Functional Description
MEN Mikro Elektronik GmbH
52
20G020-00 E5 – 2014-01-21
2.14
Reset Button
The G20 is equipped with a reset button which is recessed within the front panel and
requires a tool, e.g. paper clip to be pressed, preventing the button from being
inadvertently activated.
2.15
Status LEDs
The G20 provides four status LEDs at the front panel which are controlled by the
board controller using SMBus commands.
Table 16.
Status LEDs
2.15.1
Status LED
The yellow status LED shows board status messages. The LED is controlled by a
GPIO pin of the board controller. It is switched on when the BIOS starts, switched
off when the board is switched off and flashing when the board is in stand-by (S3)
status.
During normal operation the LED can be switched on and off using the MEN driver
for the board controller. See MEN’s
website
for further information.
In case of a board failure, the LED displays the following error messages:
Table 17.
Error codes signaled by board management controller via LED flashes
LED No.
Color
Name
1
Board Status LED
2
Hotswap LED
3
User LED
4
User LED
Number of
Flashes
Error
1
+V3.3A failure
2
Input voltage failure
3
External power supply failure
4
CPU too hot
5
BIOS timeout
>5
Internal Board Error
