Non-return to zero synchronizer

Details Non-return to zero synchronizer Non-return to zero synchronizer

1990-12-20

1992-07-07

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

375119, 307269, H04L 700

Patent

active

051289709

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.

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patent: 4745530 (1988-05-01), Hanawa et al.
patent: 4926445 (1990-05-01), Robb
patent: 4935942 (1990-06-01), Hawang et al.
patent: 4949360 (1990-08-01), Martin

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