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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

Pin
Side B Connector
Side A Connector
# Name Description Name Description
1 +12v +12 volt power PRSNT#1 Hot plug presence detect
2 +12v +12 volt power +12v +12 volt power
3 RSVD Reserved +12v +12 volt power
4 GND Ground GND Ground
5 SMCLK SMBus clock JTAG2 TCK
6 SMDAT SMBus data JTAG3 TDI
7 GND Ground JTAG4 TDO
8 +3.3v +3.3 volt power JTAG5 TMS
9 JTAG1 +TRST# +3.3v +3.3 volt power
10 3.3Vaux 3.3v volt power +3.3v +3.3 volt power
11 WAKE# Link Reactivation PWRGD Power Good
Mechanical Key
12 RSVD Reserved GND Ground
13 GND Ground REFCLK+ Reference Clock
Differential pair
14 HSOp(0) Transmitter Lane 0,
Differential pair
REFCLK-
15 HSOn(0) GND Ground
16 GND Ground HSIp(0) Receiver Lane 0,
Differential pair
17 PRSNT#2 Hotplug detect HSIn(0)
18 GND Ground GND Ground

PCI-Express 4x Connector Pin-Out

Pin
Side B Connector
Side A Connector
# Name Description Name Description
1 +12v +12 volt power PRSNT#1 Hot plug presence detect
2 +12v +12 volt power +12v +12 volt power
3 RSVD Reserved +12v +12 volt power
4 GND Ground GND Ground
5 SMCLK SMBus clock JTAG2 TCK
6 SMDAT SMBus data JTAG3 TDI
7 GND Ground JTAG4 TDO
8 +3.3v +3.3 volt power JTAG5 TMS
9 JTAG1 +TRST# +3.3v +3.3 volt power
10 3.3Vaux 3.3v volt power +3.3v +3.3 volt power
11 WAKE# Link Reactivation PWRGD Power Good
Mechanical Key
12 RSVD Reserved GND Ground
13 GND Ground REFCLK+ Reference Clock
Differential pair
14 HSOp(0) Transmitter Lane 0,
Differential pair
REFCLK-
15 HSOn(0) GND Ground
16 GND Ground HSIp(0) Receiver Lane 0,
Differential pair
17 PRSNT#2 Hotplug detect HSIn(0)
18 GND Ground GND Ground
19 HSOp(1) Transmitter Lane 1,
Differential pair
RSVD Reserved
20 HSOn(1) GND Ground
21 GND Ground HSIp(1) Receiver Lane 1,
Differential pair
22 GND Ground HSIn(1)
23 HSOp(2) Transmitter Lane 2,
Differential pair
GND Ground
24 HSOn(2) GND Ground
25 GND Ground HSIp(2) Receiver Lane 2,
Differential pair
26 GND Ground HSIn(2)
27 HSOp(3) Transmitter Lane 3,
Differential pair
GND Ground
28 HSOn(3) GND Ground
29 GND Ground HSIp(3) Receiver Lane 3,
Differential pair
30 RSVD Reserved HSIn(3)
31 PRSNT#2 Hot plug detect GND Ground
32 GND Ground RSVD Reserved

PCI-Express 8x Connector Pin-Out

Pin
Side B Connector
Side A Connector
# Name Description Name Description
1 +12v +12 volt power PRSNT#1 Hot plug presence detect
2 +12v +12 volt power +12v +12 volt power
3 RSVD Reserved +12v +12 volt power
4 GND Ground GND Ground
5 SMCLK SMBus clock JTAG2 TCK
6 SMDAT SMBus data JTAG3 TDI
7 GND Ground JTAG4 TDO
8 +3.3v +3.3 volt power JTAG5 TMS
9 JTAG1 +TRST# +3.3v +3.3 volt power
10 3.3Vaux 3.3v volt power +3.3v +3.3 volt power
11 WAKE# Link Reactivation PWRGD Power Good
Mechanical Key
12 RSVD Reserved GND Ground
13 GND Ground REFCLK+ Reference Clock
Differential pair
14 HSOp(0) Transmitter Lane 0,
Differential pair
REFCLK-
15 HSOn(0) GND Ground
16 GND Ground HSIp(0) Receiver Lane 0,
Differential pair
17 PRSNT#2 Hotplug detect HSIn(0)
18 GND Ground GND Ground
19 HSOp(1) Transmitter Lane 1,
Differential pair
RSVD Reserved
20 HSOn(1) GND Ground
21 GND Ground HSIp(1) Receiver Lane 1,
Differential pair
22 GND Ground HSIn(1)
23 HSOp(2) Transmitter Lane 2,
Differential pair
GND Ground
24 HSOn(2) GND Ground
25 GND Ground HSIp(2) Receiver Lane 2,
Differential pair
26 GND Ground HSIn(2)
27 HSOp(3) Transmitter Lane 3,
Differential pair
GND Ground
28 HSOn(3) GND Ground
29 GND Ground HSIp(3) Receiver Lane 3,
Differential pair
30 RSVD Reserved HSIn(3)
31 PRSNT#2 Hot plug detect GND Ground
32 GND Ground RSVD Reserved
33 HSOp(4) Transmitter Lane 4,
Differential pair
RSVD Reserved
34 HSOn(4) GND Ground
35 GND Ground HSIp(4) Receiver Lane 4,
Differential pair
36 GND Ground HSIn(4)
37 HSOp(5) Transmitter Lane 5,
Differential pair
GND Ground
38 HSOn(5) GND Ground
39 GND Ground HSIp(5) Receiver Lane 5,
Differential pair
40 GND Ground HSIn(5)
41 HSOp(6) Transmitter Lane 6,
Differential pair
GND Ground
42 HSOn(6) GND Ground
43 GND Ground HSIp(6) Receiver Lane 6,
Differential pair
44 GND Ground HSIn(6)
45 HSOp(7) Transmitter Lane 7,
Differential pair
GND Ground
46 HSOn(7) GND Ground
47 GND Ground HSIp(7) Receiver Lane 7,
Differential pair
48 PRSNT#2 Hot plug detect HSIn(7)
49 GND Ground GND Ground

PCI-Express 16x Connector Pin-Out

Pin
Side B Connector
Side A Connector
# Name Description Name Description
1 +12v +12 volt power PRSNT#1 Hot plug presence detect
2 +12v +12 volt power +12v +12 volt power
3 RSVD Reserved +12v +12 volt power
4 GND Ground GND Ground
5 SMCLK SMBus clock JTAG2 TCK
6 SMDAT SMBus data JTAG3 TDI
7 GND Ground JTAG4 TDO
8 +3.3v +3.3 volt power JTAG5 TMS
9 JTAG1 +TRST# +3.3v +3.3 volt power
10 3.3Vaux 3.3v volt power +3.3v +3.3 volt power
11 WAKE# Link Reactivation PWRGD Power Good
Mechanical Key
12 RSVD Reserved GND Ground
13 GND Ground REFCLK+ Reference Clock
Differential pair
14 HSOp(0) Transmitter Lane 0,
Differential pair
REFCLK-
15 HSOn(0) GND Ground
16 GND Ground HSIp(0) Receiver Lane 0,
Differential pair
17 PRSNT#2 Hotplug detect HSIn(0)
18 GND Ground GND Ground
19 HSOp(1) Transmitter Lane 1,
Differential pair
RSVD Reserved
20 HSOn(1) GND Ground
21 GND Ground HSIp(1) Receiver Lane 1,
Differential pair
22 GND Ground HSIn(1)
23 HSOp(2) Transmitter Lane 2,
Differential pair
GND Ground
24 HSOn(2) GND Ground
25 GND Ground HSIp(2) Receiver Lane 2,
Differential pair
26 GND Ground HSIn(2)
27 HSOp(3) Transmitter Lane 3,
Differential pair
GND Ground
28 HSOn(3) GND Ground
29 GND Ground HSIp(3) Receiver Lane 3,
Differential pair
30 RSVD Reserved HSIn(3)
31 PRSNT#2 Hot plug detect GND Ground
32 GND Ground RSVD Reserved
33 HSOp(4) Transmitter Lane 4,
Differential pair
RSVD Reserved
34 HSOn(4) GND Ground
35 GND Ground HSIp(4) Receiver Lane 4,
Differential pair
36 GND Ground HSIn(4)
37 HSOp(5) Transmitter Lane 5,
Differential pair
GND Ground
38 HSOn(5) GND Ground
39 GND Ground HSIp(5) Receiver Lane 5,
Differential pair
40 GND Ground HSIn(5)
41 HSOp(6) Transmitter Lane 6,
Differential pair
GND Ground
42 HSOn(6) GND Ground
43 GND Ground HSIp(6) Receiver Lane 6,
Differential pair
44 GND Ground HSIn(6)
45 HSOp(7) Transmitter Lane 7,
Differential pair
GND Ground
46 HSOn(7) GND Ground
47 GND Ground HSIp(7) Receiver Lane 7,
Differential pair
48 PRSNT#2 Hot plug detect HSIn(7)
49 GND Ground GND Ground
50 HSOp(8) Transmitter Lane 8,
Differential pair
RSVD Reserved
51 HSOn(8) GND Ground
52 GND Ground HSIp(8) Receiver Lane 8,
Differential pair
53 GND Ground HSIn(8)
54 HSOp(9) Transmitter Lane 9,
Differential pair
GND Ground
55 HSOn(9) GND Ground
56 GND Ground HSIp(9) Receiver Lane 9,
Differential pair
57 GND Ground HSIn(9)
58 HSOp(10) Transmitter Lane 10,
Differential pair
GND Ground
59 HSOn(10) GND Ground
60 GND Ground HSIp(10) Receiver Lane 10,
Differential pair
61 GND Ground HSIn(10)
62 HSOp(11) Transmitter Lane 11,
Differential pair
GND Ground
63 HSOn(11) GND Ground
64 GND Ground HSIp(11) Receiver Lane 11,
Differential pair
65 GND Ground HSIn(11)
66 HSOp(12) Transmitter Lane 12,
Differential pair
GND Ground
67 HSOn(12) GND Ground
68 GND Ground HSIp(12) Receiver Lane 12,
Differential pair
69 GND Ground HSIn(12)
70 HSOp(13) Transmitter Lane 13,
Differential pair
GND Ground
71 HSOn(13) GND Ground
72 GND Ground HSIp(13) Receiver Lane 13,
Differential pair
73 GND Ground HSIn(13)
74 HSOp(14) Transmitter Lane 14,
Differential pair
GND Ground
75 HSOn(14) GND Ground
76 GND Ground HSIp(14) Receiver Lane 14,
Differential pair
77 GND Ground HSIn(14)
78 HSOp(15) Transmitter Lane 15,
Differential pair
GND Ground
79 HSOn(15) GND Ground
80 GND Ground HSIp(15) Receiver Lane 15,
Differential pair
81 PRSNT#2 Hot plug present detect HSIn(15)
82 RSVD#2 Hot Plug Detect GND Ground
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