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1edited Jul 22, 2015 at 22:05Although the question seems a bit vague, I'll risk an answer and maybe generate a useful discussion.
Question 1: When do we pack two registers together? How does the system know it's not one register coded into 4 bits? Could you please give me an example?
The ID (Instruction Decoder) in the CPU will read the opcode first. This means that once it knows the instruction it has to decode, it knows how to interpret the following bits. You can code your registers on 4 bits, meaning that you have 16 registers. But imagine you have an instruction that i...
Content Under CC-BY-SA license How does an instruction decoder work? - Stack Overflow
The ID (Instruction Decoder) in the CPU will read the opcode first. This means that once it knows the instruction it has to decode, it knows how to interpret the following bits . You can code your …
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What the decoding stage does is to map these numbers to the actual action of the instruction. This often involves looking up the OP-code in a data-structure, for instance a ROM. You could …
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