Kontron AT8404 - Manual (Page 97)

Software Description
84 AT8404 User Guide
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4.3.6.3 Health LED (ATCA LED2)
Green/Amber LED
4.3.6.4 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.
4.3.7 Hot Swap Process
The AT8404 Carrier Board has the ability to be hot-swapped in and out of a chassis. The onboard IPMC man-
ages the power-up and power-down transitions.
In addition to captive retaining screws, the AT8404 Carrier 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 Carrier Board has returned to M4 state.
If the Carrier 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 successfully turned off, the Hot Swap
LED remains lit, indicating it is safe to remove the AT8404 from the chassis.
Table 4-22: Health LED state
LED state Description
ON (green) None of the health sensors is asserted
ON (amber) At least one health sensor is asserted
OFF Payload is not activated