Dynamic bit inversion for reduced overhead DC-balanced coding

A system for encoding data for transmission through an electrical connection, comprising an encoder configured to:

• in response to determining a disparity between a first number of logic high bits and second number of logic low bits of a first portion of the data that has been encoded and transmitted through the electrical connection is greater than a threshold value, compute a polarity bit;
• transmit the polarity bit through the electrical connection;
• encode a second portion of the data for transmission by performing a logic operation on bits of the second portion of the data using the polarity bit;
• and
• transmit at least the threshold value quantity of the encoded second portion of the data before comparing the disparity with the threshold value.

A data transmission process comprising:

• determining a logic level disparity for a transmitted codeword comprising a plurality of first data bits;
• in response to determining the logic level disparity satisfies a threshold value, computing a lookahead logic level disparity for second data bits to transmit subsequent to the first data bits;
• computing a polarity bit based on a combination of the logic level disparity and the lookahead logic level disparity;
• and
• transmitting the polarity bit and subsequently encoding the second data bits according to the polarity bit.

A method of DC-balancing data for transmission through an electrical connection, comprising:

• computing a disparity between a first number of logic high bits and second number of logic low bits of a first portion of the data that has been encoded and transmitted through the electrical connection;
• in response to determining the disparity is greater than a threshold value, computing a lookahead disparity for a second portion of the data that immediately follows the first portion of the data;
• computing a polarity bit based on a combination of the disparity and the lookahead disparity;
• and
• transmitting the polarity bit through the electrical connection.