Crosstalk reduction coding schemes

摘要

Data coding schemes perform level-based and/or transition-based encoding to avoid signaling conditions that create worst case crosstalk during transmission of multi-bit data from one circuit to another circuit via a parallel communication link. The coding schemes disallow certain patterns from being present in the signal levels, signal transitions, or a combination of the signal levels and signal transitions that occur in a subset of the multi-bit data that corresponds to certain physically neighboring wires of the parallel communication link.

主权项

1. A first circuit to transmit data to a second circuit over a parallel binary communication link having at least n parallel lines, where n is an integer not less than four, the first circuit comprising:
an encoder to receive and encode m-bit data to generate n-bit data for transmission over the parallel binary communication link, wherein
m is an integer not less than three and less than n, and the encoder generates the n-bit data from the m-bit data where no set of three physically neighboring lines of the n parallel lines are permitted to simultaneously carry a predetermined disallowed three-bit value, the predetermined disallowed three-bit value comprises a three-bit value representing a signal level transition in each of the three physically neighboring lines relative to an immediately previous three-bit value in each of the three physically neighboring lines; and a transmitter to transmit the encoded n-bit data over the parallel communication link.