CETPA INFOTECH PVT LTD is one of the IT education and training service provider brands of India that is preferably working in 3 most important domains. It includes IT Training services, software and embedded product development and consulting services. http://www.cetpainfotech.com

1. A market leader in the field of technical training is glad to
organize a seminar on VLSI Design (VHDL) to shape the career
of bright students and to turn them into a great engineer. We
hope to have a good time with you..!!!
Your concern and co-operation is highly valuable to us.
___________
Team CETPA

3. *The above two are considered as a very difficult
tasks in the field of electronics engineering, where
in fact it’s a very simple technology.

4.  VHDL is for coding models of a digital system.
 Reasons for modeling:
◦ Requirements specification
◦ Documentation
◦ Testing using simulation
◦ Formal verification
◦ Synthesis
 Goal:
◦ Most ‘reliable’ design process, with minimum cost
and time
◦ Avoid design errors!

5.  VHDL is a programming language that allows one
to model and develop complex digital systems in a
dynamic environment.
 Object Oriented methodology for you C people can
be observed -- modules can be used and reused.
 Allows you to designate in/out ports (bits) and
specify behavior or response of the system.

6.  C is procedural language whereas VHDL is semi
concurrent & semi sequential language.
 C is Case Sensitive whereas VHDL is case
insensitive.
 There are some similarities, as with any
programming language, but syntax and logic are
quite different.

7. • Interfaces (PORTS)
• Behavior
• Structure
• Test Benches
• Simulation
• Synthesis

8. Dataflow
Behavioral
Structural
Kind of BORING sounding huh??
Well, it gets more exciting with the details !!
:)

9. Uses statements that defines the actual
flow of data.....
such as,
x <= y -- this is NOT less than equal to
-- told you its not C
this assigns the Boolean signal x to the value of
Boolean signal y... i.e. x = y
this will occur whenever y changes....

10. Entity declaration…
(Describes the input/output ports of a module)
entity name port names port mode (direction)
entity reg4 is
port ( d0, d1, d2, d3, en, clk : in bit;
q0, q1, q2, q3 : out bit );
end entity reg4;
punctuation
port type
reserved words

11.  Architecture body
 Describes an implementation of an entity
 May be several per entity
 Behavioral architecture
 Describes the algorithm performed by the
module
 Contains
Process statements, each containing
 Sequential statements, including
Signal assignment statements and
Wait statements

12.  Omit entity at end of entity declaration.
 Omit architecture at end of architecture body.
 Omit is in process statement header.
entity reg4 is architecture behav of reg4 is
port ( d0, d1, d2 : in bit begin
d3, en, clk : in bit; process (d0, ... )
q0, q1, q2, q3 : out bit ...
); begin
end reg4; ...
end process ;
end behav;

13.  Structural architecture
implements the module as a composition of
subsystems
contains
○ signal declarations, for internal interconnections
the entity ports are also treated as signals
○ component instances
instances of previously declared entity/architecture pairs
○ port maps in component instances
connect signals to component ports

14.  An architecture can contain both behavioral
and structural parts
Process statements and component instances
○ Collectively called concurrent statements
Processes can read and assign to signals
 Example: register-transfer-level (RTL) model
Data path described structurally
Control section described behaviorally

15. multiplier multiplicand
shift_reg
control_ shift_
section adder
reg
product

16. • Testing a design by simulation
• Use a test bench model
– A model that uses your model
– Apply test sequences to your inputs
– Monitors values on output signals
• Either using simulator.
• Or with a process that verifies correct operation
• Or logic analyzer.

17.  Discrete event simulation
Time advances in discrete steps.
When signal values change—events occur.
 A processes is sensitive to events on input
signals
Specified in wait statements.
Resumes and schedules new values on output
signals.
○ Schedules transactions.
○ Event on a signal if value changes.

18. Initial Design Entry VHDL, Schematic, State Diagram
Optimize Boolean Expression
into a standard form
Logic Optimization - To optimize area or speed
Minimized Blocks
Technology Mapping - To minimize area
Where the logic block is placed ?
Placement - With optimum routing wire
Connection between cells
Routing - To minimize area.
Used to configure the final
Programming Unit circuit

21. • Implement the VHDL portion of coding for synthesis.
• Identify the differences between behavioral and
structural coding styles.
• Distinguish coding for synthesis versus coding for
simulation.
• Use scalar and composite data types to represent
information.
• Use concurrent and sequential control structure to
regulate information flow.
• Implement common VHDL constructs (Finite State
Machines [FSMs], RAM/ROM data structures).

22. • Executable specification.
• Functionality separated from implementation.
• Simulate early and fast (Manage complexity)
• Explore design alternatives.
• Get feedback (Produce better designs)
• Automatic synthesis and test generation (ATPG for
ASICs)
• Increase productivity (Shorten time-to-market)
• Technology and tool independence.
• Portable design data (Protect investment)

23. • Digital Signal Processing.
• IC Testing & Analysis.
• FPGA Design Verification.
• FPGA Development.
• Hardware Design.
• IC designing.
• ASIC Development.

24. • THANK YOU
E-Mail
Gaurav_rai@live.com
•