<d, J is a positive integer and J<N, N=D/B=2d-b, and P=N???L/J and P and L are positive integers; and wherein said W(1+J/N) words???D bits memory configuration is divided into (P+L) memory address areas A1, A2, . . . , AP+L, so that each memory address area comprises N element address areas, only one of which comes from a corresponding memory unit. 3.