On these slides I describe all the detail about RISC and CISC Processors.

1. CISC & RISC

2. BY: Adeel Rasheed

3. What is CISC?
 A computer with a large number of instructions is
classified as a Complex Instruction set Computer,
abbreviated CISC
What is RISC?
 RISC, or Reduced Instruction Set Computer. is a type
of microprocessor architecture that utilizes a small,
highly-optimized set of instructions, rather than a
more specialized set of instructions often found in
other types of architectures.

4. History
The first RISC projects came from IBM, Stanford,
and UC-Berkeley in the late 70s and early 80s.
The IBM 801, Stanford MIPS, and Berkeley RISC 1
and 2 were all designed with a similar philosophy
 NEXT Invent CISC. For more Complex instructions.

5. Characteristics of RISC Processor
 Register to Register "LOAD" & "STORE" are
independent instructions.
 Relatively few addressing modes.
 All operations done within the registers of the CPU
 Fixed-Length, Easily decoded instruction format
 Single-Cycle instruction execution

6. Characteristics of CISC Processor
Emphasis on Hardware.
Includes multi-clock complex instructions.
Memory-to-memory “LOAD” and “STORE”
incorporated in instructions.
Small code size, high cycles per second

7. RISC & CISC Approaches
The CISC Approach
The RISC Approach

8. Overlapped Register Windows
 Global Register
 Local Register
 Overlapped Register