Electrical computers and digital data processing systems: input/ – Access arbitrating
Patent
1997-11-05
1999-11-16
Sheikh, Ayaz R.
Electrical computers and digital data processing systems: input/
Access arbitrating
710128, 710120, 710112, 710113, G06F 1314
Patent
active
059875585
ABSTRACT:
A SCSI bus extender apparatus coupling a primary SCSI bus to a secondary SCSI bus includes a mechanism for detecting and resolving contention between a substantially simultaneous SELECTION operation on the primary bus and a RESELECTION operation on the secondary bus. The inventive method contemplates the bus extender arbitrating for control of the primary bus after a conflict is detected, and releasing control of the secondary bus if control of the primary bus is obtained. A target device on the secondary bus can then rearbitrate for control of the secondary bus. Once the target device controls the secondary bus, it can direct a RESELECTION signal to the bus extender, which responsively directs the signal to an initiator device on the primary bus. If the bus extender is unable to gain control of the primary bus after a conflict is detected, the SELECTION operation is allowed to proceed and the target device reattempts to assert the RESELECTION operation thereafter.
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Ham William
Lee Fee
Monia Charles
Digital Equipment Corporation
Kubida William J.
Kuta Christine M.
Phan Raymond N
Sheikh Ayaz R.
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