76 SBC329 3U VPX Single Board Computer
Publication No. SBC329-HRM/1
5.20.5
POST Code LEDs (DS414 to DS421)
These yellow LEDs reflect the value of the most recent port 80 write cycle where
DS414 = bit 0 of the PORT80 register and DS421 = bit 7. BIOS Power On Self-Test
(POST) writes values to PORT80 as it progresses through its tests, so the LEDs
indicate the most recent POST status (known as the POST code). This can be useful
when diagnosing a board that fails to boot.
Contact Abaco for more information on decoding the POST code LEDs.
5.20.6
Ethernet Link Status LEDs (DS422 and DS432 to DS436)
Each Ethernet port has
two yellow LEDs to show the link status and activity. The
function of these LEDs is determined by the Ethernet controller’s EEPROM
settings,
or can be overwritten by software. The default values are shown below:
Table 5-25 Ethernet Link Status LED Meanings
LED
Channel Type
Meaning When Lit
Meaning When Off
Meaning When Flashing
DS432
ETH0
BASE-T
Link is present
No link
Activity
DS422
Speed = 1000 Mbps Speed = 10/100 Mbps or no link -
DS436
ETH2
BASE-T or
BASE-BX
Link is present
No link
Activity
DS435
Speed = 1000 Mbps Speed = 10/100 Mbps or no link -
DS434
ETH1
BASE-BX
Link is present
No link
Activity
DS433
Speed = 1000 Mbps No link
-
5.20.7
SATA Activity LED (DS429)
This green LED, when lit, shows that there is SATA activity on any port, including
the port connected to the on-board SSD.
5.20.8
Board Power Good LED (DS430)
The Power Manager drives this green LED. When lit, it indicates that all backplane
and on-board power supplies are within tolerance. If the LED is flashing, it means
that one or more supply has been on within tolerance, but has subsequently failed.
For example, a brown-out condition on one of the supplies would cause the LED to
flash.
5.20.9
Sleep Status LED (DS431)
This yellow LED illuminates when the SBC329 is in one of the S3, S4 or S5 sleep
states.
5.20.10
BMM Status LED (DS438)
This yellow LED is controlled exclusively by the BMM. See the relevant software
manual for more information.