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Mask-programmed read-only memory with reserved space

  • US 8,885,384 B2
  • Filed: 03/18/2013
  • Issued: 11/11/2014
  • Est. Priority Date: 01/11/2007
  • Status: Expired due to Fees
First Claim
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1. A mask-programmed read-only memory (mask- ROM) family, comprising:

  • a first mask-ROM die comprising at least a first memory array;

    a second mask-ROM die comprising at least a second memory array;

    wherein said first and second memory arrays are same except for a reserved portion, said reserved portion comprising a same plurality of mask-ROM cells in said first and second memory arrays, wherein all mask-ROM cells in the reserved portion of said first memory array have a same structure, and the mask-ROM cells in the reserved portion of said second memory array have at least two structures.

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