AN $8$ bit cpu with memory in ;ogiObjectives

Learn the basic CPU structure and Organization

Learn Memory, Registers, Tri$-$state Buffers and Decoders

Build an $8-$bit CPU with a memory

The best way to learn about microprocessors is to build one. In this lab, you are going to build an $8-$bit CPU in Logisim.

Through the building process, you will learn the CPU organization and learn how to use the memory.

Describing the CPU structure

In the above design$/$diagram$,$ the following components have been added:

Program counter, use an $8-$bit register for it

PC$+1$ can be implemented by using an $8-$bit ADDER to add a constant $69696991$ to the PC$.$

$.$ MAR $-$ memory address register

MEM $-8-$bit memory

By now you have enough knowledge to build an $8-$bit CPU without a memory.

We are going to introduce the memory below so that you will have enough knowledge to implement the above design.