OCR J277 1.1.1 CPU Architecture

The CPU is the _____ of the computer.

Inside the CPU, you will find:

• ALU, CU, registers, cache memory

• ADU, PC, storage, RAM memory

• ARM, PC, controller, cache memory

• APM, CU, time signal, RAM memory

The ALU....

• does any maths or logic problems for the CPU

• stores data inside the CPU

• sends out control signals for the CPU

• holds specific data for the fetch-decode-execute cycle

The CU...

• does any maths or logic problems for the CPU

• stores data inside the CPU

• sends out control signals for the CPU

• holds specific data for the fetch-decode-execute cycle

The cache memory...

• does any maths or logic problems for the CPU

• stores frequently used instructions close to the CPU

• sends out control signals for the CPU

• holds specific data for the fetch-decode-execute cycle

The registers...

• do any maths or logic problems for the CPU

• store data inside the CPU

• send out control signals for the CPU

• hold specific data for the fetch-decode-execute cycle

The MAR stores the _______ of data which is either being sent to or fetched from the RAM.

The MDR holds the ____ which is being sent to/fetched from the address in the MAR.

The PC holds the address of the next ___________ which will be fetched.

The PC is ___________ by 1 at the end of each fetch-decode-execute cycle.