Digital Electronics: Principles, Devices and Applications

636 Digital ElectronicsAB24AB23AddressBusAB0WEA 23 A 0A 23A 0WECS16MBRAM-1WECS16MBRAM-2I/O 7 I/O 0I/O 7 I/O 0DB7DB6DB5DB4DB3DB2DB1DB0DataBusFigure 15.24 Solution to example 15.3.• This gives us a capacity of 16 × 8.• Now, for address inputs (00010000) 2 to (00011111) 2 , RAM-3 and RAM-4 are selected.• Similarly, RAM-3 and RAM-4 respectively store four upper bits and four lower bits of data wordscorresponding to these address inputs.• This again gives a capacity of 16 × 8.• Thus, the overall capacity is 32 × 8.• The word size is 8.