RISC and CISC Processors
RISC (Reduced Instruction Set Computer) Processor
RISC is known as Reduced instruction Set Computer. It is a type of microprocessor that has limited number of instructions. It can execute it's instructions very fast because instructions are very small and simple.
RISC chips require fewer transistors which make them cheaper to design and produce. Most Instructions complete in one cycle, which allows the processor to handle many instructions at same time. In this type of processor, instructions are register based and data transfer takes place from register to register.
Features of RISC- Simple and small instruction
- Instruction come under size of one word
- Instruction take single clock cycle to get executed
- Simple addressing modes
- Less data types
- Pipeline can be achieved
- More number of general purpose register
CISC (Complex Instruction Set Computer) Processor
CISC is known as Complex Instruction Set Computer. It was first developed by Intel corporation. It contains large number of complex instructions. In this processor instructions are not register based and instructions cannot be completed in one machine cycle. Data transform is from memory to memory. Micro programmed control unit is found in CISC. It also have variable instruction format.
Features of CISC
- Complex instruction, hence complex instruction decoding
- Instruction may take more than single clock cycle to get executed
- Instruction are larger than one word size
- Complex addressing mode
- More data types
Difference Between CISC and RISC
| RISC | CISC |
|---|---|
|
|