Computer system having programmable dma control

Details Computer system having programmable dma control Computer system having programmable dma control

G - Physics

06

F

354/230.8

G06F 13/30 (2006.01) G06F 3/00 (2006.01) G06F 13/36 (2006.01)

Patent

CA 1290068

IBM Docket No. BC9-86-010 COMPUTER SYSTEM HAVING PROGRAMMABLE DMA CONTROL ABSTRACT OF THE DISCLOSURE A computer system in which peripherals greater in number than the number of DMA channels provided in the system can all have DMA access. Some of the DMA channels are dedicated to certain ones of the peripher- als, while others, termed "programmable" DMA channels, are shared by remaining ones of the peripherals. Each peripheral having DMA access has a channel priority value. When a peripheral wants DMA access, it trans- mits its channel priority value onto an arbitration bus. The winning channel priority value is then compared with prestored DMA channel assignment values. If the comparison is successful, the corresponding peripheral is given a DMA channel corresponding to the DMA channel assignment value with which the comparison was successful.

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