Nonvolatile/battery-backed key in PLD

  • US 6,366,117 B1
  • Filed: 11/28/2000
  • Issued: 04/02/2002
  • Est. Priority Date: 11/28/2000
  • Status: Active Grant
First Claim
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1. A method for configuring a PLD comprising the steps of:

  • loading a decryption key into the PLD;

    placing the decryption key into a state that the decryption key is not erased when external power is removed from the PLD;

    storing an encrypted configuration bitstream in a structure different from the PLD;

    loading the encrypted configuration bitstream into the PLD;

    inside the PLD, decrypting the encrypted configuration bitstream using the decryption key to produce a decrypted bitstream; and

    configuring the PLD using the decrypted bitstream.

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