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Byte parity checking is performed at the CCN-502 interface for all DAT flits that target RN‑Fs, and the CCN-502 generates a DAT flit Data Error response when it detects a parity error. In addition, error information is logged in the XP Error Syndrome 0 register.
Byte parity is also checked on L3 fill data. If the CCN-502 detects a parity error, it modifies the ECC data for the fill so that a double-bit ECC error occurs on the next read of that cacheline. In addition, error information is logged in the HN‑F Error Syndrome 1 register.