RAM Input Read/ write Memor enable 4-to-16 Word select Decoder 0 RAM cell A2 23456789012345 RAM cell RAM cell Read/Write logic put Data out output Read/ Bit Write select Chip select16x1 RAM A3 A2 A1 A0 Data output Data input Read/ write Memory enable RAM cell RAM cell RAM cell Read/Write logic Data in Data out Read/ Write Bit select Data input Data output Chip select Read/Write Word select 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 23 22 21 20 4-to-16 Decoder A3 A2 A1 A0