1. Bapuji Educational Association ®
BAPUJI INSTITUTE OF ENGINEERING AND TECHNOLOGY DAVANGERE, KARNATAKA-577004
DEPARTMENT OF
ELECTRONICS & COMMUNICATION ENGINEERING
Internship Progreess Presentation
On
“VLSI Design and Verification”
Presented by,
ABHISHEK S SHINGADI
(4BD22EC400)
Dr.G SUNITHA
M.Tech. (DEAC), Ph.D., MISTE, FIETE., FIE
Program Coordinator
Dr. KIRAN KUMAR G H
M.Tech. Ph.D.
Internship Guide 1
2. BAPUJI INSTITUTE OF ENGINEERING AND TECHNOLOGY,
DAVANGERE-577004
Vision
To be a centre of excellence recognized nationally and internationally, in distinctive areas of engineering education and research,
based on a culture of innovation and invention.
Mission
BIET contributes to the growth and development of its students by imparting a broad based engineering education and
empowering them to be successful in their chosen field by inculcating in them positive approach, leadership qualities and
ethical values.
2
3. To be in the forefront in providing quality technical education and research in
Electronics & Communication Engineering to produce skilled professionals to cater to
the challenges of the society.
Mission of theDepartment
M1: To facilitate the students with profound technical knowledge through
effective teaching learning process for a successful career.
M2: To impart quality education to strengthen students to meet the industry
standards and face confidently the challenges in the programme.
M3: To develop the essence of innovation and research among students and
faculty by providing infrastructure and a conducive environment.
M4: To inculcate the student community with ethical values, communication
skills, leadership qualities, entrepreneurial skills and lifelong learning to meet the
societal needs.
Vision of the Department
4. COURSE LEARNING OBJECTIVES
This course will enable us to:
1. Experience a real-life engineering workplace and understand how their engineering
knowledge and skills can be utilized in Industry.
2. Expose to the current Technological trends relevant to the field of training.
3. To enhance communication skills, teamwork capabilities and develop professional
behaviour.
4. Use Internship experience to develop their engineering skills and practices that boost
their employability.
5. Gain experience in writing technical/projects reports and expose students to the
engineer’s responsibilities and ethics.
5. Contents
1. Introduction
2. WORK CARRIED OUT IN FIRST WEEK
3. WORK CARRIED OUT IN SECOND WEEK
4. WORK CARRIED OUT IN THIRD WEEK
5. WORK CARRIED OUT IN FIRST WEEK
6. Introduction
BASIC INFORMATION OF VERILOG
● Verilog is a hardware description language used for developing code that
describes digital systems and circuits.
● For the design and verification of digital and mixed-signal systems, Verilog is
frequently utilized including both application-specific integrated circuits (ASICs)
and field-programmable gate arrays (FPGAs).
● Developed by Gateway Design Automation and later acquired by Cadence Design
Systems
7. Hardware Modeling
There are two fundamental aspects of any piece of hardware:
Behavioral
The behavioral aspects tells us about the behavior of hardware. What is its functionality
and speed (without bothering about the constructional and operational details).
Structural
The structural aspect tells us about the hardware construction. The design is comprised of
which parts and how the design is constructed from these parts i.e. how they have been
interconnected.
9. Modeling Styles
Verilog is both, behavioral and structural language. Designs in Verilog can be described
at all the four levels of abstraction depending on needs of design.
Behavioral Level: - Used to model behavior of design without concern for the
hardware implementation details. Designing at this level is very similar to C
programming.
Dataflow Level [RTL]: - Module is specified by specifying the data flow. The
designer is aware of how the data flows between registers.
Gate Level: - Module is implemented in terms of logic gates & interconnections
between them. Design at this level is similar to describing design in terms of gate level
logical diagram.
Switch Level: - lowest level of abstraction provided by Verilog. Module can be
implemented in terms of switches, storage nodes & interconnection between them.
12. Gate Level Half Adder
Gate Level Half Adder Dataflow Level Half Adder Behavioral Level Half Adder
/ Adder Module
module
half_adder(sum,carry,A,B);
output sum;
output carry;
input A, B;
xor my_xor(sum,A,B);
and my_and(carry,A,B);
endmodule
// Adder Module
module
half_adder(sum,carry,A,B);
output sum;
output carry;
input A, B;
assign sum = (~A&B) +
(A&~B);
assign carry = A&B;
endmodule
/ Adder Module
module
half_adder(sum,carry,A,B);
output sum; reg sum;
output carry; reg carry;
input A, B;
always @(A or B)
begin
{carry, sum} = A + B;
end
endmodule
13. Case Sensitivity in Variable Names
module case_sensitivity_example;
reg data; // Lowercase variable
reg Data; // CamelCase variable (distinct from 'data')
reg DATA; // All uppercase variable (distinct from 'data' and 'Data')
initial begin
data = 1'b0; // Assign to 'data'
Data = 1'b1; // Assign to 'Data'
DATA = 1'b0; // Assign to 'DATA'
end
endmodule
Case Sensitivity in Keywords
All keywords must be in LOWER case i.e., the language is case sensitive
Module top; // Incorrect: 'Module' should be in lowercase 'module’
Endmodule // Incorrect: ‘Endmodule' should be in lowercase 'module’
Syntax & Semantics
14. VLSI Data Types
1.Physical Data Types
2.Abstract (Register) Data Types
3.Constants
1.Physical Data Types
▪ “wor” performs “or” operation on multiple driver logic. E.g. ECL circuit
▪ “wand” performs “and” operation on multiple driver logic. E.g. Open collector
output
▪ “trior” and “triand” perform the same function as “wor” and “wand”, but model
outputs with
resistive loads.
15. 2.Abstract (Register) Data Types
Vector:- A vector in Verilog is a collection of bits, and it can represent multi-bit signals such
as buses or registers..
reg: {size = 1-bit, default value = 1’bx, type = unsigned}
String:- there isn't a dedicated string data type for storing strings directly. However, you can
use character arrays (or reg arrays) to store sequences of characters,
which can be treated as strings. Each character can be stored as a single bit or a multi-bit
representation, typically using 8 bits for ASCII characters
Integer:- The integer data type in Verilog is used to represent signed integer values. It is a
built-in data type that provides a way to store
whole numbers, which can be both positive and negative.
real:- The real data type is used to represent floating-point numbers, which can hold decimal
values.
16. 3.Constants
▪ Constants can be defined in a module by the keyword parameter.
▪ Thus, can not be used as variables.
▪ Improves code readability
Parameter:- in Verilog. Parameters allow you to define constants that can be used throughout your
module, making your code more flexible and easier to maintain.
defparam:- The defparam statement in Verilog is used to override parameter values defined in a
module instantiation. It allows you
to specify different values for parameters at the time of module instantiation without modifying the
original module.
17. Gate level modelling and Concept Wire
• Verilog language provides basic gates
as built-in Primitives as shown.
• Since they are predefined, they do
not need module definition.
• Primitives available in Verilog.
i. Multiple input gates: and,
nand, or, nor, xor, xnor
ii. Multiple output gates: not,buf
18. Continues Assignments and Data Operators
Syntax of assign statement:
Assign < drive_strength > < delay > < list_of_assignment >
input A, B, C;
output Y;
Assign Y = A & B
Continuous assignment characteristics:
• Left-Hand Side (LHS): Must be a net (like wire) or a combination of nets. Cannot be a register (like reg).
• Right-Hand Side (RHS): Can be nets, registers, or function calls. Can be single bits (scalar) or multiple bits
(vector).
• Evaluation: The RHS expression is evaluated whenever any of its inputs change. The result is immediately
assigned to the LHS.
• Delays: You can add delays to control when the LHS gets the updated value.
19. Verilog Data Operators: -
▪ Arithmetic
▪ Bitwise
▪ Logical
▪ Reduction
▪ Shift
▪ Relational
▪ Equality
▪ Concatenation
▪ Replication
▪ Conditional
Arithmetic Operators
▪ If any operand contains z or x the result is unknown
▪ If result and operand are of same size, then carry is lost
▪ Treats vectors as a whole value
Verilog Operators
20. Bitwise Operators
▪ Operates on each bit of operand
▪ Result is in the size of the largest operand
Logical Operators
▪ Can evaluate to 1, 0, x values
▪ The results is either true (1) or false (0)
Shift Operators
▪ Shifts the bit of a vector left or right
▪ Shifted bits are lost
▪ Arithmetic shift right fills the shifted bits
with sign bit
▪ All others fill the shifted bits by zero
Operators Operations
21. Relational Operators
▪ Evaluates to 1, 0, x
▪ Result in x if any operand bit is z or x
Equality Operators
▪ assign Write Me = (wr == 1) &&
((a >= 16’h7000) && (a < 16’h8000));
22. Procedural Blocks and Assignments in Verilog
Always Block: Initial block is used in behavioral modeling to describe a block of code that runs only once at the
beginning of the simulation. It’s often used to initialize values, generate stimulus, or set up certain conditions before the
simulation runs.
Initial Block: An always block in Verilog is used in behavioral modeling to describe behavior that should happen
repeatedly, either based on a sensitivity list or at specified time intervals. It is typically used for modeling sequential
logic, combinational logic, or clock-driven circuits.
Procedural assignments: Procedural assignments are used within initial or always blocks to assign values to reg
types. They allow you to model how the values of signals change over time, simulating the behavior of digital
circuits.
Non- blocking assignments: Non-blocking procedural assignments (<=) are commonly used in Verilog to model
sequential logic, particularly when you want
to simulate behavior similar to flip-flops or registers that store values on clock edges. Non-blocking assignments are
designed to allow multiple assignments to be scheduled at the same time step without affecting the order of
execution.
Sequential Blocks: Statements are enclosed within the keywords begin & end. Statements are processed in order
they are specified. Delays specified are additive
Parallel Blocks:Statements are enclosed within the keywords fork & join. Statements in a parallel block are
executed concurrently. Ordering of statements is
controlled by the delay or event control assigned to each statement.
23. ▪ Timing Controls
1. Delay Based Timing Controls
2.Event Based Timing Controls
3. Level Sensitive Control
4.Conditional Statements -if...else/case
24. 1. Delay Based Timing Controls
Delay timing control types Declaration
▪ Regular delay control = The non-zero delay is specified at the LHS of the
procedural statement.
▪ Intra-assignment delay control = Delay is specified between the assignment operator and the
RHS operand.
▪ Zero delay control = The zero delay is specified at LHS of procedural statement
2.Event Based Timing Controls
Event timing control types Declaration
▪ Regular event control = An event control is specified using @ symbol
▪ Event OR control = Multiple events are declared using the ‘or’ keyword or comma ‘,’
symbol.
▪ Named event control = The event declared using -> symbol as event triggering @
symbol as waiting for event trigger.
▪ Level sensitive timing control =The ‘wait’ keyword is used in the declaration
25. 3. Level Sensitive Control
Along with the edge-sensitive construct (while waiting for an event trigger), Verilog
adds up the ‘wait’ level-sensitive construct to wait for a specified condition to be true,
and then only one or more statements will be executed. Thus, a set of statements will be
blocked until the ‘wait’ condition is evaluated to be true.
Syntax:
wait(<expression or variable>)
4.Conditional Statements -if...else/case
Verilog supports ‘if’, ‘else if’, ‘else’ same as other programming languages. The
‘If’ statement is a conditional statement based on which decision is made whether
to execute lines inside if block or not. The begin and end are required in case of
multiple lines present in ‘if’ block. For single-line inside if statement may not
require ‘begin..end’ The ‘if’ statement returns true if the expression calculates its
value as 1 otherwise, for 0, x, z values ‘if’ block will not be executed
26. Looping Constraints
There are four types of looping statements in Verilog:-
▪ While
▪ For
▪ Repeat
▪ Forever
Loop Statements - while
27. Loop Statements - for
Syntax:
for (initial assignment; expression; step assignment)
begin
procedural assignment
end
28. Loop Statements - repeat
▪ Keyword repeat is used for this loop.
▪ Executes the loop for fixed number of times.
Loop Statements - forever
Looping statements appear inside procedural
blocks only.
The forever loop executes continuously
i.e. the loop never ends
30. What is SystemVerilog?
SystemVerilog is a hardware description and verification language (HDVL) that
extends Verilog to support advanced modeling and verification of digital systems. It
is widely used in designing and verifying Application-Specific Integrated Circuits
(ASICs) and Field-Programmable Gate Arrays (FPGAs)
Applications of SystemVerilog
•Designing RTL (Register Transfer Level) Logic
•Verification using Testbenches
•Formal Property Checking and Coverage Analysis
•Designing and Testing Complex Digital Systems (like
CPUs, GPUs, and SoCs)
SystemVerilog is standardized as IEEE 1800 and is widely
supported by industry tool
![Modeling Styles
Verilog is both, behavioral and structural language. Designs in Verilog can be described
at all the four levels of abstraction depending on needs of design.
Behavioral Level: - Used to model behavior of design without concern for the
hardware implementation details. Designing at this level is very similar to C
programming.
Dataflow Level [RTL]: - Module is specified by specifying the data flow. The
designer is aware of how the data flows between registers.
Gate Level: - Module is implemented in terms of logic gates & interconnections
between them. Design at this level is similar to describing design in terms of gate level
logical diagram.
Switch Level: - lowest level of abstraction provided by Verilog. Module can be
implemented in terms of switches, storage nodes & interconnection between them.](https://image.slidesharecdn.com/internvlsi1-250304054102-ef846a16/85/INTERN-VLSI-1-pptx-INTERN-VLSI-1-pptx-ppt-9-320.jpg)
