Information processor

Abstract

Abstract PURPOSE: To perform flexible high-speed data transfer between input-output equipment and a memory by providing a direct memory access controller that exercises continuous and automatic control on direct memory access transfer regarding plural data blocks. CONSTITUTION: Direct memory access DMA start addresses of data blocks decentralized in the memory and the number of words are stored in memory part 3 successively. At the point in time when DMA transfer regarding one data block ends, the contents of memory part 3 assigned by the contents of the 2nd address register 4 are loaded into the 1st address register 1 and count register 2. Further, the DMA transfer regarding the next data block is started and repeated while the contents of register 4 are updated. Thus, the DMA controller that exercises continuous and automatic control on the DMA transfer regarding data blocks is provided so as to attain flexible high-speed data transfer between the input-output equipment and memory. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Hiromasa Tanabe

Bibliographic Details