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AM3358: ELM module

Part Number: AM3358

Hi,

I am working on a project which make use of BCH4 for  error correction. When I am testing the feature of BCH4 by injecting error to NAND flash(trying to introduce 1/2/3/4 errors in data by maintaing same ECC . ELM module should report error locations where bit flip has happened) .

But ELM modle is  reporting uncorrectable errors ,even though number of errors introduced is less than 4bit. According to data sheet ELM reports uncorrectable error only when more than 4 bits has flippped. 

Any help on this is appriciated

GPMC_ECC_CONFIG