PCIE接口定义

PCI Express (PCIe, PCI-e) is a high-speed serial computer expansion bus standard.

 

PCI Express as a high-bandwidth, low pin count, serial, interconnect technology. It was designed to replace the older PCI and AGPbus standards. PCIe has numerous improvements over the older standards, including higher maximum system bus throughput, lower I/O pin count and smaller physical footprint, better performance scaling for bus devices, a more detailed error detection and reporting mechanism (Advanced Error Reporting, AER), and native hot-swap functionality. 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, Firewire 1394a/bcontrollers, 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. A lane is composed of two differential signaling pairs, with one pair for receiving data and the other for transmitting.

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 PCI Express electrical interface is also used in some computer storage interfaces SATA Express and M.2.

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	+12v	+12 volt power	+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	+12v	+12 volt power	+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	+12v	+12 volt power	+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 Keycard
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	+12v	+12 volt power	+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

 

PRSNT#1 is connected to GND on motherboard.
Add on card needs to have PRSNT#1 connected to one of PRSNT#2 depending what type of connector is in use.
 

PCI-express standards

PCI Express 1.0a

In 2003, PCI-SIG introduced PCIe 1.0a, with a per-lane data rate of 250 MB/s and a transfer rate of 2.5 gigatransfers per second (GT/s). Transfer rate is expressed in transfers per second instead of bits per second because the number of transfers includes the overhead bits, which do not provide additional throughput; PCIe 1.x uses an 8b/10b encoding scheme, resulting in a 20% (= 2/10) overhead on the raw channel bandwidth.

PCI Express 2.0

PCI-SIG announced the availability of the PCI Express Base 2.0 specification on 15 January 2007. The PCIe 2.0 standard doubles the transfer rate compared with PCIe 1.0 to 5 GT/s and the per-lane throughput rises from 250 MB/s to 500 MB/s. Consequently, a 32-lane PCIe connector (×32) can support an aggregate throughput of up to 16 GB/s. PCIe 2.0 motherboard slots are fully backward compatible with PCIe v1.x cards. PCIe 2.0 cards are also generally backward compatible with PCIe 1.x motherboards, using the available bandwidth of PCI Express 1.1. Overall, graphic cards or motherboards designed for v2.0 will work with the other being v1.1 or v1.0a.  Like 1.x, PCIe 2.0 uses an 8b/10b encoding scheme, therefore delivering, per-lane, an effective 4 Gbit/s max transfer rate from its 5 GT/s raw data rate.

PCI Express 2.1

PCI Express 2.1 (dated March 4, 2009) supports a large proportion of the management, support, and troubleshooting systems planned for full implementation in PCI Express 3.0. However, the speed is the same as PCI Express 2.0. The increase in power from the slot breaks backward compatibility between PCI Express 2.1 cards and some older motherboards with 1.0/1.0a, but most motherboards with PCI Express 1.1 connectors are provided with a BIOS update by their manufacturers through utilities to support backward compatibility of cards with PCIe 2.1.

PCI Express 3.0

PCI Express 3.0 specification was made available in November 2010. New features for the PCI Express 3.0 specification include a number of optimizations for enhanced signaling and data integrity, including transmitter and receiver equalization, PLL improvements, clock data recovery, and channel enhancements for currently supported topologies. PCI Express 3.0 upgrades the encoding scheme to 128b/130b from the previous 8b/10b encoding, reducing the bandwidth overhead from 20% of PCI Express 2.0 to approximately 1.54% (= 2/130). This is achieved by XORing a known binary polynomial as a scrambler to the data stream in a feedback topology. PCI Express 3.0's 8 GT/s bit rate effectively delivers 985 MB/s per lane, nearly doubling the lane bandwidth relative to PCI Express 2.0.

PCI Express 4.0

PCI Express 4.0 was officially announced on 2017, providing a 16 GT/s bit rate that doubles the bandwidth provided by PCI Express 3.0, while maintaining backward and forward compatibility in both software support and used mechanical interface. PCI Express 4.0 specs will also bring OCuLink-2, an alternative to Thunderbolt connector. OCuLink version 2 will have up to 16 GT/s (8 GB/s total for ×4 lanes), while the maximum bandwidth of a Thunderbolt 3 connector is 5 GB/s. Additionally, active and idle power optimizations are to be investigated.