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. 22, 1994
Filed:
Dec. 13, 1990
Yoshiyuki Miki, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A Direct Memory Access (DMA) controller (1) of a 2-bus cycle transfer type executes a read cycle first to fetch data from a data source then internally rearranges or aligns the fetched data in accordance with a bus width and/or a storing address of a data destination unit and thereafter executes a write cycle to write the rearranged data in the data destination unit. The DMA controller includes a data register (106) having first and second fields (106-1 and 106-2). Data from the data source is temporarily stored in one of the first and second fields of the data register during the read cycle, and data in the other of the first and second fields is written to the data destination unit during the write cycle.