Apparatus for automatic initiation of data transmission

  • US 5,434,872 A
  • Filed: 07/28/1992
  • Issued: 07/18/1995
  • Est. Priority Date: 07/28/1992
  • Status: Expired due to Term
First Claim
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1. For a system transmitting frames of data across a communications medium;

  • an apparatus comprising;

    buffer memory for storing data of frames composed by the host computer for transmission on the communications medium;

    means, having a host system interface, for transferring data of frames to the buffer memory;

    means, coupled with the buffer memory, for monitoring the transferring of data of a frame to the buffer memory to make a threshold determination of an amount of data of the frame transferred to the buffer memory;

    means, responsive to the threshold determination of the means for monitoring, for initiating transmission of the frame prior to transfer of all the data of the frame to the buffer memory from the host computer;

    transmit logic, responsive to the means for initiating transmission, for retrieving data from the buffer memory and supplying retrieved data for transmission on the communications medium; and

    underrun control logic, which detects a condition in which the means for transferring falls behind the transmit logic, and supplies a bad frame signal to the communications medium in response to the underrun condition.

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