Quarch Technology Torridon HS Technical Manual page 22

Torridon HS Lite Drive Control Module - Technical Manual
is the master control for all switches on the card. The same action can be performed by
writing this bit directly.
The command will fail if you order a power up when the module is already in the
connected state and vice-versa as the action cannot be performed.
The "OK" response will be returned as soon as the hot-swap event has begun. If your
timing sequence is very long you may have to poll the BUSY bit in register 0 to check
when it has completed.
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