Automatic phase-detection circuit for clocks with known ratios

Details Automatic phase-detection circuit for clocks with known ratios Automatic phase-detection circuit for clocks with known ratios

2008-01-23

2009-10-27

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

C327S003000, C327S012000

Reexamination Certificate

active

07609092

ABSTRACT:
An automatic phase detection circuit for generating an internal synchronization signal when two clock input signals achieve a certain phase relationship. No external reference signal is required. The logic state of one clock is sampled on the active edge of the other clock and stored in a shift register. The content of the shift register is compared to a pre-defined signature and a sync signal is generated when the content matches the pre-defined signature. A mask register may be used to define which bits of the shift register and pre-defined signature are compared.

REFERENCES:
patent: 7073098 (2006-07-01), Kozaki
Author Unknown, “Clock Domain Crossing”, Technical Paper, Cadence Design Systems, Inc., 2004.
Author Unknown, “Digital comparator”, http://en.wikipedia.org/wiki/Digital—comparator.
Author Unknown, “Metastability in electronics”, http://en.wikipedia.org/wiki/Metastability—in—electronics, at least as early as Jul. 11, 2007.
Author Unknown, “Shift register”, http://en.wikipedia.org/wiki/Shift—register, at least as early as Jul. 11, 2007.
Semeraro et al., “Energy-Efficient Processor Design Using Multiple Clock Domains with Dynamic Voltage and Frequency Scaling”, Departments of Computer Science and of Electrical and Computer Engineering, University of Rochester, at least as early as the filing date of the application.

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