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[Keyword] double bit error correcting--single b-bit byte error correcting (DEC-SbEC) codes(1hit)

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  • Random Double Bit Error Correcting--Single b-bit Byte Error Correcting (DEC-SbEC) Codes for Memory Systems

    Ganesan UMANESAN  Eiji FUJIWARA  

     
    LETTER-Coding Theory

      Vol:
    E85-A No:1
      Page(s):
    273-276

    Besides single byte errors which are caused by single chip failures, semiconductor memories used in some applications, such as satellite memory systems, are highly vulnerable to random double bit errors. It is therefore necessary to design Double bit Error Correcting--Single b-bit byte Error Correcting (DEC-SbEC) codes which correct both random double bit errors and single b-bit byte errors. This correspondence proposes a class of generic DEC-SbEC codes that are applicable to computer memory systems using recent high density DRAM chips with wide I/O data, such as, 8, 16 or 32 bits per chip. The proposed DEC-S8EC codes are suitable for memory systems using DRAM chips with 8-bit I/O data, and require 24 check bits for practical information lengths such as 64 and 128 bits.