PC4-PRESTO • CompactPCI
®
PlusIO • 4
th
Generation Intel
®
Core™-4xxx Processor
Hot Swap Detection
The CompactPCI
®
specification added the signal ENUM# to the PCI bus to allow board hot swapping.
This signal is routed to a GPIO (GPIO3 QM87 PCH) . An interrupt can be requested, if ENUM#
changes, caused by insertion or removal of a peripheral board.
Note that the PC4-PRESTO itself is not a hot swap device, because it makes no sense to remove the
system controller from a CompactPCI
®
system. However, it is capable to recognize the hot swap of
peripheral boards and to start software that is performing any necessary system reconfiguration.
Power Supply Status (PWR_FAIL#)
Power supply failures may be detected before the system crashes down by monitoring the signals
DEG# or FAL#. These active low lines are additions to the CompactPCI
®
specification and may be
driven by the power supply. DEG# signals the degrading of the supply voltages, FAL# there possible
failure. On the PC4-PRESTO DEG# is tied to VCC and FAL# is routed to QM87 PCH GPIO4.
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