DMA Bus load varying unit

Details DMA Bus load varying unit DMA Bus load varying unit

1983-02-24

1985-02-26

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 1100, G06F 1300, G06F 1540

Patent

active

045021171

ABSTRACT:
A DMA bus load varying unit applied to a data processing system has a DMA bus and a memory connected to the DMA bus is provided with a mode designating circuit for designating a memory read and write operation, a continuous operation of the memory read and write operation, and a start and stop operation of the memory read and write operation for the memory, a clock-pulse generator connected to said mode-designating circuit, a period counter connected to the clock-pulse generator for counting clock-pulse signals from the clock-pulse generator, a period-setting circuit for specifying an arbitrary period, a first comparator for comparing the output from the period counter with the output from the period-setting circuit and for producing a first coincident signal when they are equal, a flip-flop connected to the first comparator for producing the DMA bus request signal in accordance with the coincident signal; DMA bus circuit connected to the mode-designating circuit and the flip-flop which is triggered by the DMA bus request signal and performs the memory access through the DMA bus in accordance with the mode designated by the mode-designating circuit, a size counter connected to the DMA bus circuit for counting the number of the DMA bus cycles of said DMA bus circuit, a transfer data size-setting section for specifying an arbitrary transfer data size, a second comparator for comparing the output from the size counter and the output from the transfer data size-setting section and for producing a second coincident signal when they are equal, the second coincident signal being supplied to initialize the DMA bus circuit, and a timer for counting clock pulses from the clock pulse generator to perform time measurement until a specified data transfer is completed.

REFERENCES:
patent: 4096567 (1978-07-01), Millard et al.
patent: 4159534 (1979-06-01), Getson, Jr. et al.

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