Hierarchical design , layout, design abstraction , HDLA, abstraction layout of inverter circuit, advantages of hierarchical design and design hierarchy

1. Hierarchical Design
and
Design Abstraction
Prepared By
K. M. Sayem Bin Rahmotullah
Roll 160515

2. Complexity and Design
Creating a design team provides a
realistic approach to approaching a
VLSI project, as it allows each
person to study small sections of the
system
1. Needing hundreds of engineers,
scientists, and technicians
2. Needing hierarchy design and
many different Level View
3. Everyone of each level depends
upon the Computer-Aided Design
(CAD) tools

3. Hierarchy

4. Design Hierarchy
 System specifications: is defined in both general
and specific terms, such as functions, speed, size, etc.
 Abstract high-level model: contains information on
the behavior of each block and the interaction among
the blocks in the system
 Logic synthesis: To provide the logic design of the
network by specifying the primitive gates and units
needed to build each unit
 Circuit design: where transistors are used as
switches and Boolean variables are treated as vary
voltage signals
 Physical design: the network is built on a tiny area on
a slice of silicon
 Manufacturing: a completed design process is moved

5. Physical Design Consists Of
 Floor Planning
 Placement
 Routing

6. Advantages of Hierarchy
Design
 Organizes the large number of
transistors.
 Easy to summarize functions.
 Easier to reuse the pieces .

7. Design Abstraction
Design Abstraction is the hardware
system design .
Example : Logic Gates (simplification of
non linear circuits expect boolean
values)

8. Goals Of Design Abstraction
1. Speed
2. Power Consumption
3. Size Comparison .

9. Abstraction Layout
Layou
tStick
Diagram
Transisto
r Level
Form

10. Stick Diagram
Stick diagrams are a means of
capturing topography and layer
information using simple diagrams.

11. Stick Diagram Rules

12. Stick Diagram Rules

13. Stick Diagram Rules

14. Stick Diagram Does not Consists
 Exact position
 Transistor Size
 Wire length/width
 Parasitic components.

15. Hardware Description
Language Abstraction

16. Circuit

17. Logic Gates

18. Resistor Transfer Level

19. Algorithm

20. System

21. Design Paradigm

22. The design representation space consists o
domains and levels
Behavioral domain most abstract
Structural domain specifies the architecture
Physical domain include the transistors and
layout

23. Domain

24. That’s all for Today’s
Presentation

25. Thank You