For write-through cache case, we assume that L1 data cache adopts parity code and L2 cache is protected by SECDED (single error correction double error detection). The write buffer resides between L1 data and L2 caches. Basic update and release mechanisms of CWV are same as in the write-back cache case but CWV update is actually performed when the write buffer evicts an entry which writes
data to L2 cache