Dual port memory system for buffering asynchronous input to a raster scanned display
US6271866A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1998 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Dec 23, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C8/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system which utilizes dual-port memory to seamlessly display video frames on a raster scanned display device. Dual port memory is partitioned into a `single frame buffer` having sufficient capacity to buffer a full video frame, and an `extension buffer` which is a contiguous extension of the single frame buffer. The two sections together comprise an `extended buffer`. As long as the video memory write and read addresses are sufficiently separated by a predetermined number of lines, video data is written and read using the single frame buffer for each frame. When the write and read addresses are closer than a predetermined number of lines, the incoming video data for the next several new frames is written using the `extended` buffer, and also read therefrom. After the write and read addresses are again sufficiently separated, video data is written and read using only the single frame buffer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.