Priority control method and apparatus for common bus of data pro

Details Priority control method and apparatus for common bus of data pro Priority control method and apparatus for common bus of data pro

1983-11-08

1985-10-15

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 300

Patent

active

045478503

ABSTRACT:
In a system of the type in which processing units and terminal devices are connected to a common bus so that messages can be transmitted and received between these units and devices via the bus, the processing units and the terminal devices are connected to the common bus by node processors. A bus control method, the so-called "contention system", is adopted in which the first node processor starting a transmission of a message from the node processor to the common bus is given the right to transmit the message when a plurality of node processors have transmission messages to send. When transmissions are simultaneously started by two or more node processors, they are inhibited, and the messages to be transmitted are assigned priorities and are retransmitted by the corresponding node processors after the lapse of waiting times of different values which are set in advance in accordance with the priorities.

REFERENCES:
patent: 4096571 (1978-06-01), VanderMey

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