Importance

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Abstract

In a parallel SCSI host adapter integrated circuit, a hardware circuit includes a SCSI bus request terminal, a SCSI bus attention terminal, and an automatic SCSI bus attention management circuit. The automatic SCSI bus attention circuit includes an automatic SCSI bus attention assertion hardware circuit coupled to the SCSI bus attention terminal and an automatic SCSI bus attention de-assertion hardware circuit coupled to the SCSI bus attention terminal and to the SCSI bus request terminal. Upon pending initiation of a selection phase, the automatic SCSI bus attention assertion circuit asserts an active signal on the SCSI bus attention terminal. Following assertion of the active signal on the SCSI bus attention terminal, the automatic SCSI bus attention de-assertion hardware circuit counts the number of active SCSI bus request signals received from the SCSI bus request terminal. Upon the automatic SCSI bus attention management circuit receiving a terminal count of active request signals from the SCSI bus request terminal, the automatic SCSI bus attention hardware circuit automatically de-asserts the active signal on the SCSI bus attention terminal.

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First Claim