One Stop Systems, Inc. Host Cable Adapter User Manual
Rev. A
6
Connectors
PCIe x4 Card Edge Connector
The pins are numbered as shown with side A on the top of the centerline on the solder side of the board and side B on the bottom of
the centerline on the component side of the board.
The PCIe interface pins PETpx, PETnx, PERpx, and PERnx are named with the following convention: “PE” stands for PCIe high
speed, “T” for Transmitter, “R” for Receiver, “p” for positive (+), and “n” for negative (-).
Note that adjacent differential pairs are separated by two ground pins to manage the connector crosstalk.
Pin-out for the PCIe x4 Card Edge Connector on the Host Cable Adapter
Pin #
Side B
Side A
Name Description
Name Description
1 N/C
N/C
PRSNT1# Hot-Plug presence detect
2 N/C
N/C
N/C
N/C
3 N/C
N/C
N/C
N/C
4 GND
Ground
GND
Ground
5 NC
N/C
N/C
Not
connected
6
N/C
N/C
JTAG3
TDI (Test Data Input)
7
GND
Ground
JTAG4
TDO (Test Data Output)
8
+3.3V
3.3 V power
N/C
Not connected
9
N/C
Not connected
N/C
Not connected
10
3.3Vaux
3.3 V auxiliary power
+3.3V
3.3 V power
11
N/C
N/C
PERST#
Fundamental reset
Mechanical key
12 RSVD
Reserved
GND
Ground
13
GND
Ground
Reference clock (differential pair)
14 PETp0
Transmitter differential pair, Lane 0
REFCLK
15 PETn0
GND
Ground
16 GND
Ground
PERp0
Receiver differential pair, Lane 0
17 PRSNT2#
Hot-Plug
presence
detect
PERn0
18 GND
Ground
GND
Ground
19 PETp1
Transmitter differential pair, Lane 1
RSVD Reserved
20 PETn1
GND
Ground
21 GND
Ground
PERp1
Receiver differential pair, Lane 1
22 GND
Ground
PERn1
23 PETp2
Transmitter differential pair, Lane 2
GND Ground
24 PETn2
GND
Ground
25 GND
Ground
PERp2
Receiver differential pair, Lane 2
26 GND
Ground
PERn2
27 PETp3
Transmitter differential pair, Lane 3
GND Ground
28 PETn3
GND
Ground
29 GND
Ground
PERp3
Receiver differential pair, Lane 3
30 RSVD
Reserved
PERn3
31 PRSNT2#
Hot-Plug
presence
detect
GND
Ground
32 GND
Ground
RSVD
Reserved
