Apparatus for controlling a direct memory access operation in an

Details Apparatus for controlling a direct memory access operation in an Apparatus for controlling a direct memory access operation in an

1996-10-23

1999-07-27

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

395114, 395109, 358426, 358448, B41B 1500, H04N 141, H04N 140

Patent

active

059304642

ABSTRACT:
A plurality of image data are DMA transferred to a printer for printing images as required, and the image data are once buffered in FIFO memories before they are output to the printer so as to reduce an amount of used memories and to provide efficient bus transactions. A DMA transfer apparatus includes a main memory, a CPU and a DMA controller, and is connected to a printer through a printer interface. The DMA controller has a plurality of DMA address registers and transfer count registers, FIFO memories for holding associated data therein and a selector unit for selecting DMA. The selector unit selects DMA addresses at about an earlier output timing to start a plurality of DMA operations to transfer data in conformity to the data output timing.

REFERENCES:
patent: 5574834 (1996-11-01), Horie et al.
patent: 5638183 (1997-06-01), Hayashi et al.

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