8237-DMA Controller 27 December 2016 Pramod Ghimire . September 1993 Order Number: 231466-005 8237A HIGH PERFORMANCE PROGRAMMABLE DMA CONTROLLER (8237A-5) Y Enable/Disable Control of Individual DMA Requests Y Four Independent DMA Channels Y Independent Autoinitialization of All Channels Y Memory-to-Memory Transfers Y Memory Block Initialization Y Address Increment or Decrement Y High Performance: Transfers up to … In DMA, µP releases the control of the buses to a device called a DMA controller. Slide 3 of 14 DMA Operation Direct Memory Access (DMA) is an I/O technique commonly used for high-speed data transfer; for example , data transfer between memory and a floppy disk. This controller contained 4 independent 8-bit channels consisting of both an address register and counter. Programming the 8237. The later IBM PC/AT added a second 8237 in cascade mode, so extending the functionality by providing both 16-bit transfers and 4 additional channels.

The original IBM Personal Computer 5150 shipped with an Intel 8237 DMA controller. Slide 2 of 14 Direct Memory Access 27 December 2016 Pramod Ghimire .

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