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Communication system for driving pairs of twisted pair links

  • US 7,123,578 B2
  • Filed: 09/19/2002
  • Issued: 10/17/2006
  • Est. Priority Date: 07/11/1996
  • Status: Expired due to Fees
First Claim
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1. A communications interface comprising;

  • output circuitry for providing a data signal for transmittal under control of a spread spectrum transmit clock signal; and

    a clock source for generating the spectrum transmit clock signal which is continuously variable between upper and lower frequency values,wherein the output circuitry is operable to provide two parallel outputs, one parallel output being said data signal, and another parallel output being a strobe signal and including strobe generation circuitry, wherein the data signal comprises a serial bit pattern and the strobe generation circuitry generates the strobe signal such that the strobe signal has signal transitions only at bit boundaries where there is no transition on the data signal, the strobe generation circuitry being controlled by the clock signal such that for each clock pulse where there is no signal transition in the data signal a signal transition is generated in the strobe signal.

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