Adaptec 1742A, AHA-1740A, 1744 Asynchronous Event Notification, AT Bus, Bus Device Reset, Byte

adaptec AHA-1740A/1742A/1744

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.

GL-2