Asynchronous state machine synchronization circuit and method

Details Asynchronous state machine synchronization circuit and method Asynchronous state machine synchronization circuit and method

1990-09-27

1992-08-11

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307269, 307480, H03K 1718, H03K 327

Patent

active

051381893

ABSTRACT:
A circuit for sampling a digital input signal utilizing an asynchronous strobe signal and a method for such synchronization are disclosed. The circuit includes an input storage element, such as a latch, which stores the input signal upon receipt of a strobe signal. There is a possibility that the input storage element will become temporarily metastable, with the output of the element being indeterminate, should the digital input signal change levels at substantially the time that the strobe signal is received. The subject synchronization circuit includes circuitry which senses when the input storage element is metastable and gating circuitry which produces a synchronized signal after receipt of the strobe signal, provided the input storage element is not metastable. The synchronized signal can then be used to clock the stored input signal.

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patent: 4800296 (1989-01-01), Ovens et al.
patent: 4835442 (1989-05-01), Dike et al.
patent: 4963772 (1990-10-01), Dike
patent: 4982118 (1991-01-01), Lloyd
"The Art of Electronics" by Horowitz et al, Cambridge Univ. Press, 1980, p. 341.
Introduction to VLSI Systems, 1980 by Carver Mead and Lynn Conway, pp. 260-261.

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