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Explain different modes of operation of 8257 DMA controller.
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written 7.1 years ago by
meghalikalyankar
• 2.3k
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DMA controller has four modes for data transfer:
1. Single Byte Transfer Mode/ Cycle Stealing
- Once the DMAC becomes the bus master, it will transfer only ONE BYTE and return the bus back to the microprocessor. As soon as the microprocessor performs one bus cycle, DMAC will once again take …
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