If a system's instruction set consists of an 6-bit opcode, what is the maximum number of instructions the system can have? Explain why.

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter4: Processor Technology And Architecture
Section: Chapter Questions
Problem 17VE: A(n) ____________________ instruction copies data from one memory location to another.
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If a system's instruction set consists of an 6-bit opcode, what is the maximum number of instructions the system can have? Explain why.

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Explanation

1) An opcode (abbreviated from operation code) is the portion of a machine language instruction that specifies the operation to be performed.

2) Every processor/controller has its own set of opcodes defined in its architecture which tells the hardware what operation needs to be performed with this instruction. 

3) So having 6 bits for the opcode means only that you are able to encode up to 26=64 different instructions which can be interpreted in a single decode cycle

4) So if a system's instruction set consists of an 6-bit opcode, 64 maximum number of instructions the system can have

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