Addressable shadow port and protocol for serial bus networks

Details Addressable shadow port and protocol for serial bus networks Addressable shadow port and protocol for serial bus networks

1995-04-24

1996-01-09

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 851, 324 731, 364489, 371 221, 371 223, 34082552, G01R 3128

Patent

active

054835186

ABSTRACT:
A protocol and associated circuitry operable for efficiently extending serial bus capability in system environments is described. The protocol is designed to coexist and be fully compatible with existing serial bus approaches, and in particular an example of application of the invention to a backplane system utilizing the 1149.1 IEEE standard serial bus is detailed. The circuitry and protocol required to couple any one of the boards on the backplane to the serial bus master without modifying the existing serial bus protocol, without adding additional signals, and without affecting the throughput rate of the serial bus is described. The invention advantageously allows the serial bus master to select, communicate with, and deselect backplane boards so that high level test functions may be simultaneously executed and monitored. Additional preferred embodiments are also described.

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