Browse Prior Art Database

SCSI Multiple Initiator

IP.com Disclosure Number: IPCOM000109808D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 3 page(s) / 81K

Publishing Venue

IBM

Related People

Ishibashi, K: AUTHOR [+3]

Abstract

Disclosed is a SCSI multiple initiator control circuit for an SCSI target device. The SCSI device has a capability to support multiple initiators. This means a target SCSI device must support various data transfer rates and offset for each initiator. Normally this information is set by an MPU every time an initiator selects a target or when a target reselects an initiator.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 54% of the total text.

SCSI Multiple Initiator

       Disclosed is a SCSI multiple initiator control circuit
for an SCSI target device.  The SCSI device has a capability to
support multiple initiators.  This means a target SCSI device must
support various data transfer rates and offset for each initiator.
Normally this information is set by an MPU every time an initiator
selects a target or when a target reselects an initiator.

      This circuit sets the initiator's information about the data
transfer rate and offset for each initiator ID and selects that
information automatically.  This has the effect of improving
performance without MPU handling.

      The characteristics of this invention are as follows:
      -  It has 8 sets of the initiator information register to keep
the initiator's information for data transfer rate and offset for
each initiator (ID = 0-7).
      -  It has a current initiator's ID register which is set when
an initiator selects a target.
      -  It has a reselection initiator's ID register which is set by
MPU when a target reselects an initiator.
      -  When data transfer after selection is accomplished, the
current initiator's ID register selects the initiator information
register which has the same ID, and the content of that register is
used for data transfer.
      - When data transfer occurs after reselection, then the
reselection initiator's ID register selects the initiator information
register which has the same...