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Apparatus and method for in-system programming of a field programmable logic device using device-specific characterization data

  • US 6,490,714 B1
  • Filed: 11/21/1997
  • Issued: 12/03/2002
  • Est. Priority Date: 11/27/1996
  • Status: Expired due to Term
First Claim
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1. A programmable logic device, comprising:

  • field programmable logic circuits; and

    an internal programming circuit including a memory to store characterization data characterizing programmed voltage values of said field programmable logic circuits as a function of a plurality of program voltage pulse widths, wherein said characterization data is generated based on a measured voltage margin value and a pre-determined slope value that represents a relationship between program voltage pulse widths and program voltage values typical in devices similar to the programmable logic device, and wherein said measured voltage margin value is representative of a measured amount of stored charge of a floating gate of a designated one of the field programmable logic circuits after the designated field programmable logic circuit is programmed at least in part according to one of the plurality of program voltage pulse widths, and a characterization data processor to program said field programmable logic circuits using said characterization data.

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