Synchronized two-way direct current (dc) data-bus-inversion encoding for simultaneous bi-directional signaling

A method of operating a communication system comprising a plurality of simultaneous bidirectional (SBD) transceiver pairs coupled to a plurality of data lanes, an inversion SBD transceiver pair coupled to a separate data lane, an encoder coupled to a first side of the plurality of SBD transceiver pairs, and a decoder coupled to a second side of the plurality of SBD transceiver pairs, the method comprising:

• generating, by the encoder, data bus inversion (DBI)-encoded bits;
• transmitting, by the encoder, an inversion signal over the separate data lane via the inversion SBD transceiver pair;
• receiving, by the decoder, the DBI-encoded bits from the plurality of SBD transceiver pairs;
• and
• inverting, by an inversion circuit of the decoder, a received DBI-encoded bit based on the inversion signal to generate decoded data.

A decoder device for a simultaneous bidirectional (SBD) communication system, the decoder device comprising:

• a set of inversion circuits coupled to receive data bus inversion (DBI)-encoded bits from a plurality of SBD transceiver pairs over a plurality of data lanes, each inversion circuit comprising an inverter and a multiplexer;
• and
• an input terminal to receive an inversion signal from an inversion SBD transceiver pair over a separate data lane that is different than the plurality of data lanes;
• wherein the set of inversion circuits is configured to output decoded data based on the inversion signal received from the inversion SBD transceiver pair.