A.5
Front panel I/O header
There is a 20-pin header, 10×2, on the N1 board near the front panel. The header provides connectivity
for LEDs and switches between the front panel and the board.
Some signals are not brought out to the front panel but are available on the header but are available for
use at the connector. The following table shows the pin mapping of the front panel I/O header.
Table A-9 Front panel I/O header pin mapping
Pin Polarity Pin Polarity Description
1
+
2
-
Connects PBON button on board to PBON button on front panel.
3
+
4
-
Connects PBRESET button on board to PBRESET button on front panel.
5
+
6
-
Reserved
7
-
8
+
Connects to orange LED in 4-level light pipe, fourth from bottom, on back panel.
Denotes MCC USB activity.
These pins are not brought out to the front panel.
9
-
10
+
Connects to green LED in 4-level light pipe, third from bottom, on back panel.
Denotes MCC USB activity.
These pins are not brought out to the front panel.
11
-
12
+
Power LED embedded in PBON button on front panel.
13
-
14
+
HDD activity LED on front panel. This signal is a combined signal from SATA0 and SATA1.
15
-
16
+
Connects to the GbE activity LED embedded in the GbE connector and denotes GbE traffic.
These pins are not brought out to the front panel.
17
-
18
+
Connects to blue LED in 4-level light pipe, first from bottom.
Denotes UID activity.
These pins are not brought out to the front panel.
19
N/A
20
N/A
No connection
Related information
1.3 The N1 SDP at a glance
A Signal descriptions
A.5 Front panel I/O header
101489_0000_02_en
Copyright © 2019, 2020 Arm Limited or its affiliates. All rights
reserved.
Appx-A-235
Non-Confidential - Beta