Priority selection circuit for multiported central functional un

Details Priority selection circuit for multiported central functional un Priority selection circuit for multiported central functional un

1976-10-29

1978-12-19

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 304, G06F 918

Patent

active

041308646

ABSTRACT:
A data processing system includes a shared functional unit having access and egress through a plurality of communication channels to several data handling units. The communication channels are multiplexed under control of a priority selection circuit normally arranged as a ladder from highest to lowest priority. Request signals for the various channels are each passed through a respective gate conditioned by a request enable device which is susceptible of being disabled whenever a select signal for that particular channel has been caused to serve the associated handling unit while channels of lower priority have request signals still demanding selection. When the request signal of lowest order at the time has been served, all request enable devices are reset in order to return to full priority selection.

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