One Stop Systems MAX Expansion OSS-KIT-EXP-2000, User Manual

Page: 9 / 13

One Stop Systems OSS-KIT-EXP-2000-2M
Page 9
4.c. Pin Assignments
Host adapter card 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 interf
ace 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