ECC is only available for the Nios II/f core and provides ECC support for Nios II internal RAM blocks, such as instruction cache, MMU TLB, and register file. The SECDED ECC algorithm is based on Hamming codes, which detect 1 or 2 bit errors and corrects 1 bit errors. If the Nios II processor does not attempt to correct any errors and only detects them, the ECC algorithm can detect 3 bit errors.
Refer to "ECC" section in the Nios II Core Implementation Details chapter for more information about ECC support in the Nios II/f core.
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