The document discusses VHDL (VHSIC Hardware Description Language) and provides information on various topics related to VHDL such as the design flow, levels of abstraction, types of HDLs, comparing VHDL and Verilog, simulation vs. synthesis, logic simulation, motivation for mixed-signal microelectronics, viewing designs by chip technology, concepts of modules and chips, levels of abstraction, types of VHDL, comparing VHDL and Verilog, choosing an HDL, the IEEE standard 1164, entities, architectures, and data objects in VHDL like constants, signals, and variables.
This Presentation covers most of VHDL designing basic from scratch.
click the below link for contents
http://eutectics.blogspot.com/2014/01/how-to-design-programs-using-vhdl-all.html
Yaser Khalifa introduces you to VHDL (VHSIC Hardware Description Language), a hardware description language used in electronic design automation to describe digital and mixed-signal systems such as field-programmable gate arrays and integrated circuits.
VHDL (VHSIC Hardware Description Language) is becoming increasingly popular as a way to capture complex digital electronic circuits for both simulation and synthesis. Digital circuits captured using VHDL can be easily simulated, are more likely to be synthesizable into multiple target technologies, and can be archived for later modification and reuse.
Verilog HDL (Hardware Description Language) Training Course for self-taught instructional. User should be familiar with basic digital and logic design. Helpful to have a Verilog simulator while going through examples.
This Presentation covers most of VHDL designing basic from scratch.
click the below link for contents
http://eutectics.blogspot.com/2014/01/how-to-design-programs-using-vhdl-all.html
Yaser Khalifa introduces you to VHDL (VHSIC Hardware Description Language), a hardware description language used in electronic design automation to describe digital and mixed-signal systems such as field-programmable gate arrays and integrated circuits.
VHDL (VHSIC Hardware Description Language) is becoming increasingly popular as a way to capture complex digital electronic circuits for both simulation and synthesis. Digital circuits captured using VHDL can be easily simulated, are more likely to be synthesizable into multiple target technologies, and can be archived for later modification and reuse.
Verilog HDL (Hardware Description Language) Training Course for self-taught instructional. User should be familiar with basic digital and logic design. Helpful to have a Verilog simulator while going through examples.
hardware description language power point presentationdhananjeyanrece
A hardware description language enables a precise, formal description of an electronic circuit that allows for the automated analysis and simulation of an electronic circuit. It also allows for the synthesis of an HDL description into a netlist (a specification of physical electronic components and how they are connected together), which can then be placed and routed to produce the set of masks used to create an integrated circuit.
A hardware description language enables a precise, formal description of an electronic circuit that allows for the automated analysis and simulation of an electronic circuit. It also allows for the synthesis of an HDL description into a netlist (a specification of physical electronic components and how they are connected together), which can then be placed and routed to produce the set of masks used to create an integrated circuit.
Those slides describe digital design using Verilog HDL,
starting with Design methodologies for any digital circuit then difference between s/w (C/C++) and H/w (Verilog) and the most important constructs that let us start hardware design using Verilog HDL.
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4. Simulation Vs Synthesis
4
Front End Procedure Back end procedure
Correctness of program(code) Concentration on Chip Design
Functionality of Description
Apply I/P o/p
Ex. Full Adder (2HA+1OR )
Not check
Power,Delay,Performance,Size
Size,Power,Delay , performance
Tools: Modelsim, Questasim,
Front end Mentor graphics
Tools: Xilinx , cadence, Synopsis,
Backend Mentor graphics
Source : open source free internet
5. Logic Simulation
• A simulator interprets the HDL description and produces a
readable output, such as a timing diagram, that predicts
how the hardware will behave before its is actually
fabricated.
• Simulation allows the detection of functional errors in a
design without having to physically create the circuit.
5Source : open source free internet
6. Motivation
• The benefits of integrating analogue circuitry with digital
logic include:
• Higher performance
• Lower power consumption
• Less mass
• Reduced costs
• Improved reliability
• Greater levels of reusability
• Enhanced system testing and quality
• All of these benefits contribute to the spirit of “Faster,
Better, Cheaper”!
• All of these offer the potential to advance mixed-signal
microelectronics for space applications
6Source : open source free internet
7. View by Chip Technology
7
ARTIX7
KINTEX7
VIRTEX7
ZYNQ
SPARTAN-6
Source : open source free internet
11. Types of VHDL
• VHDL : VHSIC –HDL
VHSIC: Very High Speed Integrated Circuit- Hardware Description
Language.
It is a Hardware Description Language used in electronic design
automation to describe digital and mixed-signal systems.
VHDL is a description and simulation language like ada , panda, pascal
• Verilog HDL: Verilog Hardware Description Language.(like ‘C’
language)
HDL: Designed by IBM, Texas Instruments, and Intermetrics for
united states Air force .VHSIC program launched in 1980.
Standardized by the IEEE in 1987: IEEE 1076-1987
• TOOLS: Xilinx, Atmel, Altera, Mentor Graphics, Cadence
11Source : open source free internet
12. Compare VHDL and VERILOG
12
VHDL VERILOG
Entity, Multiple architecture
description
Only Module Declaration
Ada based constructs , not case
sensitive language
C language, case-sensitive
Harder to learn and use Easy to learn and use , Fast simulation
VHDL is strongly type language Verilog is weakly type language
User-defined, physical, enumeration
or pointer types is available and
required 9-valued logic
User-defined, physical, enumeration
or pointer types is not available and
required 4-valued logic
Very good FPGA library support. Better availability of ASIC library
support
Gate level , data flow and Behavioral
modeling
Gate level , data flow and Behavioral
modeling
Source : open source free internet
13. So Choose language (HDL) based on Trend and area of work
13Source : open source free internet
14. IEEE STANDARD 1164
To use standard logic data types place at top of source file
– LIBRARY ieee; -- library
– USE ieee.std_logic_1164.ALL; -- package
• Provides a standard data type
(std_logic) in VHDL - nine values
– U unitialized(Default value)
– ‘X’ strong drive , unknown logic
value
– ‘0’ strong drive, logic 0
– ‘1’ forcing, logic 1
– Z high impedance ( For tri-state
logic)
– ‘W’ weak unknown logic value
– ‘L’ weak drive, logic 0
– ‘H’ weak drive, logic 1
– ‘-’ don’t care
• Provides a standard data type
(std_logic) in Verilog - Four
values
– X forcing unknown
– 0 forcing logic 0
– 1 forcing logic 1
– Z high impedance
14Source : open source free internet
15. Entity
• The entity defines the external view of the component. It provides
system’s interface specification as seen from the outside.
• PORTS are the communication links between entities or connections to
the device pins
Syntax For Entity
entity EntityName is
port (port list Input and output);
end EntityName;
Note the use of libraries before entity description
Libray ieee;
USE ieee.std_logic_1164.all;
ENTITY andgate IS
PORT (a, b : IN std_logic;
y : OUT std_logic);
END andgate;
15Source : open source free internet
16. Architecture
• The Architecture defines the function or behavior or structure of
the ENTITY
• Consists of
– concurrent statements
– Sequential statements
• An entity may have several architectures Multiple Architecture
Syntax For Architecture
Architecture ArchitectureName of EntityName is
begin
-- signal declarations
-- concurrent statements
end ArchitectureName;
16
Entity
A B C
Architecture behavior OF andgate is
Begin
y <= a and b;
END behavior;
Source : open source free internet
17. Complete VHDL Code for AND Gate
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
Entity andgate is
Port (a, b : IN std_logic;
y : OUT std_logic);
End andgate;
Architecture behavior OF andgate is
Begin
Y<= a and b;
End behaviour;
• Architecture behavior END behavior;
17Source : open source free internet
20. CLASS: Each object belong to one of following class:
Constant: Hold values that cannot be changed within a
design.
Syntax: Constant constant name: Data Type := Value;
Example: 1] constant width: integer :=8;
2] constant Clk_Period: Time := 15 ns;
Continue 20
• Constant
• Signals
• Variables
Source : open source free internet
21. CLASS
• Variable: A variable is an object with single value.
• Values can be change during simulation through the variable
assignment statements.
• A variable declaration include one or more identifiers.
• Variable used in Process not in architecture.
• Internal representation used by programmers; do not exist
physically.
• Syntax: variable identifier_list: type [range_expr] [:=expression];
Example: 1] variable A,B: Std_logic;
2] Variable sum : std_logic-vector( 0 to 7);
21
Variable name
Source : open source free internet
22. CLASS
Signal: To represent wire connections within circuit.
Signal is an object within past history of values.
Signal have multiple drivers each with a current value and
projected future value. Signal Describing H/W sytsem.
Syntax: Signal identifier_list: type [range_expr] [:=expression];
Example: 1] signal count: STD_LOGIC_VECTOR (3 downto 0);
2] signal Gate-Delay: Time:=10ns;
-- count means 4 wires; they are count(3),count(2), count(1), count(0).
22Source : open source free internet