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:
Aug. 20, 1996
Filed:
Apr. 06, 1994
Nader Amini, Boca Raton, FL (US);
Bechara F Boury, Boca Raton, FL (US);
Sherwood Brannon, Boca Raton, FL (US);
Ian A Concilio, Boca Raton, FL (US);
Richard G Hofmann, Boca Raton, FL (US);
Terence J Lohman, Boca Raton, FL (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A DMA controller is provided for transferring data between source and destination devices over an I/O bus. The DMA control circuit includes a bus interface unit for providing a bus size information at the beginning of each consecutive bus cycle and a look ahead responsive to the bus size information for providing a bus size control signal. A DMA control circuit responsive to the bus size control signal controls the bus width during contiguous transfer cycles. By dynamically adjusting the DMA control circuit, back to back data reads and writes may occur with no wait states inserted for generating the terminal count information.