Communication system, a synchronization circuit, a method of communicating a data signal, and method of synchronizing with a data signal

A method of synchronizing with a data signal comprising:

• providing a data signal having a first portion and a second portion;
• generating a timing signal;
• first adjusting the timing signal during the first portion of the data signal;
• accumulating a history value during the first portion of the data signal;
• and
• second adjusting the timing signal during a second portion of the data signal using the history.

A method of synchronizing with a data signal comprising:

• providing a data signal including digital information;
• deriving timing information during a first portion of the data signal;
• generating a timing signal;
• detecting an absence of timing information during a second portion of the data signal;
• and
• adjusting the timing signal during the second portion of the data signal.

A method of calculating error of a timing signal with respect to a data signal comprising:

• receiving a data signal containing plural digital values;
• first analyzing the data signal corresponding to a first portion of a selected digital value of the data signal;
• providing a first reference value responsive to the first analyzing;
• second analyzing the data signal corresponding to a second portion of the selected digital value of the data signal;
• providing a second reference value responsive to the second analyzing;
• and
• comparing the first reference value with the second reference value.

A method of synchronizing with a data signal comprising:

• providing a data signal including a preamble and a data portion;
• generating a timing signal having a phase and frequency, the generating including:
• providing a nominal frequency signal;
• and
• converting the nominal frequency signal to a bit clock signal;
• sampling the data signal according to the timing signal;
• determining error of the timing signal with respect to the data signal, the determining including:
• measuring first and second reference values of the data signal;
• and
• comparing the first and second reference values;
• first adjusting the phase of the timing signal during the preamble of the data signal, the first adjusting being responsive to the determining;
• accumulating a history during the preamble and responsive to the determining;
• adjusting the frequency of the nominal frequency signal using the history;
• detecting an absence of timing information within the data signal;
• and
• following the detecting, second adjusting the phase of the timing signal using the history during the data portion of the data signal.