Automatic clock rate synchronization for 1-wire radio frequency front-end interface

An apparatus comprising:

• means for counting transitions in a locally generated clock signal, including a counter configured to count the transitions when a data signal is received from a 1-wire serial bus;
• means for capturing an output of the counter, including a latch configured to provide a latched output representative of the transitions counted in the locally generated clock signal while a synchronization pattern is received in the data signal;
• means for comparing the output of the counter and the latched output, including a comparator configured to:
• drive a decision signal to a first signaling state when the output of the counter matches the latched output;
• and
• drive the decision signal to a second signaling state when the output of the counter does not match the latched output;
• and
• a flipflop clocked by the decision signal and having an output that changes signaling state in response to an edge in the decision signal,
• wherein the counter is reset when the decision signal is driven to the first signaling state.

A method for generating a rate matched clock signal, comprising:

• configuring a counter to count transitions in a locally generated clock signal when a data signal is received from a 1-wire serial bus;
• configuring a latch to capture an output of the counter and to provide a latched output representative of the transitions counted in the locally generated clock signal while a synchronization pattern is received in the data signal;
• and
• configuring a comparator to:
• drive a decision signal to a first signaling state when the output of the counter matches the latched output;
• and
• drive the decision signal to a second signaling state when the output of the counter does not match the latched output,
• wherein the decision signal is configured to clock a flipflop that has an output that changes signaling state in response to an edge in the decision signal, and
• wherein the counter is reset when the decision signal is driven to the first signaling state.