Fault tolerant three port communications module

Details Fault tolerant three port communications module Fault tolerant three port communications module

1992-08-27

1994-05-10

Beausoliel, Jr., Robert W.

Excavating

H04L 108

Patent

active

053115244

ABSTRACT:
A fault tolerant three port communications module has two control ports for receiving commands from two computers, and a communications port for transferring data over a communications channel in response to the commands. Each control port includes a select line which carries a select signal with true and false states, mode lines which carry codes that represent the commands, and a write line which carries a respective pulse in sync with each of the codes. The select line, mode lines, and write line of each control port are coupled in the module to a respective inter-processor command decoder having a lead stage and a trail stage. The lead stage detects when a predetermined code occurs on the mode lines and the select signal is false during a first one of the pulses; and, the trail stage generates an output signal that indicates the receipt of an inter-processor command for the module if, during a second pulse that immediately follows the first pulse, the compliment of the predetermined code occurs on the mode lines and the select line is true.

REFERENCES:
patent: 3961203 (1976-06-01), Hutch
patent: 4308579 (1981-12-01), Dlugos
patent: 4434499 (1984-02-01), Motsch et al.
patent: 4866609 (1989-09-01), Calta et al.

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