Dma emulation for non-dma capable interface cards

Details Dma emulation for non-dma capable interface cards Dma emulation for non-dma capable interface cards

G - Physics

06

F

G06F 13/38 (2006.01) G06F 9/455 (2006.01) G06F 13/10 (2006.01) G06F 13/28 (2006.01)

Patent

CA 2135505

A method and means are provided for simulating a direct memory access (DMA) function to access memory in a host computer having a DMA controller for the purpose of enabling the transfer of data between the host memory and a computer accessory data handling device not capable of DMA operation that can be operably connected to the host including determining the location in the host memory for data to be transferred from the host memory to the accessory data handling device or from the accessory data handling device to the host memory by reading the memory address contents of the DMA controller. Data is read from the host memory at the address specified in the DMA controller and written to the accessory data handling device or read from the accessory data handling device and written to the host memory at the address specified by the DMA controller, respectively. The host computer is informed that a DMA operation corresponding to the data transfer has been completed when the data transfer required has been completed.

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