Serial link transparent mode disparity control
US4859815A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1988 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Dec 19, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0083
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a serial link in which it is necessary to occupy the link before and after transmission of a frame by sending a succession idle characters having alternating disparity effects, the disparity effect of the last character in the frame is compared with the disparity effect that would be produced by a disparity flip-flop, which has continued to step during frame transmission. If the disparity effect of these two characters match, no corrective action is required in order to resume the stream of idle characters. If the disparity effect of these characters differ, the disparity flip-flop is corrected before the stream of idle characters is resumed. Disclosed is hardware logic to accomplish this disparity control following transmission of frames in a transparent mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.