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:
Nov. 28, 2000
Filed:
Apr. 30, 1997
Craig MacKenna, Los Gatos, CA (US);
Gyle Yearsley, Boise, ID (US);
Zilog, Inc., Campbell, CA (US);
Abstract
An improved DMA controller is provided. The improved DMA controller uses a peripheral control bus which has scan codes to indicate the DMA channel, conventional data request/data acknowledge lines, and additional lines indicating a 'terminate,' 'type fetch,' 'end of buffer' and 'store status.' List entries are associated with the buffers in the memory. Each list entry has a type/status field which can be coded with information indicating 'ready buffer,' whether to notify 'end of buffer,' 'buffer in progress,' 'completed buffer without status,' 'completed buffer with status,' 'ready buffer with command,' and 'ready buffer without command.' The type of status byte can be checked before processing the buffers.