All About Instruction Set
What is Instruction Set
Why Instruction Set
How Instruction Set Work
Where Instruction Set Stored
➤The instruction set is hardwired into the CPU…it’s actually a result of the way the circuit is built, there isn’t an actual space where the instructions are kept. When a computer starts, there’s a small program on a ROM that knows how to initialize all the components and boot the OS.
➤ An instruction set is the set of machine code instructions that the CPU is built to handle. The CPU doesn’t have to load it from anywhere, it’s built-in to the CPU itself. Examples of instruction sets are: Intel x86, MIPS.
➤instruction set is stored in the control unit .
Control unit is a hardware logic circuit which indeed is a silicon chip ( semiconductor device ), designed in such a way that it responds to certain inputs (memory instructions ) to produce meaningful control signals for the other CPU components .
The whole process appears as if the control unit had certain definitions stored in itself which tells it what to do when a memory instruction arrives .
And indeed it has those definitions stored in form of hardware logic circuits this image may help you to visualize and understand .
Its a demonstration image of a concept processor’s(Morris mano) control unit .
Here visualize how the input comes in form of Op0-Op5 (6 bit instruction (every machine instruction has a binary code and that’s how it is worked upon in a processor ) )
and then it is translated by the control logic circuit into meaningful signals .
This circuit here is the stored instruction set.
