Video data bus communication system and method

  • US RE38,055 E1
  • Filed: 12/14/1999
  • Issued: 04/01/2003
  • Est. Priority Date: 05/24/1994
  • Status: Expired due to Term
First Claim
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1. A method for communicating video data via a data bus between a master device and a slave device which are each coupled to said bus, comprising the steps of:

  • transmitting from said master device to said data bus a slave address of said slave device and a command;

    generating, at said master device, a KEYCMD signal as a function of said command and a master security key;

    receiving, at said slave device from said data bus, said slave address and said command and recognizing said slave address as corresponding to said slave device;

    generating, at said slave device, an ACK signal as a function of said command and a slave security key;

    transmitting from said slave device to said data bus a master address of said master device and said ACK signal;

    receiving, at said master device from said data bus, said master address and said ACK signal and recognizing said master address as corresponding to said master device;

    comparing said KEYCMD signal generated by said master device with said ACK signal received by said master device; and

    executing a data transfer between said master device and said slave device if said KEYCMD signal corresponds to said ACK signal.

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