Data processing system bus for multiple independent users

Details Data processing system bus for multiple independent users Data processing system bus for multiple independent users

1981-11-03

1984-05-29

Chan, Eddie P.

Boots, shoes, and leggings

370 85, G06F 304, G06F 1516, G06F 946

Patent

active

044518811

ABSTRACT:
A new bus permits processing elements (PE's) to communicate with other PE's entirely under the control of each PE without a separate bus controller. Each PE has means for broadcasting its priority code on a contention portion of the bus and for sampling the bus after a delay in which it has received the codes from other PE's. Each PE holds its priority code on the bus for a further delay during which other PE's can sample the priority code. The PE's resolve contention for access to the information portion of the bus in a multi stage contention sequence. System usage, made possible by peer-to-peer distribution of bus access control, includes dynamic driven priority schemes, a variety of operating modes and hence flexible multiplexing of message traffic.

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patent: 4320457 (1982-03-01), Tanikawa
"Multiprocessing with Single Board Computers-Hardware Consideration", Western Conf. Record., Sep. 18th-20th 1979, San Francisco, pp. 1-6.

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