Circuit with switch controller that signals switch control input

Details Circuit with switch controller that signals switch control input Circuit with switch controller that signals switch control input

1995-06-07

1999-02-23

Lee, Thomas C.

Multiplex communications

Wide area network

Packet switching

395309, 395311, 395500, 370362, 370360, G06F 1314

Patent

active

058753532

ABSTRACT:
A protocol and associated circuitry operable for efficiently extending serial bus capability in system environments is disclosed. 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 disclosed.

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patent: 5548781 (1996-08-01), Huang

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