DMA multimode transfer controls

Details DMA multimode transfer controls DMA multimode transfer controls

1983-04-14

1985-07-16

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 900

Patent

active

045300534

ABSTRACT:
Circuitry is provided to be used in association with a single transfer mode DMAC device to enable a programmer to control the number of bytes transferred during a DMA transfer cycle. The circuitry receives a coded mode control message from the microprocessor before transferring control of the data and address busses to the DMAC and generates one or both of two data transfer strobe signals which instruct the memory to transfer contiguous bytes, contiguous high alternate order bytes, or contiguous low alternate order bytes, or both.

REFERENCES:
patent: 4172283 (1979-10-01), Kober
patent: 4213177 (1980-07-01), Schmidt
patent: 4371925 (1983-02-01), Carberry et al.
patent: 4371928 (1983-02-01), Barlow et al.
patent: 4375665 (1983-03-01), Schmidt
patent: 4467447 (1984-08-01), Takahashi

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