Frequency responsive bus coding

A method for controlling a bus having at least two signal lines, the method comprising:

• generating a measure for each of a group of signals to be concurrently transmitted by a transmitter on the bus;
• detecting a predetermined frequency component in a variation of the measure over time to generate a coding control signal;
• and
• controlling coding of the bus in response to the detecting.

An integrated circuit for bus coding comprising:

• a detector to sense a frequency spectrum characteristic associated with aggregated, concurrent transmission on a plurality of signal lines of a bus and to generate a control signal based on the frequency spectrum characteristic;
• a bus encoder coupled with the detector to set data encoding of the plurality of signal lines of the bus;
• and,
• wherein the bus encoder is set by the control signal.

A method of encoding a bus, comprising:

• encoding signals to be transmitted by a sender over the bus;
• monitoring a frequency component present in a time-varying measure of all signals concurrently transmitted over the bus;
• and
• controlling the encoding to reduce the magnitude of at least one frequency component in the time-varying measure.