Digital Systems: Principles and Design

We have learnt in Chapter 13 that a memory stores the look-up tables for the bits or bytes

at the outputs for each of the inputs, called address inputs. A ROM with 10 address input

lines has 2

10

addresses and each address there are 8 bits in a 1 k ´ 8 ROM (1 k = 1024 for

the purpose of memory space representation). Also a complex combinational circuit can

be easily assembled by the programmable logic memories (ROM, EPROM, EEPROM or

Flash or OTP). ROM is non-volatile memory (retains the bits even after power-off).

We will learn an important form of semiconductor memory called RAM in this chapter.

Concept of address and data buses is important for