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The CCN-502 implements byte parity protection on all data buses and data storage, as well as parity generation and checking for sources and endpoints of data within CCN-502.
The sources of data include L3 cache read data and all RN-F DAT VC inputs, that is, write data and snoop response data.
The data endpoints include L3 cache write data and RN-F DAT VC outputs, that is, read data.
In addition, byte parity information is propagated to all the RN-I, HN-I, and SBSX RDATA and WDATA interfaces, using the RUSER and WUSER signals.