GNDGround
16GNDGroundHSIp(0)Receiver Lane 0,
Differential pair
17PRSNT#2Hotplug detectHSIn(0)
18GNDGroundGNDGround
19HSOp(1)Transmitter Lane 1,
Differential pair
RSVDReserved
20HSOn(1)GNDGround
21GNDGroundHSIp(1)Receiver Lane 1,
Differential pair
22GNDGroundHSIn(1)
23HSOp(2)Transmitter Lane 2,
Differential pair
GNDGround
24HSOn(2)GNDGround
25GNDGroundHSIp(2)Receiver Lane 2,
Differential pair
26GNDGroundHSIn(2)
27HSOp(3)Transmitter Lane 3,
Differential pair
GNDGround
28HSOn(0)GNDGround
29GNDGroundHSIp(3)Receiver Lane 3,
Differential pair
30RSVDReservedHSIn(3)
31PRSNT#2Hot plug detectGNDGround
32GNDGroundRSVDReserved
33HSOp(4)Transmitter Lane 4,
Differential pair
RSVDReserved
34HSOn(4)GNDGround
35GNDGroundHSIp(4)Receiver Lane 4,
Differential pair
36GNDGroundHSIn(4)
37HSOp(5)Transmitter Lane 5,
Differential pair
GNDGround
38HSOn(5)GNDGround
39GNDGroundHSIp(5)Receiver Lane 5,
Differential pair
40GNDGroundHSIn(5)
41HSOp(6)Transmitter Lane 6,
Differential pair
GNDGround
42HSOn(6)GNDGround
43GNDGroundHSIp(6)Receiver Lane 6,
Differential pair
44GNDGroundHSIn(6)
45HSOp(7)Transmitter Lane 7,
Differential pair
GNDGround
46HSOn(7)GNDGround
47GNDGroundHSIp(7)Receiver Lane 7,
Differential pair
48PRSNT#2Hot plug detectHSIn(7)
49GNDGroundGNDGround
50HSOp(8)Transmitter Lane 8,
Differential pair
RSVDReserved
51HSOn(8)GNDGround
52GNDGroundHSIp(8)Receiver Lane 8,
Differential pair
53GNDGroundHSIn(8)
54HSOp(9)Transmitter Lane 9,
Differential pair
GNDGround
55HSOn(9)GNDGround
56GNDGroundHSIp(9)Receiver Lane 9,
Differential pair
57GNDGroundHSIn(9)
58HSOp(10)Transmitter Lane 10,
Differential pair
GNDGround
59HSOn(10)GNDGround
60GNDGroundHSIp(10)Receiver Lane 10,
Differential pair
61GNDGroundHSIn(10)
62HSOp(11)Transmitter Lane 11,
Differential pair
GNDGround
63HSOn(11)GNDGround
64GNDGroundHSIp(11)Receiver Lane 11,
Differential pair
65GNDGroundHSIn(11)
66HSOp(12)Transmitter Lane 12,
Differential pair
GNDGround
67HSOn(12)GNDGround
68GNDGroundHSIp(12)Receiver Lane 12,
Differential pair
69GNDGroundHSIn(12)
70HSOp(13)Transmitter Lane 13,
Differential pair
GNDGround
71HSOn(13)GNDGround
72GNDGroundHSIp(13)Receiver Lane 13,
Differential pair
73GNDGroundHSIn(13)
74HSOp(14)Transmitter Lane 14,
Differential pair
GNDGround
75HSOn(14)GNDGround
76GNDGroundHSIp(14)Receiver Lane 14,
Differential pair
77GNDGroundHSIn(14)
78HSOp(15)Transmitter Lane 15,
Differential pair
GNDGround
79HSOn(15)GNDGround
80GNDGroundHSIp(15)Receiver Lane 15,
Differential pair
81PRSNT#2Hot plug present detectHSIn(15)
82RSVD#2Hot Plug DetectGNDGround

PCI bus connector pinout

PCMCIA (PC Card) bus connector pinout