公开(公告)号：JPH10207833A

公开(公告)日：1998-08-07

申请号：JP26538397

申请日：1997-09-30

Applicant: SYMBIOS LOGIC INC

Inventor： ROBERT A DEAMOSS

IPC: G06F12/00 ,  G06F13/00 ,  G06F13/372 ,  G06F17/30 ,  H04L12/40

Abstract: PROBLEM TO BE SOLVED: To improve unfairness of arbitration by a SCSI bus allocating device. SOLUTION: Respective devices 106 which require arbitration on a SCSI bus 104 before trying the SCSI bus arbitration select one of time slots at pseudo- random. Then a delay is made for a relative time before the SCSI bus arbitration is started. If a device senses reuse of the SCSI bus at arbitrary time before the delay cycle ends, the device lose the right to be arbitrated. A 2nd device having already selected the time slot with the shortest delay cycle acquires control over the SCSI bus before the 1st device tries the arbitration. The time slots are selected according to the probability that the respective slots relate to. To allocate the probability to respective slots used by SCSIs, the probability is allocated to, for example, up to seven devices which share four time slots.