This document provides an overview of VLSI technology and Verilog coding through a presentation on VLSI technology. It begins with an introduction to VLSI and describes the different components involved in chip design. It then discusses hardware description languages and focuses on Verilog, explaining features like modules, data types, operators, and different coding styles like gate-level, dataflow, behavioral, and structural modeling. Finally, it provides an example of modeling a vending machine in Verilog as a finite state machine and shows how it would be simulated.
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A VLSI (Very Large Scale Integration) system integrates millions of “electronic components” in a small area (few mm2 few cm2).
design “efficient” VLSI systems that has:
Circuit Speed ( high )
Power consumption ( low )
Design Area ( low )
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
A VLSI (Very Large Scale Integration) system integrates millions of “electronic components” in a small area (few mm2 few cm2).
design “efficient” VLSI systems that has:
Circuit Speed ( high )
Power consumption ( low )
Design Area ( low )
Programmable logic controller performance enhancement by field programmable g...ISA Interchange
PLC, the core element of modern automation systems, due to serial execution, exhibits limitations like slow speed and poor scan time. Improved PLC design using FPGA has been proposed based on parallel execution mechanism for enhancement of performance and flexibility. Modelsim as simulation platform and VHDL used to translate, integrate and implement the logic circuit in FPGA. Xilinx’s Spartan kit for implementation-testing and VB has been used for GUI development. Salient merits of the design include cost-effectiveness, miniaturization, user-friendliness, simplicity, along with lower power consumption, smaller scan time and higher speed. Various functionalities and applications like typical PLC and industrial alarm annunciator have been developed and successfully tested. Results of simulation, design and implementation have been reported.
Fpga implementation of encryption and decryption algorithm based on aeseSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Visit https://www.vlsiuniverse.com/
https://www.vlsiuniverse.com/2020/05/complete-asic-design-flow.html
This is the standard VLSI design flow that every semiconductor company follows. The complete ASIC design flow is explained by considering each and every stage.
Programmable logic controller performance enhancement by field programmable g...ISA Interchange
PLC, the core element of modern automation systems, due to serial execution, exhibits limitations like slow speed and poor scan time. Improved PLC design using FPGA has been proposed based on parallel execution mechanism for enhancement of performance and flexibility. Modelsim as simulation platform and VHDL used to translate, integrate and implement the logic circuit in FPGA. Xilinx’s Spartan kit for implementation-testing and VB has been used for GUI development. Salient merits of the design include cost-effectiveness, miniaturization, user-friendliness, simplicity, along with lower power consumption, smaller scan time and higher speed. Various functionalities and applications like typical PLC and industrial alarm annunciator have been developed and successfully tested. Results of simulation, design and implementation have been reported.
Fpga implementation of encryption and decryption algorithm based on aeseSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Visit https://www.vlsiuniverse.com/
https://www.vlsiuniverse.com/2020/05/complete-asic-design-flow.html
This is the standard VLSI design flow that every semiconductor company follows. The complete ASIC design flow is explained by considering each and every stage.
verilog code and Test bench for
Basic Gate
half adder
full adder
half subtractor
full subtractor
mux
demux
encoder
decoder
BCD to E-3
E-3 to BCD
binary to BCD
BCD to binary
Ripple carry adder
This paper presents a design and implementation of FPGA based Bose, Chaudhuri and Hocquenghem (BCH) codes for wireless communication applications. The codes are written in VHDL (Very High Speed Hardware Description Language). Here BCH decoder (15, 5, and 3) is implemented and discussed. And decoder uses serial input and serial output architecture. BCH code forms a large class of powerful random error correcting cyclic codes. BCH operates over algebraic structure called finite fields and they are binary multiple error correcting codes. BCH decoder is implemented by syndrome calculation circuit, the BMA (Berlekamp-Massey algorithm) and Chien search circuit. The codecs are implemented over cyclone FPGA device.
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3. VLSI
VLSI is very large scale integration
technology.
It is related to the chip designing.
Chip designing is comprises of two areas:1. FRONT END
2. BACK END
VLSI uses CMOS technology
3
5. Hardware Description
Languages
Basic idea is a programming language to describe
hardware
Synthesis tools allow direct implementation from HDL
code.
Combined with modern Field Programmable Gate Array
chips large complex circuits (100000s of gates) can be
implemented.
There are many HDL’s as:1. ABEL
2. AHDL
3. VHDL
4. Verilog HDL
5. System Verilog
5
6. Verilog HDL
Launched
in 1984 by CADENCE.
Verilog
is Unlike VHDL is a case
sensitive language and uses
lower case.
It
is a CONCURRENT language.
COMPLEXITY
Only
of Verilog is low.
used for DIGITAL DESIGNS.
6
12. Gate level modelling
The gate level structure of digital design is required.
It requires the number of gates in the design.
It also requires the way the gates are connected.
The keywords defined for gates are as:AND
XOR
OR
XNOR
NOT
BUF
NAND
BUFIF1
NOR
BUFIF0
12
14. Dataflow modelling
The flow of data should be known from one point to
another.
It works on the Boolean expressions.
ASSIGN keyword is used to drive the values.
assign y=a&b;
Usually Boolean operators are used for dataflow
modelling and only the output equations are necessary
for designing.
14
15. Example:Dataflow modelling
4-bit Adder with instanciation
Step 1: build a 1-bit full adder as a module
S = (a) XOR (b) XOR (Cin ) ; ( S = a^b^Cin)
Cout = (a&b) |(Cin&(a+b))
module FA_1bit (S,Cout,a,b,Cin);
begin
input a,b,Cin;
Output S, Cout;
assign Sum = a^b^Cin;
assign Carry = (a&b) | (Cin&(a^b));
Module add_1bit
endmodule
15
16. 4-bit Adder
Step 2: initiate 4 instances of FA_1bit module
Cout
1-bit
Full
Adder
Cout2
1-bit
Full
Adder
S3
S2
module FA_4bits (S,Cout,A,B,Cin);
input [3:0] A, B;
input
Cin;
output [3:0]
S;
output
Cout
wire
Cout0, Cout1, Cout2
FA_1bit
FA1(S[0], Cout0,A[0],B[0],Cin);
FA_1bit
FA1(S[1], Cout1,A[1],B[1],Cout0);
FA_1bit
FA1(S[2], Cout2,A[2],B[2],Cout1);
FA_1bit
FA1(S[3], Cout,A[3],B[3],Cout2);
end
endmodule;
B0 A0
B1 A1
B2 A2
B3 A3
Cout1
1-bit
Full
Adder
S1
Cout0
1-bit
Full
Adder
Cin
S0
The inputs and the output
are 4-bits wide
we need wires to
propagate the carry from
one stage to the next
you may name the
instances with any name,
but you have to maintain
the order 16 the inputs and
of
outputs
17. Behavioral modelling
The behavior of the circuit should be known in the
terms of its inputs and outputs.
This modelling is semi-concurrent in nature.
It uses conditional statements just like in C as “if-else”
and “case” statements.
Begin….end statements are used as for sequential
execution.
17
19. D Flip-Flop with Asynchronous
Reset
always@(posedge clk or negedge rst)
begin
if (!rst) a<=0;
else a<=b;
end
19
20. Structural coding
It is basically not a coding style.
It
is used to connect behavioral designs
components to design more complex
circuits.
The
components of huge circuitry are
designed separately.
20
21. Vending machine
It is based on FSM.
FSM is the heart of any
digital design.
According to the input
state transition occurs.
The machine has four
states like
coke,mango,orange and
lime with an initial
state.
21
23. Standard Form for a
Verilog FSM
// state flip-flops
reg [2:0] state, nxt_st;
// state definitions
parameter
reset=0,S1=1,S2=2,S3=3,..
// NEXT STATE CALCULATIONS
always@(state or inputs or ...)
begin
…
next_state= ...
…
end
// REGISTER DEFINITION
always@(posedge clk)
begin
state<=next_state;
end
// OUTPUT CALCULATIONS
output= f(state, inputs)
23