Apparatus for processing digital signals

Details Apparatus for processing digital signals Apparatus for processing digital signals

1980-09-12

1983-10-11

Springborn, Harvey L.

Boots, shoes, and leggings

G06F 1516, G06F 1520, G06F 1100

Patent

active

044096526

ABSTRACT:
The apparatus contains a microprocessor circuit, which comprises a preprocessor which is not DMA-capable in itself and a DMA-capable central processor. Both processors can be made to communicate with each other by means of a main memory. This is performed by temporarily cutting off the communication path between said DMA-capable central processor and said main memory, specifically by an artificial DMA request via the address line of said preprocessor, and by establishing instead a communication path between said preprocessor and said main memory. The communication of said preprocessor with said main memory is started after said central processor has sent a return message signal to said preprocessor, whereby it confirms that its own communication with said main memory is completed.

REFERENCES:
patent: 3534338 (1970-10-01), Christensen et al.
patent: 3588881 (1971-06-01), Gordon
patent: 4096567 (1978-06-01), Millard et al.
patent: 4110823 (1978-08-01), Cronshaw et al.
patent: 4145739 (1979-03-01), Dunning et al.
patent: 4156904 (1979-05-01), Minowa et al.
patent: 4236086 (1980-11-01), Hoebel
Brochure "Models 78341A/78342A Monitors-Patient Monitoring", 1978, Hewlett-Packard, Medical Products Grp., Waltham, Mass.

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