Data transfer

摘要

Circuitry for transferring multiple digital data streams, e.g. digital audio data, over a single communications link such as a single wire. A pulse-length-modulator is responsive to a plurality of data streams to generate a series of data pulses with a single data pulse having a rising and falling edge in each of a plurality of transfer periods defined by a first clock signal. The timing of the rising and falling edge of each data pulse is dependent on a combination of the then current data samples from the plurality of data streams. The duration and position of the data pulse in the transfer window in effect defines a data symbol encoding the data. An interface receives the stream of data pulses, and data extraction circuitry samples the data pulse to determine which of the possible data symbols the pulse represents and determines a data value for at least one received data stream.

主权项

1. Digital data transmission circuitry comprising:
at least two data inputs for receiving respective input digital data streams of data bits; and a pulse generator, responsive to said input digital data streams and to a first clock signal, to generate a single data pulse having a rising edge and a falling edge within each of a plurality of transfer periods defined by said first clock signal, wherein the time of occurrence of the rising edge and the falling edge of the data pulse encodes the then current data bits of said input digital data streams.