30 May 2017 Tue A.N. (B) Computer Organization and Architecture

1. MODULE –V
PART2
PROCESSOR ORGANIZATION

2. Contents
• Processor Organization
– Bus Organization
– Scratchpad memory
– Accumulator register
• Arithmetic Logic Unit
• Design of Arithmetic Circuit
• Design of Logic Circuit
• Design of Arithmetic logic unit
• Status Register
• Design of Shifter

3. • Processor Organization
– The processor part of a computer CPU is referred to the
data path of the CPU because the processor forms the
path for the data transfer between the registers in the
unit.
• Methods of processor Organization
– Bus Organization
– Scratchpad memory
• Two port memory
– Accumulator register

4. BUS ORGANIZATION

5. SCRATCHPAD MEMORY

6. Processor unit with a two port memory

7. Accumulator Register

8. Arithmetic and Logic Unit
• Is a multioperation, combinational logic digital
function.
• Perform
– a set of basic arithmetic operations
– Set of logical operations
• No. Of selection lines(to select a particular
operation).
• K selection variables->2k distinct operations.

9. 4 bit ALU

10. • Design of ALU will be carried out in 3stages:
– Design of arithmetic section
– Design of logic section
– The arithmetic section will be modified so that it
can perform both arithmetic and logic operations.

11. Design of Arithmetic unit

14. 4bit adder/subtractor circuit

15. Design of LogiC Circuit

16. Combining Logic & Arithmetic Circuits

17. Function Table

19. Design of Arithmetic & Logic Circuit

20. Design of Arithmetic & Logic Circuit

21. • When S2=0

22. • When s2=1

23. Function Table