Direct memory access (DMA) sampler

Details Direct memory access (DMA) sampler Direct memory access (DMA) sampler

1992-05-22

1996-01-09

Chan, Eddie P.

Coded data generation or conversion

Analog to or from digital conversion

Multiplex

364DIG1, 364920, 364926, 3649394, 341123, G06F 1310, G06F 1322

Patent

active

054832390

ABSTRACT:
A microprocessor-based system includes a central processing unit (CPU) and a CPU memory coupled by a CPU bus. A DMA sampler is coupled to the CPU, the CPU memory and the CPU bus. The DMA sampler includes sampling circuitry which is implemented as a finite state machine to maintain a substantially exact sampling rate on at least one analog input signal provided to the DMA sampler. The DMA sampler also includes DMA circuitry implemented as a data flow machine, which requests bus mastership from the CPU when samples obtained by the DMA sampler are available for transfer to the CPU memory. In response to the request, the CPU relinquishes bus mastership to the DMA sampler which provides the sample to the CPU memory and returns bus mastership to the CPU.

REFERENCES:
patent: 4589020 (1986-05-01), Akatsuka
patent: 4742458 (1988-05-01), Nathans et al.
patent: 4794460 (1988-12-01), Shiota
patent: 4817176 (1989-03-01), Marshall et al.
patent: 4891713 (1990-01-01), Mizukoshi et al.
patent: 4994914 (1991-02-01), Wiseman et al.
patent: 5127404 (1992-07-01), Wyborny et al.
patent: 5257025 (1993-10-01), LeCroy, Jr.
patent: 5293167 (1994-03-01), Campbell, Jr. et al.

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