Question

Compare and contrast CISC architecture with RISC architecture.

Answer 1

Here is your answer

1)

RISC is reduced instruction set computer is a computer which only uses simple commands that can be divided into several
instructions which achieve low-level operation within a single CLK cycle.

CISC complex instruction set computer is a computer where single instructions can perform numerous low-level operations
like a load from memory, an arithmetic operation, and a memory store or are accomplished by multi-step processes or
addressing modes in single instructions.

2)

RISC processors have simple instructions taking about one clock cycle. The average clock cycle per instruction (CPI) is 1.5.

CSIC processor has complex instructions that take up multiple clocks for execution. The average clock cycle per instruction
(CPI) is in the range of 2 and 15.

3)

RISC systam has no memory unit and uses a separate hardware to implement instructions.
CISC has a memory unit to implement complex instructions.

4)

In RISC the instruction set is reduced i.e. it has only a few instructions in the instruction set. Many of these instructions
are very primitive.

In CISC the instruction set has a variety of different instructions that can be used for complex operations.

5)
RISC hase multiple register set.
In CISC only has single register set.

6)

RISC porcessors are highly pipelined
In CISC processes are normally not or less pipelined

7)

RISC has very high execution time compared to CISC
CISC has less execution time

8)

RISC architecture is used in high-end applications such as video processing, telecommunications and image processing.
CISC architecture is used in low-end applications such as security systems, home automation, etc.

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