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What is Overview of 8257/8237 DMA Controllers about?

The document discusses direct memory access (DMA) and the Intel 8257/8237 DMA controller chip. It explains that DMA allows peripheral devices to directly access main memory without involving the CPU. The 8257/8237 is a 4-channel DMA controller that interfaces with peripherals to arbitrate DMA requests and provide address/control signals for data transfers between peripherals and memory. It has registers like current address, mode and status registers that are programmed to configure the DMA transfers.

Author

infinity Infinity

Language

EN