DOUBLE STRUCTURE SWITCHING SYSTEM OF STORAGE DEVICE

摘要

PURPOSE:To decrease the hard quantity of an address changing function and to improve the yield of a storge device, by changing the combination of the storage cell arrays which are converted to a double structure. CONSTITUTION:The storage cell arrays 1 and 2 are divided into 2R<+d>C<-2> (dR>=1 and dR+dC>=3) units of arrays repsectively. Then the address is provided so that the hamming distance between optional two row addresses contained in each divided array is larger than dR and at the same time the hamming distance between two optional column addresses is larger than dC. Then one of the address information of one optional dR-1 (dR>=2) bits of the row address information of plural bits supplied to the arrays 1 and 2 and the address information of an optional dC-1 (dC>=2) bits of the column address information of plural bits supplied to the arrays 1 and 2 is inverted. Then the combination of the arrays to be converted to a double structure is selected in optional 2R<+d>C<-2> ways.