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. 05, 1989
Filed:
Dec. 07, 1987
Edmund A Reese, Portland, OR (US);
VLSI Technology, Inc., San Jose, CA (US);
Abstract
An improvement to an arbitration circuit in a dual port memory circuit device is disclosed. The arbitration circuit resolves near simultaneous identical address requests on the two ports. The arbitration circuit has a first state where the identical address request is resolved by permitting address requests to the first address port and denying writing of data to the second port and a second state where the identical address request is resolved by permitting address requests to the second address port and denying writing of data to the first port. The arbitration circuit also has a meta-state where the arbitration circuit is unable to resolve the identical address request. The improvement of the present invention detects the arbitration circuit in the meta-state and forcing the arbitration circuit into the first state in response to the detection of the meta-state.