Method and apparatus for synchronously detecting phase relations

Details Method and apparatus for synchronously detecting phase relations Method and apparatus for synchronously detecting phase relations

1996-05-23

1998-02-24

Kriess, Kevin A.

G06F 112

Patent

active

057218900

ABSTRACT:
An apparatus for synchronously detecting phase relationships between a high-frequency clock and a low-frequency clock that are substantially synchronous. The low-frequency clock is frequency divided-by-two to generate a LFdiv2 signal. The LFdiv2 signal is synchronously delayed by one phase of the high-frequency clock to generate a dLFdiv2 signal. The LFdiv2 and dLFdiv2 signals are compared using an XOR gate to generate a PH1 signal. A rising-edge of the PH1 signal indicates that a rising-edge of the high-frequency clock corresponds to a rising-edge of the low-frequency clock. This phase information allows enhanced communication between state machines or buses that are operating at different frequencies.

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Marston, Ray, "Working with Flip Flops", Radio Electronics Magazine, Jun. 1987, pp. 64-65.

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