Kontron AM4530 - Manual (Page 24)

11 AM453x
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2.6.7.2 Hot-Swap LED
The AM453x supports a blue Hot Swap LED mounted on the front panel. This LED indicates when it is safe to
remove the AMC from the AMC Carrier. The on-board MMC drives this LED to indicate the hot-swap state. The
following states are possible:
Table 2-2: Hot-Swap LED Description
When the AMC latch is disengaged from the faceplate, the hot swap switch embedded in the PCB will assert a
"HOT_SWAP_PB#" signal to the MMC, and the MMC will send Module Handle Open" event message to the
AMC Carrier which move from the M4 state to the M5 state. At the M5 state, the AMC Carrier will ask the SHMC
(or Shelf Manager) for permission to move the AMC to the M6 state. Then the Carrier AMC will set the AMC Hot
Swap LED to indicate this state with a short blink. Once permission is received from the SHMC or higher-level
software, the AMC carrier 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 AMC
Carrier will return the Hot Swap LED to a solid off condition, indicating that the AMC has returned to M4
state.
If the AMC Carrier reaches the M6 state, through an extraction request through the AMC handle latch, the
MMC communicates to the AMC Carrier that the module must discontinue operation in preparation for
removal. The Hot Swap LED continues to flash during this preparation time, just like it does at the M5 state.
When main AMC payload power is successfully removed from the AMC Bay, the Hot Swap LED remains lit,
indicating it is safe to remove the AMC from the AMC Carrier.
Table 2-3: Hot-Swap LED Meaning
LED state Description
OFF AMC is in M4 state, normal state when board is in operation.
ON Ready for hot swap.
Short blink M5 state deactivation request
Long blink M2 state activation request.
LED Status Meaning
Off Normal status
Blinking Blue
Preparing for removal/insertion: Long blink indicates activation is in progress, short blink when
deactivation is in progress.
Solid Blue Ready for hot swap