Fetch decode execute cycle

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The fetch, decode, execute cycle of a CPU for Computer science GCSE

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Thanks for this I have a test tomorrow and my computer science teacher is useless so this helped a lot

Mike_Oxmaul

Beautifully explained. I was struggling with learning fetch-decode-execute cycle. Your tutorial has cleared up my confusion. Thanks for the lessons.
I will now have to watch this video three or four times just so to commit this to memory.
Just subscribed.

pinklady

Thanks a lot ❤for ur explanation
From srilanka😊

FathimaFathima-lkon

Just a masterpiece⭐⭐⭐. Finally unnderstood it because of you. Thank youuuu😊😊😊

priyodarshibarua

Wow, this is the best thing ever! Thank you.

Naz-yibs

I'm entranced by this. I had the pleasure of reading something similar, and I was truly entranced. "The Art of Meaningful Relationships in the 21st Century" by Leo Flint

John-

got my CS mock tmr im absolutely finished😭

kmrii

I watched and read about it many times, but now I finally got it. Thank you :)

noraomar

Great explanations in an easy and understandable way. Thanks Sir!

bagaboleomike

Well done thanks for the nice explanation.

JP-programming

Great video but CU and ALU weren't mentioned :/
Especially at 1.5 speed!

Funderpanda

So am I correct that:
1)The program is started from an input device and the command travels along the Control Bus to the CU.
2) The Control Unit then contacts the PC along the CPU bus. It moves the counter to MAR (and increments the PC), goes along the address bus to RAM, 'fetches' the contents of the address, transfers the contents back along the data bus and stores it in MDR. That is the Fetch part completed.
3) Then the Control Unit continues to work in Decode. The CU transfers the contents of MDR to IR, which decodes the contents and puts the decoded data into the Accumulator. That is the end of the Decode part.
4)Then the Execute starts. The ALU then performs the arithmetic or logic and sends the output along the data bus to the output device. That is the end of the Execute part.

davet

Nicely explained. Could you explain how do CU and ALU take part of this process? What do they do when this process happen?

dev.shafkhan

brilliant! So well explained! I finally get it all! Thank you! :)

hanwong

Very helpful of the order of the cycle however how are the CU and ALU involved? I assume the control unit just controls this whole process and tells the CPU as a whole what to do? And the arithmetic logic unit fetches the instruction from the instruction register and does the instruction(adding)?

jupiterjames-reynolds

absolute banger of a little wee film here. keep cracking!

markcalderwood

All jokes aside (And immaturity from my classmates), this was a useful video. Thanks.

minusjos

Hi Sir. How can we access to the data in memory location 4 without informing the Memory address register. I think that after decoding the 1st instruction, the MAR gets 4 then data is fetched and put in accumulator. Then We look up PC we find 1, which will be copied in MAR to serach for the next instruction.

tahaait

A good sketch to explain but inconsistent in using the memory and Data registers.

fawzisdudah

Please use mic for explanation for better audio quality

mahapol

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