DMA controller which receives size data for each DMA channel

Details DMA controller which receives size data for each DMA channel DMA controller which receives size data for each DMA channel

1996-10-18

1999-10-26

Dinh, Dung C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

710126, G06F 900

Patent

active

059744804

ABSTRACT:
A DMA controller receives size data in association with a DMA request. If first size data is received, a first amount of data (for example, one word) is transferred through the DMA controller for the DMA request. If, on the other hand, second size data is received, then a second amount of data (for example, two words) is transferred through the DMA controller for the DMA request. In the event that a DMA request cannot be serviced when received, the DMA request is stored in the DMA controller for later servicing. Size data for a DMA request is stored so that the size of the data transfer will be known when the stored DMA request is serviced. Using this size data, a single DMA channel can support data transfers of different sizes. In some embodiments, size data is used to increment a DMA current address register by the correct amount after the data associated with the size data is transferred through the DMA controller.

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