Altera Corporation

Da Hai Tang

Boon Hong Oh

Peter Schepers

A circuit includes a receiver circuit, a data valid monitor circuit, a clock signal generation circuit, and a phase shift circuit. The receiver circuit is operable to generate a first periodic signal, a sampled data signal based on an input data signal, and a data valid signal based on a predefined number of bits in the sampled data signal. The data valid monitor circuit is operable to generate a count value by counting periods of the first periodic signal. The data valid monitor circuit is operable to generate a phase error signal based on the data valid signal and the count value. The clock signal generation circuit is operable to generate a second periodic signal. The phase shift circuit is operable to generate a third periodic signal based on the second periodic signal and to adjust a phase of the third periodic signal based on the phase error signal.

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Shanghai, China

Da Hai Tang