Xilinx training in mohali

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2. Introduction to VLSI
Stands for Very Large Scale Integration.
Process of creating integrated circuits by
combining thousands of transistor-based circuits
into a single chip.
Design/Manufacturing of extremely small,
complex circuit modified semiconductor material.
Language used for designing VLSI circuit
 VHDL
 Verilog

Basic difference between VHDL and Verilog
VHDL Verilog
1. Not Case Sensitive 1. Case sensitive
2. Difficult to learn 2. Easy to learn
3. Based on Pascal 3. Based on C

3. Software Used in VLSI Design
DSCH
 XILINX
ALTERA
MICROWIND

Use of DSCH
Three types of designs:
Gate Level Design
Chip Level Design
CMOS Level Design
3. Software Used in VLSI Design (Contd.)

USE OF XILINX AND ALTERA
Through VHDL and Verilog
 Data Flow
 Behavioural
 Structural

USE OF MICROWIND
Microwind Software is used for layout
design of various circuits.

4. VLSI Design Hierarchy
Flow diagram
Algorithm design
Design Entry
Fundamental
simulation
Specification
Specify what to design.
Design an Algorithm to
implement in software.
Enter the design in
computer system, so that it
can be compiled by the
design software.
After completion of entry
into computer, simulate to
see the result.

5. Basic VHDL Code
Library declaration
Entity
Architecture
Configuration

Library Declaration
For example-
Library ieee;
Use ieee.std_logic_1164.all;
Use ieee.std_logic_arith.all;
Use ieee.std_logic_unsigned.all;
Library Library_name;
Use library_name.package_name.package_parts;
5. Basic VHDL Code (Contd.)

Entity & Port Declaration
For example-
Entity and_gate is
Port ( a, b : in std_logic;
y : out std_logic);
End and_gate;
Entity<entity_ name> is
Port (port_name:<direction><data_type>;
port_name:<direction><data_type>);
End<entity_name>;

Architecture Declaration
Architecture< architecture_name> of <entity_name>
is
begin
.
.
.
.
.
.
.
.
end architecture_name

Types of VHDL Architecture
 Data flow
-It uses concurrent signal assignment statement.
- It describes the transfer of data from input to output
signals.
 Behavioral
- It is a high level description.
- It contains a set of assignment statement to represent behaviour.
 Structural
- Describe the circuit structure in terms of logic gates
- Interconnects wiring between logic gates to form a circuit net
list.

6.Verilog using Altera:
• Dataflow:
syntax
module<module name>(port name);
input<input names>;
output<output names>;
{
program part
}
end module

6.Verilog using Altera(contd.):
• Behavioral:
syntax:
module<module name>(port list);
input<input names>;
Reg <output name>;
always@<input name>;
begin
{
program part
}
end
end module

• Structural:
syntax:
input<input names>;
wire <port name>;
<component name><level>(port mapping)
end module

 Syntax for clock:
syntax:
input<input names>;
Reg <output name>;
always@(posedge clk)
begin
{
program part
}
end module

7.Design using Microwind
 Microwind is a windows tool for designing and
simulating microelectronic circuits at layout
level.
 Process: diffusion, poly-sillicon, pads, deep
submicron CMOS design and n-well process.

Microwind Window
7.Design using Microwind(contd.)

Microwind Design (For CMOS inverter)
7.Design using Microwind(contd.)

8.PROGRAMMABLE LOGIC DEVICE (PLD)
A PLD is used to build reconfiguration of
the digital circuits.
TYPES OF PLD
SIMPLE PROGRAMMABLE LOGIC DEVICE
(SPLD)
COMPLEX PROGRAMMABLE LOGIC DEVICE
(CPLD)
FIELD-PROGRAMMABLE GATE ARRAY (FPGA)

9.DOWNLOADING PROCESS ON PLD USING
XILINX
Write your program.
 Then check the property of PLD.
Browse on user constraints and double
click on assign package pins.
Then give pin numbers as input and
output.
Then save it.

DOWNLOADING PROCESS ON PLD USING
XILINX (Contd.)
Then browse on generate programming file.
Double click on configure device.
Finish and ok.
Then select file and then open and then ok.
Right click on your Xilinx and click on
program and then apply and then ok.

10.Conclusion
 Learned the various technology, application and scope of VLSI.
 Learned about the applications of VLSI design softwares and programming
languages .
 Downloading in PLD (Programmable Logic Device).
 Knew that there is tremendous scope and growth for those who choose VLSI
design as a career.

Xilinx training in mohali

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