Hot Swap: Hot Swap LED and Ejector Switch Control
10006024-04 Katana®752i User’s Manual 12-3
The Hot Swap logic functions as follows when a board is removed from a slot:
1The operator opens the board’s ejector handles and the PCI0_HS signals goes low to
indicate that the board is about to be extracted.
2The REM bit is set, and the PCI0_ENUMn pin is asserted, if not masked by the EIM bit.
3System Hot Swap software detects PCI0_ENUMn assertion and checks the REM bits in all
Hot Swap-compliant boards. It identifies the board to be extracted and clears the REM bit
(by writing a value of one).
4The MV64460 system controller acknowledges the system software by stopping the
assertion of the PCI0_ENUMn pin.
5The Hot Swap software may reconfigure the rest of the boards. When ready, it sets the LOO
bit to indicate that the board can be removed.
6The MV64460 system controller drives PCI0_LED pin to one, and the Hot Swap LED turns on
to indicate to the operator that the board can be removed.