Pin Assignments - One Stop Systems Max Express OSS-KIT-EXP-4500 User Manual

4.c. Pin Assignments
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.
Table 1: Pin-out for the PCIe x4 Card Edge Connector on the Host Cable Adapter
Side B
Pin #
Name
1 N/C
2 N/C
3 N/C
4 GND
5 NC
6 N/C
7 GND
8 +3.3V
9 N/C
10 3.3Vaux
11 N/C
12 RSVD
13 GND
14 PETp0
15 PETn0
16 GND
17 PRSNT2#
18 GND
19 PETp1
20 PETn1
21 GND
22 GND
23 PETp2
24 PETn2
25 GND
26 GND
27 PETp3
28 PETn3
29 GND
30 RSVD
31 PRSNT2#
32 GND
One Stop Systems, Inc.
Rev. A
Description
N/C
N/C
N/C
Ground
N/C
N/C
Ground
3.3 V power
Host Mode: Not connected
Target Mode: Test Power On
3.3 V auxiliary power
N/C
Mechanical key
Reserved
Ground
Transmitter differential pair,
Lane 0
Ground
Hot-Plug presence detect
Ground
Transmitter differential pair,
Lane 1
Ground
Ground
Transmitter differential pair,
Lane 2
Ground
Ground
Transmitter differential pair,
Lane 3
Ground
Reserved
Hot-Plug presence detect
Ground
Side A
Name Description
PRSNT1# Hot-Plug presence detect
N/C N/C
N/C N/C
GND Ground
N/C Not connected
JTAG3 Host Mode:TDI (Test Data Input)
Target Mode: Test Clock+
JTAG4 Host Mode: TDO (Test Data Output)
Target Mode: Test Clock-
N/C Not connected
N/C Not connected
+3.3V 3.3 V power
PERST# Fundamental reset
GND Ground
REFCLK+
Reference clock (differential pair)
REFCLK
GND Ground
PERp0
Receiver differential pair, Lane 0
PERn0
GND Ground
RSVD Reserved
GND Ground
PERp1
Receiver differential pair, Lane 1
PERn1
GND Ground
GND Ground
PERp2
Receiver differential pair, Lane 2
PERn2
GND Ground
GND Ground
PERp3
Receiver differential pair, Lane 3
PERn3
GND Ground
RSVD Reserved
OSS-KIT-EXP-4500
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