This document discusses the organization of a processor and its components. It describes the bus organization, scratchpad memory, accumulator register, arithmetic logic unit (ALU), and status register. The ALU can perform basic arithmetic and logical operations on data. The design of the ALU involves separate arithmetic and logic circuits that are later combined to perform both types of operations based on a function table and selection lines.

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