Port 80 And Leds; Port 80 Display; Led Indicators - ADLINK Technology COM Express DB30 x86 User Manual

DB30 x86 User's Guide

5. Port 80 and LEDs

This section describes the hexadecimal display and LED functionality

5.1 Port 80 Display

During power-up and BIOS execution, the CPU will first retrieve commands from POST and then execute them. Each command has a corresponding
debug port data code or BIOS POST checkpoint code. The results from each checkpoint can be reviewed on the LED display so the technician or
administrator can properly debug the system. The POST code is written on I/O port 80 hex
The POST code is shown on the two 7-segment LED displays on the debug board
The Port 80 decoding interface is dependent on module design.

5.2 LED Indicators

LED Function
CB_RESET# LED will lit on active rest signal for carrier board
CB_PWROK LED will lit on active power OK from COM Express module
SLP_S3# LED will lit on released SUS_S3# signal from COM Express module
SLP_S4# LED will lit on released SUS_S4# signal from COM Express module
SLP_S5# LED will lit on released SUS_S5# signal from COM Express module
EC_STATUS LED will show the status of the BMC on the COM Express module
PWR_BTN# LED will lit on active power button signal for COM Express module
SYS_RESET# LED will lit on active reset signal for COM Express module
Page 5 copyright © 2023 ADLINK Technology Inc.
PICMG COM.0 R3.0