User`s manual

General Description of the SCSI Software
SBCSCSI/D1 1-5
1
SIOP Firmware
The SIOP Firmware provides these unique features and facilities:
❏ Handles all aspects of SCSI protocol conformance.
❏ No firmware intelligence is imposed on the command requests issued to
peripherals.
❏ Internally enqueues all command requests, in a linked list, until they can
be dispatched to the SCSI bus; therefore, an unlimited number of
command requests can be issued to the Firmware before status for any of
them is received by the user.
❏ Executes in either polled mode or interrupt mode. Polled mode operates
without interrupts and returns from a command after the command
completes.
❏
Provides Target level access ( AVAILABLE ONLY IN A FUTURE
RELEASE ).
❏ The SIOP executes independently of the Motorola Processor thus reducing
the MPU overhead associated with SCSI accesses.