Apparatus for processing digital signals
US4409652A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1980 |
| Grant date | Oct 11, 1983 |
| Priority date | — |
| Expiry date | Sep 12, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG16H40/63
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.