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DETECTION OF UNCORRECTABLE RE-GROWN FUSES IN A MICROPROCESSOR

  • US 20110035616A1
  • Filed: 03/08/2010
  • Published: 02/10/2011
  • Est. Priority Date: 08/07/2009
  • Status: Active Grant
First Claim
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1. A microprocessor, comprising:

  • a first plurality of fuses, a predetermined number of which are selectively blown, wherein control values are provided from the first plurality of fuses to circuits of the microprocessor to control operation of the microprocessor; and

    a second plurality of fuses, blown with the predetermined number of the first plurality of fuses that are blown;

    wherein, in response to being reset, the microprocessor is configured to;

    read the first plurality of fuses and count a number of them that are blown;

    read the predetermined number from the second plurality of fuses;

    compare the counted number with the predetermined number read from the second plurality of fuses; and

    prevent itself from fetching and executing user program instructions if the number counted from reading the first plurality of fuses does not equal the predetermined number read from the second plurality of fuses.

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