if0≤ index+step<BK: index index step else if index+step≥BK index index step-BK else if index step< 0 index= index+ step+ BK Address Data 15 N N-1 0 Top of circular buffer Effective base H HO Element o Element 1 ARx H HL L- Element(n LSBs of ARx 15 N N-1 Last element H LSBS BK Last element +1if 0≤ index+step < BK: index = index + step else if index + step ≥ BK: index = index + step - BK else if index + step< 0 index = index + step + BK