Question

Computer Architecture

1.The C in CPU stands for what word?

2.The P in CPU stands for what word?

3.The U in CPU stands for what word?

4.What are the 3 major components of the CPU?

Answer 1

1.The C in CPU stands for what word?

Ans - C stands for Central

2.The P in CPU stands for what word?

Ans - P stands for Processing

3.The U in CPU stands for what word?

Ans - U stands for Unit

CPU - Central Processing Unit

4.What are the 3 major components of the CPU?

CPU is very important part of the computer. As humans has brain computer has CPU. CPU is brain of the computer.

Three important components of the CPU are Memory Unit, Arithmetic Logic Unit and Control Unit

a- Memory Unit

Memory unit means RAM of the computer. RAM stands for Random access memory. The size of the RAM plays very important role in CPU. RAM is the primary memory that is accessible to CPU. Whenever someone describes the specification of computer/laptop then he/she always mention about the RAM. The performance, speed and power, processing capacity is majorly depends on the RAM.

Higher RAM CPU provides good/fast/efficient performance. Input and output are done through the memory unit. All requests processed through the RAM and data of those instructions are stored in the memory unit. Data stored on memory lasts till CPU is on once it is turned off the stored data on the memory will be removed. Whatever data stored on RAM is temporary storage. RAM is volatile memory. There are slots for RAM in CPU. RAM can be increased by adding additional RAM to the dedicated slots. There are different types of RAM which are DDR1, DDR2, DDR3 and DDR4.

ROM is also another type of memory stands for Read Only Memory. Data does not lost from ROM so this is called non-volatile memory. Data stays on ROM even the CPU is turned/switched off.

b- Arithmetic Logic Unit (ALU)

Arithmetic logic unit is also called as ALU. This unit is useful for arithmetic and logical operations. ALU is digital circuit. Name itself tells that this consist of two different parts i.e. Arithmetic part and Logical part.

As we know arithmetic operations means Addition, subtraction, multiplication and division. This kind of operation are done by Arithmetic unit. Other complex orations also done by arithmetic unit with the help of all this operation.

Logical unit do the operation like select, compare and merge. These are the logical operations. e.g. If you need to check which number is greater between 2 and 5. So here logic unit do the comparison and decide which one is greater. Logical operations are AND, OR, NOT, NOR.

Calculations needed by CPU is done by the ALU. Good design of the ALU makes your CPU more powerful. Powerful ALU generates faster result which result in high heat generation and energy consumption.

c- Control Unit (CU)

Control unit is controlling all the operations done by all the parts of the CPU. It just controls and does not have to do anything with data processing. It helps to transfer instructions from one unit to another unit of the CPU.

Control unit controls the data flow of the processor. Control unit helps in handling the multitasking operations.

Control unit takes an instruction from main memory. Further control unit executes that instruction and during that process it takes help from arithmetic logical unit based on logical or arithmetic requirement. Once the first instruction is completed then it takes the new instruction for processing. This process continues until program is completed. Once entire program is completed user can see output through output devices.

Control unit takes instruction from main memory and passes to the ALU as commands. ALU will execute those commands. ALU will store the result of the commands to the memory. So, cycle is like

Main Memory to Control unit to ALU and again to Main memory.