Data transition tracking for received data
AssigneeTexas Instruments Incorporated
InventorMichael Gerald Vrazel
Life of this patent
Estimating the term…
Abstract
Signal conditioning circuitry includes logic circuitry, a low-pass filter, and comparator circuitry. The logic circuitry is configured to compare a data unit with a preceding data unit, from a sequence of data units, and provide a logic output signal. The low-pass filter is coupled to the logic circuitry, and the low-pass filter is configured to provide a data transition density measurement for the sequence of data units based on the logic output signal. The comparator circuitry is coupled to the low-pass filter, and the comparator circuitry is configured to compare the data transition density measurement to a threshold and, based on the comparison to the threshold, indicate a disruptive pattern in the sequence of data units.
Claims17
A circuit comprising:
- an equalizer having an input and an output;
- a slicer having an input coupled to the output of the equalizer and having an output;
- a delay line having an input coupled to the output of the slicer, and having an output;
- an exclusive OR gate having a first input coupled to the output of the slicer, having a second input coupled to the output of the delay line, and having an output;
- a low-pass filter having an input coupled to the output of the exclusive OR gate and having an output, the low-pass filter configured to provide a data transition density measurement for a sequence of data units at the output of the slicer;
- and
- comparator circuitry having an input coupled to the output of the low-pass filter and having an output coupled to the input of the equalizer, the comparator circuitry configured to compare the data transition density measurement to a threshold and indicate a disruptive pattern in the sequence of data units.
A circuit comprising:
- an equalizer having an input and an output;
- a sampler or a slicer having an input coupled to the output of the equalizer and having an output;
- a deserializer having an input coupled to the output of the sampler or slicer, and having outputs;
- exclusive OR gates having inputs coupled to the outputs of the deserializer, and having outputs;
- a digital low-pass filter having inputs coupled to the outputs of the exclusive OR gates and having an output, the low-pass filter configured to provide a data transition density measurement for a sequence of data units at the output of the sampler or slicer;
- and
- comparator circuitry having an input coupled to the output of the low-pass filter and having an output coupled to the input of the equalizer, the comparator circuitry configured to compare the data transition density measurement to a threshold and indicate a disruptive pattern in the sequence of data units.
A circuit comprising:
- an equalizer having an input and an output;
- a sampler having an input coupled to the output of the equalizer and having an output;
- delay circuitry having an input coupled to the output of the sampler, and having an output;
- an exclusive OR gate having a first input coupled to the output of the sampler, having a second input coupled to the output of the delay circuitry, and having an output;
- a low-pass filter having an input coupled to the output of the exclusive OR gate and having an output, the low-pass filter configured to provide a data transition density measurement for a sequence of data units at the output of the sampler;
- and
- comparator circuitry having an input coupled to the output of the low-pass filter and having an output coupled to the input of the equalizer, the comparator circuitry configured to compare the data transition density measurement to a threshold and indicate a disruptive pattern in the sequence of data units.
Dependencies are inferred from the claim text.