Computer system having circuitry interfacing a DMA controller di

Details Computer system having circuitry interfacing a DMA controller di Computer system having circuitry interfacing a DMA controller di

1995-03-14

1996-07-23

Lee, Thomas C.

Boots, shoes, and leggings

395845, 3642384, 3642423, 36424231, 364DIG1, G06F 1200

Patent

active

055399177

ABSTRACT:
The parallel or printer port in a personal computer can receive data from the memory under the control of the direct memory access (DMA) controller, releasing processor resources. The processor enables the parallel port, which then indicates to the DMA controller the desire to transfer data. A state machine in the parallel port, along with associated circuitry, responds to the transfer of the data to the parallel port and then controls the transfer of the data to the attached device, usually a printer. The state machine causes an interrupt to the processor when the transfer is complete or on receipt of errors from the external device. The state machine also communicates with the DMA controller to repeat the transfer process until the transfer is complete or an error occurs. Various DMA channels and parallel port locations can be used. Direct transfers by the processor are blocked during DMA controller handled transfers.

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