Method and apparatus for providing virtual DMA capability on an

Details Method and apparatus for providing virtual DMA capability on an Method and apparatus for providing virtual DMA capability on an

1995-11-02

1997-09-16

Harvey, Jack B.

395500, 395842, 395843, 395527, 395830, G06F 1310, G06F 1312

Patent

active

056689578

ABSTRACT:
Apparatus and method for providing virtual DMA capability for an adapter card connected to a host system bus with no DMA support. A special interface circuit resides on an adapter card together with a cache data memory. A special software driver resides in the host system. The software driver manages DMA transfers for the application processing circuitry on the adapter card using the cache data memory. The processing circuitry on the adapter card transfers data in and out of the cache data memory as if it had direct memory access to host system memory. In this way, an adapter card for a non-DMA-capable bus, such as the personal computer memory card international association (PCMCIA) bus can act as a bus master.

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