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

1993-07-13

1996-09-03

Kriess, Kevin A.

Boots, shoes, and leggings

364DIG1, 364271, 3642714, 3642719, G06F 112

Patent

active

055532756

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 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 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, p. 65.

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