CPU TOWN AND DA FDE cycle
Storyboard Szöveg
- Welcome to Computer 319876352, and this is the CPU. The address you need is at 329 Data Street. I am the program counter !
- Fetch
- Okie Dokie, off we go!
- Okay, the contents are 010101011100010101.
- Fetch
- Cheers Bus, I have no idea what his means but I'll take it anyway. Can you call the Address Bus please. I am the Memory Address Register.
- Instruction 5,564,322,402
- I've got the address from main memory and brought it back to, the Memory Data Register.
- Fetch
- Thanks, I'll pass this to the Current Instruction Register.
- Decode/Execute
- I'm the Current Instruction Register. I hold the instruction while the CU ( Control Unit) deciphers it.
- Eureka, it all makes sense now! As its maths-y , I'll call the data bus and pass it to the ALU!
- I case you want to know, the instruction is split into an OP-Code ( the actual instruction) and a Operand (the value, memory address).The instruction is ADD 6
- Thanks Data bus, I'll ADD 6. Now, the accumulator gets to store the result. And that's it...totallyyy. just ask OCR.
- Decode/ Execute
- YAY, one more instruction for met to hold. And that's the end... just ask OCR. Now 3,2,1 REPEAT!
- If you want to be a smarty-pants, if the instruction wasn't maths-y, it would have been loaded into memory or saved there in another mini-loop.If you want to be a smarty-pants, if the instruction wasn't maths-y, it would have been loaded into memory or saved there in another mini-loop.
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