Circuit for coupling an event indication signal across asynchron

Details Circuit for coupling an event indication signal across asynchron Circuit for coupling an event indication signal across asynchron

1996-11-08

1998-03-10

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327141, 327145, 327161, 327176, H04L 702

Patent

active

057265950

ABSTRACT:
A circuit is for re-synchronizing an event indication signal received from a foreign domain to generate a result indication signal that is re-synchronized to a host clock signal. The event indication signal is received from the foreign domain at a first input terminal; and a host clock signal is received at a second input terminal. Edge-triggered flip flop circuitry of the circuit has a clock input, a data input, and a data output. The clock input is coupled to the second input terminal and the data input is coupled to receive a latch output signal. The edge-triggered flip flop circuitry clocks the latch output signal to the data output of the flip flop circuitry, to generate a result event indication signal, in response to a transition in the host clock signal. Delay circuitry is coupled to the first input terminal to receive the event indication signal. The delay circuitry provides a delayed event indication signal having a phase that is delayed from the event indication signal. Transparent latch circuitry latches the delayed event indication signal responsive to a latch control signal, and combination circuitry is coupled to receive the event indication signal and the result event indication signal, and provides a combination thereof as the latch control signal.

REFERENCES:
patent: 4928290 (1990-05-01), Vo
patent: 5388225 (1995-02-01), Cantrell et al.

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