cisc(7)                    DG/UX 4.30                     cisc(7)



     NAME
          cisc - AViiON family SCSI adapter subsystem

     DESCRIPTION
          The cisc SCSI (Small Computer System Interface) adapter
          subsystem consists of an intelligent SCSI adapter controller
          which links the host system VME bus to a SCSI bus.  Cisc is
          the SCSI interface used in the AViiON 5000/6000 servers.

          Devices on the SCSI bus are accessed through the SCSI
          adapter. As a result, the SCSI adapter name must be included
          in a SCSI device specification.  A cisc SCSI adapter is
          specified in the form:

              cisc@n(addr)

          where n is the hexadecimal device code of the controller,
          and addr is the control space starting address for the
          controller.

          The cisc adapter subsystem attempts to use the SCSI
          synchronous data transfer protocol by negotiating a
          synchronous offset with each device on the the SCSI bus.  If
          this negotiation step fails, the asynchronous mode is used.

          Note that a cisc controller firmware revision level of 11 or
          greater is required to support the synchronous SCSI
          protocol.  If the controller is found to have an earlier
          firmware revision, an informational message is logged to the
          system console at system boot time, and the asynchronous
          mode is selected.

     SEE ALSO
          sd(7), st(7).





















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