Circuit for asynchronous communications, related system and method

A system, comprising:

• a transmitter;
• a receiver;
• a communication channel including a plurality of signal lines and configured to carry asynchronous data between the transmitter and receiver;
• and
• a detector coupled to the plurality of signal lines and including:
• an input module configured to detect data on a plurality of signal lines and to generate:
• a first signal indicative of asynchronous data on said plurality of signal lines satisfying a stability criteria;
• and
• a second signal indicative of said plurality of signal lines being de-asserted;
• and
• an output module configured to generate a detection signal having:
• a first value when the first signal is asserted;
• and
• a second value when said second signal is asserted, wherein the output module is configured to hold a current value of the detection signal when the first and second signals are not asserted.

A method, comprising:

• asserting a first signal when asynchronous data on a plurality of signal lines satisfy a stability criteria;
• asserting a second signal when the signal lines are de-asserted;
• generating a detection signal having a first value when the first signal is asserted and a second value when the second signal is asserted;
• and
• maintaining a current value of the detection signal when the first signal and the second signal are not asserted.

A system, comprising:

• means for determining whether asynchronous data on a plurality of signal lines satisfy a stability criteria;
• means for determining whether the signal lines of the plurality are de-asserted;
• and
• means for setting a detection signal to a first value in response to a determination that the asynchronous data on the plurality of signal lines satisfy the stability criteria, setting the detection signal to a second value in response to a determination that the plurality of signal lines are de-asserted, and otherwise maintaining a current value of the detection signal.