1. Computer Organization and Design
CSE211
Computer Organization and Design
Lecture : Tutorial: Practical: Credit: 4
Deepak Kumar
(Asst. Professor, LPU)

2. Overview Register Transfer Language Register Transfer
Register Transfer and Micro-operations
Overview
Register Transfer Language
Register Transfer
Bus and Memory Transfers
Arithmetic Micro-operations
Logic Micro-operations
Shift Micro-operations
Arithmetic Logic Shift Unit
CSE 211

3. MICROOPERATIONS Computer system microoperations are of four types:
Register Transfer and Micro-operations
MICROOPERATIONS
Computer system microoperations are of four types:
Register transfer microoperations
Arithmetic microoperations
Logic microoperations
Shift microoperations
CSE 211

4. Arithmetic MICROOPERATIONS
Register Transfer and Micro-operations
Arithmetic MICROOPERATIONS
The basic arithmetic microoperations are
Addition
Subtraction
Increment
Decrement
The additional arithmetic microoperations are
Add with carry
Subtract with borrow
Transfer/Load
etc. …
Summary of Typical Arithmetic Micro-Operations
R3  R1 + R2 Contents of R1 plus R2 transferred to R3
R3  R1 - R2 Contents of R1 minus R2 transferred to R3
R2  R2’ Complement the contents of R2
R2  R2’ 's complement the contents of R2 (negate)
R3  R1 + R2’+ 1 subtraction
R1  R Increment
R1  R Decrement
CSE 211

5. Register Transfer and Micro-operations 5
Binary Adder
CSE 211

6. Binary Adder-Subtractor
Register Transfer and Micro-operations
Binary Adder-Subtractor
Binary Adder-Subtractor
Mode input M controls the operation
M= adder
M= subtractor
CSE 211

7. Binary Incrementer Binary Incrementer
Register Transfer and Micro-operations
Binary Incrementer
Binary Incrementer
CSE 211

8. Arithmetic Circuits Register Transfer and Micro-operations 8 FA 4x1
Cin S1 S0 1 2 3
4x1
MUX X0 Y0 C0 C1 D0 FA X1 Y1 C2 D1 X2 Y2 C3 D2 X3 Y3 C4 D3
Cout A0 B0 A1 B1 A2 B2 A3 B3
CSE 211

9. Any Questions?