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:
May. 05, 1992
Filed:
Jan. 16, 1990
Applicant:
Inventors:
Yusuke Takeuchi, Ohme, JP;
Sakae Miki, Komae, JP;
Assignee:
Hitachi Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
395425 ; 364D / ; 364D / ; 3649236 ; 3649261 ; 3649269 ; 36492692 ; 36492792 ; 36492793 ; 36492794 ; 3649328 ; 364933 ; 3649332 ; 3649333 ; 3649334 ; 36493362 ; 364939 ; 3649395 ; 364239 ; 3642397 ; 3642423 ; 36424231 ; 364247 ; 3642472 ; 3642474 ; 3642478 ; 3642624 ; 3642629 ; 364251 ; 3642604 ;
Abstract
Disclosed is a DMA controller incorporated in a data processor, comprising a plurality of channels and a control circuit for overseeing these channels. Each of these channels has registers for storing transfer parameters (address and byte count), registers for storing control parameters (status and command), data assembler circuit, and a channel control circuit that controls these registers and data assembler circuits. The channel control circuit in each channel simultaneously processes transfer parameters for an increased data transmission rate and a reduction of the internal processing unit work load.