PCI-E 1x, 4x, 8x, 16x 接口定义

1. PCI-E插槽及金手指实物图

PCI-E插槽，从上至下依次为PCI-E 4X、PCI-E 16X、PCI-E 1X。



PCI-E 1X金手指：



PCI-E 4X金手指：



PCI-E 16X金手指：

2. PCI-E接口定义

说明：

Ground pin	Zero volt reference
Power pin	Supplies power to the PCIe card
Card-to-host pin	Signal from the card to the motherboard
Host-to-card pin	Signal from the motherboard to the card
Open drain	May be pulled low or sensed by multiple cards
Sense pin	Tied together on card
Reserved	Not presently used, do not connect

PCI-Express 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
14	HSOp(0)	Transmitter Lane 0,	REFCLK-	Differential pair
15	HSOn(0)	Differential pair	GND	Ground
16	GND	Ground	HSIp(0)	Receiver Lane 0,
17	PRSNT#2	Hotplug detect	HSIn(0)	Differential pair
18	GND	Ground	GND	Ground
End of the 1X connector
19	HSOp(1)	Transmitter Lane 1,	RSVD	Reserved
20	HSOn(1)	Differential pair	GND	Ground
21	GND	Ground	HSIp(1)	Receiver Lane 1,
22	GND	Ground	HSIn(1)	Differential pair
23	HSOp(2)	Transmitter Lane 2,	GND	Ground
24	HSOn(2)	Differential pair	GND	Ground
25	GND	Ground	HSIp(2)	Receiver Lane 2,
26	GND	Ground	HSIn(2)	Differential pair
27	HSOp(3)	Transmitter Lane 3,	GND	Ground
28	HSOn(3)	Differential pair	GND	Ground
29	GND	Ground	HSIp(3)	Receiver Lane 3,
30	RSVD	Reserved	HSIn(3)	Differential pair
31	PRSNT#2	Hot plug detect	GND	Ground
32	GND	Ground	RSVD	Reserved
End of the 4X connector
33	HSOp(4)	Transmitter Lane 4,	RSVD	Reserved
34	HSOn(4)	Differential pair	GND	Ground
35	GND	Ground	HSIp(4)	Receiver Lane 4,
36	GND	Ground	HSIn(4)	Differential pair
37	HSOp(5)	Transmitter Lane 5,	GND	Ground
38	HSOn(5)	Differential pair	GND	Ground
39	GND	Ground	HSIp(5)	Receiver Lane 5,
40	GND	Ground	HSIn(5)	Differential pair
41	HSOp(6)	Transmitter Lane 6,	GND	Ground
42	HSOn(6)	Differential pair	GND	Ground
43	GND	Ground	HSIp(6)	Receiver Lane 6,
44	GND	Ground	HSIn(6)	Differential pair
45	HSOp(7)	Transmitter Lane 7,	GND	Ground
46	HSOn(7)	Differential pair	GND	Ground
47	GND	Ground	HSIp(7)	Receiver Lane 7,
48	PRSNT#2	Hot plug detect	HSIn(7)	Differential pair
49	GND	Ground	GND	Ground
End of the 8X connector
50	HSOp(8)	Transmitter Lane 8,	RSVD	Reserved
51	HSOn(8)	Differential pair	GND	Ground
52	GND	Ground	HSIp(8)	Receiver Lane 8,
53	GND	Ground	HSIn(8)	Differential pair
54	HSOp(9)	Transmitter Lane 9,	GND	Ground
55	HSOn(9)	Differential pair	GND	Ground
56	GND	Ground	HSIp(9)	Receiver Lane 9,
57	GND	Ground	HSIn(9)	Differential pair
58	HSOp(10)	Transmitter Lane 10,	GND	Ground
59	HSOn(10)	Differential pair	GND	Ground
60	GND	Ground	HSIp(10)	Receiver Lane 10,
61	GND	Ground	HSIn(10)	Differential pair
62	HSOp(11)	Transmitter Lane 11,	GND	Ground
63	HSOn(11)	Differential pair	GND	Ground
64	GND	Ground	HSIp(11)	Receiver Lane 11,
65	GND	Ground	HSIn(11)	Differential pair
66	HSOp(12)	Transmitter Lane 12,	GND	Ground
67	HSOn(12)	Differential pair	GND	Ground
68	GND	Ground	HSIp(12)	Receiver Lane 12,
69	GND	Ground	HSIn(12)	Differential pair
70	HSOp(13)	Transmitter Lane 13,	GND	Ground
71	HSOn(13)	Differential pair	GND	Ground
72	GND	Ground	HSIp(13)	Receiver Lane 13,
73	GND	Ground	HSIn(13)	Differential pair
74	HSOp(14)	Transmitter Lane 14,	GND	Ground
75	HSOn(14)	Differential pair	GND	Ground
76	GND	Ground	HSIp(14)	Receiver Lane 14,
77	GND	Ground	HSIn(14)	Differential pair
78	HSOp(15)	Transmitter Lane 15,	GND	Ground
79	HSOn(15)	Differential pair	GND	Ground
80	GND	Ground	HSIp(15)	Receiver Lane 15,
81	PRSNT#2	Hot plug present detect	HSIn(15)	Differential pair
82	RSVD#2	Hot Plug Detect	GND	Ground
End of the 16X connector

3. PCI-E传输速率

PCI-E X1	8bit	2.5GHz	512Mb/s(双工)
PCI-E X4	8bit	2.5GHz	2Gb/s(双工)
PCI-E X8	8bit	2.5GHz	4Gb/s(双工)
PCI-E X16	8bit	2.5GHz	8Gb/s(双工)

4. 参考

（1）PCI Express 1x, 4x, 8x, 16x bus pinout

http://pinouts.ru/Slots/pci_express_pinout.shtml

（2）PCI Express

http://en.wikipedia.org/wiki/PCI_Express

（3）PCI、PCI-x，PCI-E兼容以及他们之间的区别详细图解

http://www.jb51.net/hardware/xianka/56902.html