VOLTAGE MODE DRIVER CIRCUIT FOR N-PHASE SYSTEMS

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. Each of the three terminals may be driven such that transistors are activated to couple a terminal to first and second voltage levels through a pair of impedances when the terminal would otherwise be undriven. The terminal is then pulled toward an intermediate voltage level while the terminal presents a desired impedance level to a transmission line.

主权项

1. A data transfer method comprising:
mapping data to a sequence of symbols to be transmitted on a plurality of wires; 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 signals are in different phases from one another during transmission of each symbol; and driving each of three terminals in accordance with one of the three signals, wherein driving the each of the three terminals comprises:
turning on a first transistor and turning off a second transistor when a corresponding one of the three signals is in a first phase, wherein the each of the three terminals is driven towards a first voltage level when the first transistor is turned on;turning on the second transistor and turning off the first transistor when the corresponding one of the three signals is in a second phase, wherein the each of the three terminals is driven towards a second voltage level when the second transistor is turned on; andturning off the first transistor and the second transistor when the corresponding one of the three signals is in a third phase.