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Diagnostic subsystem and method for SCSI Interface

  • US 5,796,938 A
  • Filed: 12/11/1996
  • Issued: 08/18/1998
  • Est. Priority Date: 12/11/1996
  • Status: Expired due to Fees
First Claim
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1. A diagnostic subsystem for use with a Small Computer System Interface (SCSI), said interface having a plurality of lines connecting an initiator system and a target system, said diagnostic subsystem comprising:

  • a set of line drivers for providing a range of signals, said set of line drivers comprising a pair of line drivers for each line of, respectively, the initiator and target systems;

    a set of switches for selectively connecting said initiator system and said target system to each other or to said line drivers, said set of switches comprising a pair of switches for, respectively, the initiator and target systems;

    a set of sense lines connected to said initiator system and to said target system, said set of sense lines comprising a pair of sense lines connected to each line of, respectively, the initiator and target systems; and

    a controller for selectively operating selected ones of said switches to disconnect said initiator and said target systems and connect selected ones of said line drivers at selected lines of said Interface, operating said selected line drivers to selectively provide selected signals within said range to said Interface, said controller selectively operating said selected ones of said switches and operating said selected line drivers upon sensing a selected phase of operation of said Interface at said sense lines, and said controller selectively operating said selected switches and said selected line drivers upon sensing said selected phase of operation and upon a generation of request signal by one of said initiator or target systems at said Interface a selected number of times.

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