Method and device for protecting external bus of CPU

Method and device for protecting external bus of CPU

CN
  • CN 1,318,973 C
  • Filed: 10/31/2003
  • Issued: 05/30/2007
  • Est. Priority Date: 10/31/2003
  • Status: Active Grant
First Claim
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1. the guard method of a CPU external bus may further comprise the steps:

  • CPU judges the size desire to read and write data, and judges the corresponding access time to the control veneer in view of the above, and the corresponding initial value that counter is set, described counter from counting begin to the time of overflowing greater than the access time of CPU to described control veneer;

    Described counter begins counting, and the while output level overturns, and the sheet choosing output of the control chip on the described control veneer is started unlatching;

    CPU sends read write command to described control chip, and control chip is carried out this read write command;

    Described rolling counters forward finishes, and the sheet choosing output startup of the control chip on the described control veneer is closed in the output level upset;

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