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:
Mar. 08, 1994
Filed:
Dec. 28, 1990
Applicant:
Inventors:
Wan L Leung, Coral Springs, FL (US);
Richard A Kelley, Coral Springs, FL (US);
Leslie F McDermott, Lake Worth, FL (US);
Assignee:
International Business Machines Corp., Armonk, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
395275 ; 395325 ; 395425 ; 364D / ; 364D / ;
Abstract
A local processor is connected to one port of a dual port memory controller. A bus having a BURST signal line is connected to the other port. The memory controller controls access to a local memory. A remote processor can perform a semaphore operation on a semaphore stored in the local memory by translating a LOCK signal from the remote processor into a bus BURST signal that is activated for a period allowing the remote processor to read and modify the semaphore. While the semaphore operation is being performed, the local processor can access the local memory.