Computer system having programmable DMA control

Details Computer system having programmable DMA control Computer system having programmable DMA control

1987-03-27

1990-02-13

Chan, Eddie P.

Boots, shoes, and leggings

36424231, 3642412, 3642414, 3642423, G06F 1300, G06F 1328

Patent

active

049012347

ABSTRACT:
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 peripherals, 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 transmits 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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