LOW POWER PHYSICAL LAYER DRIVER TOPOLOGIES

摘要

System, methods and apparatus are described that facilitate transmission of data, particularly between two devices within electronic equipment. Transmission lines are selectively terminated in an N-phase polarity encoded transmitter when the transmission lines would otherwise be undriven. Data is mapped to a sequence of symbols to be transmitted on a plurality of wires. The sequence of symbols is encoded in three signals. A first terminal of a plurality of terminals may be driven such that transistors are activated to couple the first terminal to first and second voltage levels. The first terminal may further be driven such that a dedicated transistor is activated to couple the first terminal to an intermediate voltage level. The dedicated transistor is activated based on a voltage level for driving a second terminal of the three terminals and a voltage level for driving a third terminal of the three terminals.

主权项

1. A method of data transfer, comprising:
mapping data to a sequence of symbols to be transmitted on a plurality of wires via a plurality of terminals; encoding the sequence of symbols in three signals, wherein each of the three signals is in one of three phases for each symbol to be transmitted, and wherein the three signals are in different phases from one another during transmission of each symbol; obtaining a signal to be transmitted via a first terminal of the plurality of terminals, wherein the signal is one of the three signals; driving the first terminal by outputting a first voltage level from a first driver when the signal is in a first phase; driving the first terminal by outputting a second voltage level from the first driver when the signal is in a second phase; and driving the first terminal by outputting a third voltage level from a second driver when the signal is in a third phase, wherein the third voltage level is output based on a fourth voltage level for driving a second terminal of the plurality of terminals, and based on a fifth voltage level for driving a third terminal of the plurality of terminals.