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:
Dec. 07, 1993
Filed:
Apr. 08, 1992
Applicant:
Inventors:
William F Dohse, Plymouth, MN (US);
Ronald J Larson, Minneapolis, MN (US);
Richard Mansfield, Bloomington, MN (US);
Assignee:
Micral, Inc., New Brighton, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
395325 ; 364D / ; 36424231 ; 3642329 ; 36424691 ; 36424221 ; 395500 ;
Abstract
A microprocessor access arbitration network which arbitrates among HOLD, RESET and REFRESH request commands by controlling a preempt bus so that a system memory refresh cycle is never delayed by a DMA or bus master operation is described. If a HOLD request is in progress for an operation other than a REFRESH cycle when a REFRESH cycle is initiated, that HOLD request is delayed while the REFRESH cycle proceeds to completion.