Communication protocol for die to die interface

A system comprising:

• a receiver circuit configured to receive an input voltage waveform from a single wire and configured to generate an output bit stream corresponding to the input voltage waveform, the receiver comprising:
• a comparison circuit configured to provide a first indicator to indicate whether or not a voltage level of the input voltage waveform is higher than a high voltage threshold and a second indicator to indicate whether or not the voltage level of the input voltage waveform is lower than a low voltage threshold, wherein the high voltage threshold is greater than the low voltage threshold;
• and
• a bit value generator configured to provide a next bit value of the output bit stream based on the first indicator and the second indicator, and, when the first indicator indicates the voltage level is not higher than the high voltage threshold and the second indicator indicates the voltage levels is not lower than the low voltage threshold, the next bit value is provided based further on an immediately previous bit value of the output bit stream.

A method of generating an output bit stream from an input voltage waveform, comprising:

• determining whether a voltage level of the input voltage waveform is at a high level that is greater than a high voltage threshold, at a low level that is less than a low voltage threshold, or at a mid level between the high and low voltage thresholds, wherein the high voltage threshold is higher than the low voltage threshold;
• when the voltage level is determined to be at the high level, generating a next bit value of the output bit stream as a first logic state;
• when the voltage level is determined to be at the low level, generating the next bit value as a second logic state, opposite the first logic state;
• and
• when the voltage level is determined to be at the mid level, generating the next bit value as a same value as an immediately previous bit value of the output bit stream.