The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 1984
Filed:
Nov. 04, 1981
Abstract
A system for the exchange of messages among a multiplicity of processing units includes a data channel and a service line interconnecting respective interfaces of these units. Each interface includes a busy-state detector determining during a test phase of a recurrent time slot whether the service line is available, a logic network connectable in a subsequent acquisition phase the service line in the event of its availability to emit successive bits of an address characterizing the respective processing unit, and a comparator determining during the aquisition phase whether an emitted address bit of a particular logic level ('1') coincides with another bit of a higher-priority level ('0') concurrently sent over the line by some other unit. If a higher-priority address bit is encountered, the emission of the address is aborted and restarted in a subsequent time slot. If there is no conflict, an outgoing message is delivered to the data channel by way of a concurrently enabled driver; should that message require more than one time slot for its transmission, the service line is seized by the emission of a busy bit in the test phases of one or more subsequent time slots preceding the last time slot occupied by that message.