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:
Apr. 28, 1992
Filed:
Jan. 02, 1990
Katsuyuki Kaneko, Osaka, JP;
Yuji Tanikawa, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A data transfer apparatus is capable of DMA-transferring the transferable data sequentially generated by a processor. In the data transfer apparatus is provided a counter or an address latch for storing data corresponding to the upper limit (or lower limit) of the address of the transferable data. The content of this counter or latch and the content of the DMA address counter are sequentially compared and transferred, and when these values finally become equal to each other and there is no longer new transferable data, the DMA transfer is stopped and a transfer request is retained. By this constitution, the data transfer between the processor and a device which requires the data generated by the processor may be done instantly and asynchronously.