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:
Jun. 25, 1996
Filed:
Nov. 24, 1992
Hiroshi Nitta, Atsugi, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A data transmission processing system provided between a host unit and peripheral devices including at least a memory device and a processing device. The host unit outputs, to the transmission processing system, DMA transmission process request commands. The data transmission process system includes a DMA control unit, provided with a plurality of DMA channels, for cyclically selecting a DMA channel from the plurality of DMA channels in accordance with a predetermined priority, the plurality of DMA channels being allocated to processes with respect to the peripheral devices, and a DMA execution unit for carrying out a DMA transmission process for transmitting data output from the host unit to the memory device via a selected DMA channel corresponding to the memory device in data transmission timing of the host unit and a DMA transmission process for transmitting data stored in the memory device to the processing device via a selected DMA channel corresponding to the processing device in accordance with the DMA transmission process request commands supplied from the host unit.