SCSI bus extension system for controlling individual arbitration

Details SCSI bus extension system for controlling individual arbitration SCSI bus extension system for controlling individual arbitration

1993-06-15

1996-06-18

Ray, Gopal C.

Multiplex communications

Wide area network

Packet switching

39520006, 370 852, 370 854, 364240, 3642402, 3642426, 36424292, 364DIG1, G06F 1336

Patent

active

055287654

ABSTRACT:
This digital communication method and system permits extended distance communication on a SCSI bus despite the time constraints imposed on certain bus operations such as arbitration. The bus system is comprised of discrete bus segments each having a portal node and one or more devices interfaced thereon. All nodes are connected together by a serial link. Each node seizes control of its bus segment and imposes a pseudo-busy condition to prevent bus operations such as arbitration. A token message passed over the serial link between nodes allows one node at a time to release control of its segment to permit arbitration among the devices interfaced on its segment. A source device on the released segment that gains control of the segment as a result of arbitration may communicate with a destination device anywhere on the bus system.

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