A method of using non-data bits of the memory device as data bits is comprised of the steps of determining which bits in the memory device are nonfunctional and which bits are functional. If any of the data bits is nonfunctional, the second step of the method is to connect a non-data bit to a data...http://www.google.com.tw/patents/US5729497?utm_source=gb-gplus-share專利 US5729497 - Method of using parity and ECC bits to increase the yield of non-parity ECC devices 
