Apparatus and method for detecting end of serial bit stream
US5870437A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1996 |
| Grant date | Feb 9, 1999 |
| Priority date | — |
| Expiry date | Nov 1, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/45
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A detector detects the end of a serial bit stream wherein the serial bit stream is based on one clock and the detector (and other associated circuitry) is based on a different, asynchronous clock. An Exclusive OR block receives the serial bit stream and a digital strobe signal according to IEEE High Performance Serial Bus Specification 1394. Based on this standard, one but not both of the serial bit stream and digital strobe signal changes level every data interval. The Exclusive OR block outputs a periodic signal when the serial bit stream and digital strobe signal are present but outputs a constant digital level upon termination of the serial bit stream and digital strobe signal. The detector also includes a first register coupled to receive the output of the receiver, a second register coupled to receive the output of the first register and a third register coupled to receive the output of the second register. All three registers are clocked simultaneously. The serial bit stream and digital strobe signal are asynchronous relative to the clock. Hardware logic determines when contents of the third register is same as contents of the second register; this indicates termination of t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.