Difference between CISC and RISC
CISC: Complex Instruction Set Computer
- Instruction size and format: Large set of instructions with variable formats (16-64 bits per instruction)
- Data transfer: Memory to memory
- CPU Control: Most micro coded using control memory (ROM) but modern CISC use hardwired control.
- Instruction Key: Not register based instructions.
- Memory access: More memory access
- Clocks: Include multi clocks
- Instruction nature: Instructions are complex and simple.
- Examples: Intel architecture, AMD

RISC : Reduced
Instruction Set Computer
- Instruction size and format: Small set of instructions with fixed format (32 bit)
- Data transfer: Register to Register
- CPU Control: Mostly hardwired without control memory.
- Instruction Key: Register based instructions
- Memory access: Less memory access
- Clocks: Includes single clock.
- Instruction nature: Instructions are reduced
- Examples: SPARC, POWER PC
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