Chapter 4 :: Hardware Description Languages Digital Design and
Hardware description language (HDL): allows designer to specify logic function only. Then a computer-aided design (CAD) tool produces or synthesizes the
Hardware Description Languages
This appendix gives a quick introduction to the SystemVerilog and VHDL Hardware. Description Languages (HDLs). Many books treat HDLs as programming
The Verilog hardware description language
1800-2012 “System Verilog” – Unified hardware design spec
IEEE Standard for Verilog Hardware Description Language
The Verilog hardware description language (HDL) became an IEEE standard in 1995 as IEEE Std 1364-. 1995. It was designed to be simple intuitive
Hardware description language (HDL) A hardware description
A hardware description language (HDL) is a computer-based language that describes the hardware of digital systems in a textual form.
Caisson: A Hardware Description Language for Secure Information
specific abstractions for hardware design (specifically finite state machines) to create a new Hardware Description Language (HDL) named Caisson. Our goal
IEEE Standard for Verilog Hardware Description Language
Apr 7 2006 The Verilog hardware description language (HDL) became an IEEE standard in 1995 as IEEE Std 1364-. 1995. It was designed to be simple
Lecture 20: Hardware Description Languages & Logic Simulation
What is Logic Synthesis? ▫ Design described in a Hardware Description Language (HDL) • hardware description language - Verilog VHDL. • general-purpose ...
IEEE standard Verilog hardware description language - IEEE Std
Sep 28 2001 ... PDF: ISBN 0-7381-2827-9 SS94921. No part of this publication may be ... language interface
Hardware Description Language
RTL Hardware Design by P. Chu. Chapter 2. 2. Outline. 1. Overview on hardware description language. 2. Basic VHDL Concept via an example.
Chapter 4 :: Hardware Description Languages Digital Design and
Hardware description language (HDL): allows designer to specify logic function only. Then a computer-aided design (CAD) tool produces or.
IEEE Standard for Verilog Hardware Description Language
7 kwi 2006 PDF: ISBN 0-7381-4851-2 SS95395 ... The Verilog hardware description language (HDL) became an IEEE standard in 1995 as IEEE Std 1364-.
Hardware Description Languages
This appendix gives a quick introduction to the SystemVerilog and VHDL Hardware. Description Languages (HDLs). Many books treat HDLs as programming
IEEE Standard for Verilog Hardware Description Language
PDF: ISBN 0-7381-4851-2 SS95395. No part of this publication may be The Verilog hardware description language (HDL) became an IEEE standard in 1995 as ...
Caisson: A Hardware Description Language for Secure Information
programming languages to provide a new perspective on design- ing secure hardware. We describe a new hardware description lan- guage Caisson
Hardware Description Language Modelling and Synthesis of
quantum (SFQ) based circuit using hardware description languages (HDL) are implemented and thereafter a synthesis method for Rapid SFQ circuits is carried
IEEE standard Verilog hardware description language - IEEE Std
28 wrz 2001 PDF: ISBN 0-7381-2827-9 SS94921 ... Hardware Description Language (Verilog HDL) became an IEEE standard in 1995 as IEEE. Std 1364-1995.
LLHD: A Multi-level Intermediate Representation for Hardware
7 kwi 2020 Modern Hardware Description Languages (HDLs) such as. SystemVerilog or VHDL are due to their sheer complexity
3. VERILOG HARDWARE DESCRIPTION LANGUAGE
To automate hardware design requires a Hardware Description Language (HDL) a different nota- tion than what we used in chapter 2 which is suitable for
[PDF] The Verilog Hardware Description Language (Thomas Moorby)pdf
%2520Moorby).pdf
[PDF] Hardware Description Languages
A 1 Introduction This appendix gives a quick introduction to the SystemVerilog and VHDL Hardware Description Languages (HDLs)
[PDF] Chapter 4 :: Hardware Description Languages Digital Design and
Hardware description language (HDL): allows designer to specify logic function only Then a computer-aided design (CAD) tool produces or
[PDF] Hardware Description Languages - Basic Concepts - IIT Bombay
May 2006 Dinesh Sharma May 2006 Hardware Description Languages Page 2 The Design Process Basic HDL concepts Concurrent and sequential Descriptions
[PDF] Hardware Description Languages - Cartagena99
The specifications are generally given in a hardware description language (HDL) The two leading hardware description lan- guages are Verilog and VHDL
[PDF] The Verilog hardware description language
Based on the C language VHDL = VHSIC Hardware Description Language 2001: Can include port direction and data type in the port list (ANSI C format)
[PDF] IEEE Standard for Verilog Hardware Description Language
PDF: ISBN 0-7381-4851-2 SS95395 No part of this publication may be Abstract: The Verilog hardware description language (HDL) is defined in this
(PDF) Hardware Description Language Demystified - ResearchGate
28 août 2020 · PDF This book is focusing on learning Verilog HDL concepts in an easy manner and at the same time creating digital system design
verilog/Donald E Thomas Philip R Moorby The Verilog® Hardware
Thomas Philip R Moorby The Verilog® Hardware Description Language 2002 pdf
[PDF] The Verilog Hardware Description Language - GitHub Pages
These are later connected to individual input wires in module design Alternate: module testgen (i); reg [3:0] i; output i; always for
[PDF] The Verilog Hardware Description Language (Thomas Moorby)pdf
%2520Moorby).pdf
[PDF] Hardware Description Languages
A 1 Introduction This appendix gives a quick introduction to the SystemVerilog and VHDL Hardware Description Languages (HDLs)
[PDF] Chapter 4 :: Hardware Description Languages Digital Design and
Hardware description language (HDL): allows designer to specify logic function only Then a computer-aided design (CAD) tool produces or
[PDF] Hardware Description Languages - Basic Concepts - IIT Bombay
May 2006 Dinesh Sharma May 2006 Hardware Description Languages Page 2 The Design Process Basic HDL concepts Concurrent and sequential Descriptions
[PDF] Hardware Description Languages - Cartagena99
The specifications are generally given in a hardware description language (HDL) The two leading hardware description lan- guages are Verilog and VHDL
[PDF] The Verilog hardware description language
Hardware Description Languages • Verilog – created in 1984 by Philip Moorby of Gateway Design Automation (merged with Cadence)
[PDF] IEEE Standard for Verilog Hardware Description Language
The Verilog hardware description language (HDL) became an IEEE standard in 1995 as IEEE Std 1364- 1995 It was designed to be simple intuitive
verilog/Donald E Thomas Philip R Moorby The Verilog® Hardware
Thomas Philip R Moorby The Verilog® Hardware Description Language 2002 pdf
[PDF] The Verilog Hardware Description Language - GitHub Pages
Don Thomas 1998 1 The Verilog Hardware Description Language They describe the circuit using logic gates — much as you would see in an implementation
[PDF] Hardware Description Language Modelling and Synthesis - CORE
In this study methods to model single flux quantum (SFQ) based circuit using hardware description languages (HDL) are implemented
What language is hardware description?
A hardware description language (HDL) is a programming language used to describe the behavior or structure of digital circuits (ICs). HDLs are also used to stimulate the circuit and check its response. Many HDLs are available, but VHDL and Verilog are by far the most popular.Is VHDL a hardware description language?
What Is VHDL? Very High-Speed Integrated Circuit Hardware Description Language (VHDL) is a description language used to describe hardware. It is utilized in electronic design automation to express mixed-signal and digital systems, such as ICs (integrated circuits) and FPGA (field-programmable gate arrays).What is Verilog hardware description language?
Verilog Hardware Description Language. Verilog is a description language that describes the behavior of a logic circuit at gate level. It can also be used for simulation of a logic designs. It does not just simulate the function of the circuit but also the delays for switching each gate.- Verilog is a HARDWARE DESCRIPTION LANGUAGE (HDL). It is a language used for describing a digital system like a network switch or a microprocessor or a memory or a flip?flop. It means, by using a HDL we can describe any digital hardware at any level.
The Design ProcessBasic HDL concepts
Concurrent and sequential Descriptions
Hardware Description Languages
Basic Concepts
Dinesh Sharma
Microelectronics Group, EE Department
IIT Bombay, Mumbai
May 2006
Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
The Design Process
We ask our selves the question:What is Electronic Design? Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
The Design Process
We ask our selves the question:What is Electronic Design? Given specifications, we want to develop a circuit by connecting knownelectronic devices, such that the circuit meets given specifications. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
The Design Process
We ask our selves the question:What is Electronic Design? Given specifications, we want to develop a circuit by connecting knownelectronic devices, such that the circuit meets given specifications. "Specifications" refer to the description of the desired behaviour of the circuit. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
The Design Process
We ask our selves the question:What is Electronic Design? Given specifications, we want to develop a circuit by connecting knownelectronic devices, such that the circuit meets given specifications. "Specifications" refer to the description of the desired behaviour of the circuit. "Known" devices are those whose behaviour can be modeled by known equations or algorithms, with known values of parameters. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
Electronic Design
Electronic Design is the process of converting
a behavioural description (What happens when ..) to a structural description (What is connected to what and how ..) After conversion to a structural description, we may need todo "Physical Design" which involves choosing device sizes, placement of blocks, routing of interconnect lines etc. This part is already done for us in FPGA based design. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
Conquest over Complexity
The main challange for modern electronic design is that the circuits being designed these days are extremely complex.While IC technology has moved at a rapid pace,
capabilities of human brain have remained the same :-( The human mind cannot handle too many objects at the same time. So a complex design has to be broken down into a small number of `manageable' objects. If each object is still too complex to handle, the above process has to be repeated recursively. This leads to hierarchical design. Systematic procedures have to be developed to handle complexity. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
A page out of the software designer's book
We must learn from the experience of software designers for handling complexity.We must adopt:
Hierarchical Design.
Modular architecture.
Text based, rather than pictorial descriptions.
Re-use of existing resources
Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
Abstraction Levels
Structural
Functional
Y chart
Gajski and KahnTypes and levels of modeling
LowHighAbstraction
Levels ofGeometric
Abstraction levels refer to
functional, structural or geometricviewsof the design.Top down design begins with
higher levels of abstraction.As we go to lower levels of
abstraction, the level of detail goes up.It is advantageous to do as
much work as possible at higher levels of abstraction, when thw detail is low. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
Abstraction Levels: Geometric
Y chartGajski and KahnTypes and levels of modelingStick Diagrams
Unit CellsFloor Plan
PolygonsGeometric
At high levels of geometric
abstraction, we view the layout as a floor plan with blocks.At lower levels, we look at
basic cells.At lower levels still, we view
transistors as stick diagrams.At the lowest level, we have to
worry about all rectangles and polygons making up the layout. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
Abstraction Levels: Structural
Structural
Y chart
Gajski and KahnTypes and levels of modeling
Transistors
Registers
Blocks
Functional
GatesAt high levels of abstraction,
we view the structure in terms of functional blocks or IP cores.At lower levels, we see it in
terms of registers, simple blocksAt still lower levels, we view it
in terms of logic gates etc.At the lowest level, we have to
see full details at transistor level. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
Abstraction Levels: Functional
FunctionalY chart
Gajski and KahnTypes and levels of modeling
SpecificationsControl Flow
AlgorithmsData and
Equations
At the top level, we have the
functional specifications.At lower levels, we view the
design in terms of protocols and algorithms.At Still lower levels, we view it
in terms of data and control flow etc.At the highest level of detail,
we have to worry about all the governing equations at all nodes. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
Design Flow: System and logic level
System Partitioning
Block specification
Block Level Simulation
Logic Design
Logic SimulationOK?
OK? Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
Design Flow: Physical level
OK?Physical Design
Layout, Back extraction
Resimulation, Timing
Fabrication
Mask Making
TestOK?Debug
Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
Hierarchical Design
The design process has to be hierarchical.
A complex circuit is converted to a structural description of blocks which have not yet been designed - but whose behaviour can be described. Each of these blocks is then designed as if it was an independent design problem of lower complexity. This process is continued till all blocks are broken down into "known" devices. It is essential that any departure from proper operation is detected early - at a low complexity level. A hardware description language must be able to simulate a system whose components have been designed to different levels of detail. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
But Hardware is different!
Hardware components are concurrent
(all parts work at the same time).Whereas (traditional) software is sequential -
(executes an instruction at a time). Description of hardware behaviour has timing as an integral part.Traditional software is not real time sensitive.
Therefore, design of complex hardware involves many more basic concepts beyond those of programming languages. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential DescriptionsDesign Flow
Hardware Description Languages
Hardware description languages need the ability toDescribe
Simulate at
Behavioural
Structural
and mixed level. and to synthesize (structure from behaviour). Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential Descriptions
Timing and Delays
concurrencySimulation of hardware
Basic HDL concepts
Timing
Concurrency
Hardware Simulation process which involves:
Analysis
Elaboration
and SimulationSimulation proceeds in two distinct phases
Signal update
Selective re-simulation
Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential Descriptions
Timing and Delays
concurrencySimulation of hardware
HDL Uses
Hardware Description Languages are used for:
Description of
Interfaces
Behaviour
Structure
Test Benches
Synthesis
Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential Descriptions
Timing and Delays
concurrencySimulation of hardware
Delays
How do we describe delays?
Delay = 30uSOutInOut<=In AFTER 30 uS;
Is this description unambiguous?
Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential Descriptions
Timing and Delays
concurrencySimulation of hardware
Delay: Inertial
InOutx
In x out 30uSDinesh Sharma, May 2006Hardware Description Languages
The Design Process
Basic HDL concepts
Concurrent and sequential Descriptions
Timing and Delays
concurrencySimulation of hardware
Delay: Transport
Optical Fibre
Delay=30uSIn
Out In Out Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential Descriptions
Timing and Delays
concurrencySimulation of hardware
Modeling Delay
So thesameamount of delay (30μS in our example), can result inqualitativelydifferent phenomena!We have to define two differentkindsof delay
Inertial Delayis the RC kind of delay, which swallows pulses much narrower than the delay amount. Transport Delayis the optical fibre kind of delay, which lets all pulses pass through irrespective of their width. In most hardware description languages, Delays are inertial by default. The delay amount is taken to bezeroif not specified. Dinesh Sharma, May 2006Hardware Description LanguagesThe Design Process
Basic HDL concepts
Concurrent and sequential Descriptions
Timing and Delays
concurrencySimulation of hardware
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