CISC and RISC processors

What is a microprocessor?

• Device for data transmission

• Device for data output

• Device for data processing

• Device for data storage

What is the main idea behind Reduced Instruction Set Architecture (RISC)?

• To simplify hardware by using a few basic steps for loading, evaluating, and storing operations

• To make a single instruction do all loading, evaluating, and storing operations

• To have complex addressing modes

• To increase the number of general-purpose registers

What is the main idea behind Complex Instruction Set Architecture (CISC)?

• To simplify hardware by using a few basic steps for loading, evaluating, and storing operations

• To make a single instruction do all loading, evaluating, and storing operations

• To increase the number of general-purpose registers

• To have complex addressing modes

What is the advantage of RISC processors over CISC processors?

• Faster execution

• More memory efficient

• Reduced code size

• Widely used

What is the advantage of CISC processors over RISC processors?

• Reduced code size

• More memory efficient

• Faster execution

• Widely used

What determines how fast a single instruction can be executed in a processor?

• Number of general-purpose registers

• Instruction set

• System clock speed

• Word length

What is the characteristic of RISC processors regarding instruction decoding?

• Complex instruction, hence complex instruction decoding

• Instruction may take more than a single clock cycle to get executed

• Instructions are larger than one-word size

• Simpler instruction, hence simple instruction decoding

What is the characteristic of CISC processors regarding instruction decoding?

• Complex instruction, hence complex instruction decoding

• Instruction may take more than a single clock cycle to get executed

• Simpler instruction, hence simple instruction decoding

• Instructions are larger than one-word size

What are the disadvantages of RISC processors?

• More complex design

• Increased memory usage

• More instructions required

• Simpler instructions

What are the disadvantages of CISC processors?

• More instructions required

• Increased memory usage

• More complex design

• Higher power consumption