COMPUTERSYSTEM HAVING APPARATUS FOR IMPROVING THE COMMUNICATION EFFICIENCY BETWEEN A HOST PROCESSOR AND PHERIPHERAL DEVICES CONNECTED BY AN SCSI BUS

COMPUTERSYSTEM HAVING APPARATUS FOR IMPROVING THE COMMUNICATION EFFICIENCY BETWEEN A HOST PROCESSOR AND PHERIPHERAL DEVICES CONNECTED BY AN SCSI BUS

Apparatus and method for increasing efficiency of command execution from a host processor (11) over an SCSI bus (14). Arbitration, selection and message out functions of SCSI protocol are implemented using a background arbitration state machine (32). Additional protocol functions are implemented in...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: MCNEILL, ANDREW BOYCE, WACHTEL, EDWARD IRVING, KEENER, DON STEVEN
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Beschreibung
Zusammenfassung:Apparatus and method for increasing efficiency of command execution from a host processor (11) over an SCSI bus (14). Arbitration, selection and message out functions of SCSI protocol are implemented using a background arbitration state machine (32). Additional protocol functions are implemented in a foreground state machine (26). When the host processor (11) issues a command for access to the SCSI bus (14), the background state machine (32) can be programmed before the foreground machine (26) completes the protocol function for a previous command. Thus, the background state machine (32) is ready to arbitrate for access to the bus (14) at the very next bus free condition.