Image data processing circuit and method of accessing storing means for the processing circuit
US5349449A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1993 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Jul 7, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3297
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit according to the present invention has an input image processing circuit 11 and an image output processing circuit 12 which are asynchronously operated and a shared memory 18. In addition, it has a memory access signal switching circuit 110. The input image processing circuit 11 and the image output processing circuit 12 access the memory 18 in synchronization with the same memory access synchronous clock SYSCLK, and the access right of the image output processing circuit 12 precedes the access right of the input image processing circuit 11. If one cycle of the processing operation of the input image processing circuit 11 is set longer than the sum of the maximum time period during which the input image processing circuit 11 accesses the memory 18 and the maximum time period during which the image output processing circuit 12 accesses the memory 18, the access to the memory 18 by the input image processing circuit 11 and the access to the memory by the image output processing circuit 12 are not overlapped with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.