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Serial data transmission including idle bits

  • US 5,247,657 A
  • Filed: 09/14/1990
  • Issued: 09/21/1993
  • Est. Priority Date: 09/19/1989
  • Status: Expired due to Fees
First Claim
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1. A method of communicating data between first means for processing configured for a control function and second means for processing configured for a slave function over a serial interface;

  • wherein said interface comprises two lines only, a bi-directional data line and a uni-directional clock line;

    said method comprising;

    transmitting a clock signal from said first means for processing over said clock line to said second means for processing, and concurrently carrying out one of the two following functions;

    (1) transmitting one of a control frame and data frame from said first means for processing over said serial interface to said second means for processing; and

    (2) transmitting a data frame from said second means for processing over said serial interface to said first means for processing;

    said method further comprising transmitting as part of each frame a control identification portion for identifying a frame as one of a control frame and a data frame, and transmitting following said control identification potion a plurality of data bits bounded by idle bits, both said first means for processing and said second means for processing freeing said bi-directional data line for a change in direction of data transmission during each said idle bit.

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