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Secured coprocessor comprising means for preventing access to a unit of the coprocessor

  • US 20060265570A1
  • Filed: 04/05/2006
  • Published: 11/23/2006
  • Est. Priority Date: 04/05/2005
  • Status: Active Grant
First Claim
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1. A method for monitoring an execution of a command by a coprocessor, the method comprising:

  • producing, at a start of the execution of the command, an error signal having an active value;

    during the execution of the command, monitoring operation of the coprocessor so as to detect any abnormal progress in the execution of the command;

    at an end of the execution of the command, taking the error signal to an inactive value unless any abnormal progress in the execution of the command has been detected; and

    preventing access to at least one unit to be protected of the coprocessor, while the error signal is on the active value.

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