Adaptec AHA-1740A User Manual
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rate and independence of external timing constraints, including
cable length and circuit response times.
Asynchronous Event Notification
A process by which a target can send unsolicited sense informa-
tion to an initiator using the
Send
command in order to inform
the initiator about the occurrence of an important unusual
occurrence.
AT Bus
The Industry Standard Architecture bus.
Bus Device Reset
A SCSI message that clears all activity in the target to which it is
addressed.
Byte
An eight-bit unit of data. An octet. A byte is normally the small-
est addressable unit of a memory and the unit of transfer on the
SCSI bus.
CCB
See Command Control Block
CCS
See Common Command Set
CDB
See Command Descriptor Block
Command Control Block
A software object prepared by the host microcomputer software
for the host adapter to provide it all the control information it
needs to execute a SCSI command. Abbreviated CCB.
Command Descriptor Block
A block of information passed across the SCSI bus to provide the
command, parameter, and address information necessary for the
target to execute the desired functions. Prepared by the host soft-
ware and placed in the CCB to be passed to the target by the host
adapter. Abbreviated CDB.
adaptec
AHA-1740A/1742A/1744
GL-2