Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
plugged into the bus (child devices). OSPM will track the state of all devices on the bus and will put
the bus into the best possible power state based on the current device requirements on that bus. For
example, if the PC Card cards are all in the D1 state, OSPM will put the PC Card controller in the D1
state.
Present
State
Next
State
Cause
D2/D3 D0 Any card in any slot needing to transition to state D0 due to a wake event or because of
system usage.
D0 D1 No card in any slot is in state D0.
D0 D2 No card in any slot is in state D0 or D1.
D0 D3 All cards in all slots are in state D3.
A.10.3 Wake Events
A wake event is any event that would normally assert the controller’s status change interrupt (for
example, card insertion, card battery state change, card ReqAttn event, and so on) or ring-indicate
signal.
A.10.4 Minimum Power Capabilities
A PC Card controller device conforming to this specification must support the D0 and D3
states. Support for the D1 or D2 states is optional.
A.11 Storage Device Class
The requirements expressed in this section apply to ATA hard disks, floppy disks, ATAPI and SCSI
CD-ROMs, and the IDE channel.
962 April, 2015 Version 6.0