Patent
1995-07-14
1996-06-04
Ellis, Richard L.
395285, G06F 500, G06F 1342
Patent
active
055242367
ABSTRACT:
The disclosed invention is an apparatus in a computer peripheral device for determining the direction of signal flow and data flow on a SCSI bus, which apparatus comprises a time delay means responsive to status signals of the SCSI bus. The time delay means generates a signal that defines an arbitration selection period of time for determining control of the SCSI bus. The apparatus further includes a first circuit means responsive to the arbitration selection signal and status signals of the SCSI bus. The first circuit means generates a plurality of signals that determine whether the peripheral device is an initiator of signals to be transmitted on the bus or is a target for receipt of signals present on the bus. Moreover, the apparatus includes a second circuit means that is responsive to the plurality of signals generated by the first circuit means and status signals of the bus. The second circuit means generates a pair of signals indicative of the direction of data and signal flow on the SCSI bus.
REFERENCES:
patent: 4864291 (1989-09-01), Korpi
patent: 5204951 (1993-04-01), Keener et al.
patent: 5253348 (1993-10-01), Scalise
Axenfeld Robert R.
Ellis Richard L.
Richebourg J. Ronald
Starr Mark T.
Unisys Corporation
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