Kontron AT8902M - Manual (Page 81)

AT8902M Software Description
Page 4 - 16 AT8902M User Guide
4.4.5.3 Health LED (ATCA LED2)
Green LED
4.4.5.4 Customer Definable LED (ATCA LED 3)
This is an amber LED which can be used by a customer application. This LED can be controlled
by PICMG 3.0 defined LED commands.
4.4.6 Hot Swap Process
The AT8902M Hub Board has the ability to be hot-swapped in and out of a chassis. The on-
board IPMC manages the power-up and power-down transitions.
In addition to captive retaining screws, the Hub Board has two ejector mechanisms to provide
a positive cam action; this ensures the blade is properly seated. The bottom ejector handle also
has a switch that is connected to the IPMC to determine if the board has been properly inserted.
When the lower ejector handle is disengaged from the faceplate, the hot swap switch will assert
a signal to the IPMC, and the IPMC will move from the M4 state to the M5 state. At the M5 state,
the IPMC will ask the ShMC for permission to move to the M6 state. The Hot Swap LED will
indicate this state with a short blink. Once permission is received from the ShMC or higher-level
software, the board will move to the M6 state.
The ShMC or higher level software can reject the request to move to the M6 state. If this occurs,
the Hot Swap LED returns to a solid off condition, indicating that the Hub Board has returned
to M4 state.
If the Hub Board reaches the M6 state, either through an extraction request through the lower
ejector handle or a direct command from higher-level software. The Hot Swap LED continues
to flash during this preparation time, just like it does in M5 state. When payload power is suc-
cessfully turned off, the Hot Swap LED remains lit, indicating it is safe to remove the Hub board
from the chassis.
Table 4-7: Health LED state
LED state Description
ON None of the health sensors is asserted
Blinking At least one health sensor is asserted