Circuit synchronization when switching between multiple clock si

Details Circuit synchronization when switching between multiple clock si Circuit synchronization when switching between multiple clock si

1995-03-31

1996-04-30

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327145, 327152, 327151, 375362, 375371, H03L 700

Patent

active

055128513

ABSTRACT:
A data processing system having a first circuit and a second circuit that together control a third circuit by a respective first control signal and a second control signal. The first circuit issues a request signal to the second circuit to trigger initiation of the operation of the third circuit and the second circuit returns a grant signal to the first circuit to indicate that operation of the third circuit has completed. An advance controller within the second circuit serves to start to synchronize the grant signal back to the clock signal of the first circuit at one of a plurality of possible times that is selected to match the relative frequencies of the clock signals driving the first circuit and the second circuit.

REFERENCES:
patent: 4970418 (1990-11-01), Masterson
patent: 5012138 (1991-04-01), Suzuki
patent: 5144170 (1992-09-01), Parker

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