Kontron AT8902M - Manual (Page 80)

AT8902M Software Description
Page 4 - 15 AT8902M User Guide
4.4.5 LEDs
For LED positions on the front plate refer to Chapter 3, section 3.1.11., Display Elements.
4.4.5.1 Hot Swap LED (Blue LED)
The AT8902M Hub Board supports a blue Hot Swap LED mounted on the front panel. This LED
indicates when it is safe to remove the Hub from the chassis. The on-board IPMC drives this
LED to indicate the hot swap state. The following states are possible:
4.4.5.2 Out-Of-Service (OOS) LED (ATCA LED1)
The AT8902M supports a red Out of Service LED mounted on the front panel. The position of
this LED is near the top handle besides the blue Hot Swap led. The on-board FWUM or the
IPMC can drive this LED to indicate the service state of the IPMC. The OEM application can
also drive this LED using the PICMG LED control APIs. The following states are possible:
Other application defined LED usage may be implemented.
The AT8902M AMC.0 carrier also implements the OOS LED “Short blink” mode for its Ad-
vancedMC mates on detection of “power denied” conditions.
As per AMC.0, if the AMC current draw requirements exceed AMC.0 carrier power budget, the
AT8902M will keep the AMC in M1 state with the blue Hot Swap LED in the ON state.
Table 4-5: LED state
LED state Description
OFF Board is in M4 state, normal state when board is in operation.
ON Ready for hot swap
Short blink Board is in M5 state. Deactivation in progress
Long blink Activation in progress.
Table 4-6: OOS LED state
LED state Description
ON Out of service condition, the IPMC is hold in reset
OFF Normal/Idle board is in service, unless blue led is on
Blink (50/50) The FUM is programming the IPMC due to a firmware update or a rollback
Short blink Power denied condition detected:
Payload has been left in M3 state for more than 30 secs or SetPowerLevel
‘0‘ has been received while in M2 or M3 state
LED state Description
Short blink Power denied condition detected:
AMC current draw requirements exceed carrier power budget or SetPower-
Level ‘0‘ has been received while in M2 or M3 state