Non-return to zero synchronizer
US5128970A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1990 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Dec 20, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/033
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A non-return-to-zero synchronizer is described which creates an output pulse signal that is synchronized to a system clock signal, from an asynchronous input strobe signal which can occur at any point in a given system clock cycle. The first circuit element within the synchronizer captures the input strobe and toggles the state of its data output terminal in response to successive pulses of the asynchronous input strobe signal. The remaining portion of the synchronizer responds to each change in the state of the first circuit element and to produce an output pulse having a duration of one clock cycle. An alternative embodiment is described which utilizes a sequential logic circuit to generate the desired output pulse. Because the synchronizer uses a state change to indicate the occurrence of a strobe, the problem of resetting the initial circuit element to a particular logic level is eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.