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:
Jul. 22, 1986
Filed:
Jul. 28, 1983
William P LaViolette, Austin, TX (US);
David S Mothersole, Austin, TX (US);
John Zolnowsky, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A bus master is provided with the capability to accept a data transfer task from a CPU, which includes the performance of a predetermined sequence of data transfer operations between memory and a selected peripheral controlled by a respective controller. During any one of the operations, the bus master may be requested to relinquish the bus so that a higher priority transfer may occur or a deadlock condition resolved. In response to such request, the bus master immediately terminates the current bus cycle, but remembers the state thereof at the time of relinquishment. After the high priority transfer is completed, the bus master may be allowed to rearbitrate for use of the bus. Upon again obtaining control of the bus, the bus master restarts the bus cycle which was prematurely terminated and continues the sequence of operations as if no relinquishment had occurred.