Data communication bus structure

Details Data communication bus structure Data communication bus structure

1976-10-04

1978-04-18

Thomas, James D.

Boots, shoes, and leggings

340147R, H04Q 358, H04Q 130, G06F 100

Patent

active

040854485

ABSTRACT:
A data communication bus structure where all module-to-module control information is grouped into two sets of lines, defined as sub-buses, wherein signal contents of the sub-buses change only at well-defined times, under the control of two other lines which themselves simply govern the transfer of control information relative to the communication. The bus structure is symmetrical with one type of each line driven by each of the two modules involved in the communication. Arbitrary standard error detecting/correcting encodings may be used on the bus to overcome possible bus failures with no change to the basic bus communications protocol.
An independent bus monitor observes all communications over the bus, observes when an improper signaling exchange takes place, and isolates the module most responsible for the fault. Also, there is provided a simple and standard programmable interface unit which can be used to generate the appropriate control information and signaling protocol for a module that is to be tied to the bus.

REFERENCES:
patent: 3517171 (1970-06-01), Avizienis
patent: 3585595 (1971-06-01), Slavin
patent: 3681761 (1972-08-01), Schuenemann
patent: 3710324 (1973-01-01), Cohen
patent: 3916177 (1975-10-01), Greenwald
patent: 3921141 (1975-11-01), Wilber
patent: 3932841 (1976-01-01), Deerfield
patent: 3943494 (1976-03-01), Holmes, Jr.
patent: 3978451 (1976-08-01), Ito
patent: 3988714 (1976-10-01), Bardotti

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