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Digital Design with Verilog HDL, VHDL, and SystemVerilog: A Practical Approach for 6th Edition 18


Digital Design With an Introduction to the Verilog HDL VHDL and System Verilog 6th Edition 18




Digital design is a fascinating and rewarding field that combines logic, mathematics, computer science, and engineering. It is the art and science of designing digital systems that can perform various functions using binary signals. Digital design is essential for creating devices such as computers, smartphones, cameras, robots, games, etc.




DigitalDesignWithanIntroductiontotheVerilogHDLVHDLandSystemVerilog6thEdition18



If you are interested in learning digital design or improving your skills in this area, you might want to check out a classic textbook that has been updated with modern tools and techniques. The book is called Digital Design: With an Introduction to the Verilog HDL VHDL and SystemVerilog, written by M. Morris Mano and Michael D. Ciletti. It is a comprehensive and authoritative text that teaches the fundamental concepts of digital design in a clear, accessible manner. It also introduces three popular hardware description languages (HDLs) that are used to model, simulate, synthesize, and test digital systems: Verilog HDL, VHDL, and SystemVerilog.


In this article, we will give you an overview of what digital design is, what are Verilog HDL VHDL and SystemVerilog are , how this book teaches digital design with these languages , who this book is for ,and how you can get this book . We hope that this article will help you decide whether this book is suitable for your needs and interests.


What is digital design?




Digital design is a branch of engineering that deals with designing digital systems that can process information using binary digits (0s and 1s). Digital systems are composed of basic building blocks called logic gates , which perform simple operations such as AND , OR , NOT , etc. By combining logic gates in various ways , we can create more complex circuits that can perform functions such as arithmetic , memory , control , etc.


Digital design involves two main aspects : combinational logic and sequential logic. Combinational logic refers to circuits that produce outputs that depend only on the current inputs . Sequential logic refers to circuits that produce outputs that depend on both the current inputs and previous outputs . Sequential logic circuits use memory elements such as flip-flops , registers , counters , etc. to store information.


Digital design also involves two main methods : top-down design and bottom-up design. Top-down design refers to designing a system by starting from a high-level overview and then refining it into more detailed components. Bottom-up design refers to designing a system by starting from low-level components and then integrating them into higher-level components. Both methods have their advantages and disadvantages, and often a combination of both is used in practice.


What are Verilog HDL, VHDL, and SystemVerilog?




Verilog HDL, VHDL, and SystemVerilog are three widely used hardware description languages (HDLs) that are used to describe, model, simulate, synthesize, and test digital systems. HDLs are similar to programming languages, but they have some unique features and capabilities that make them suitable for digital design.


Verilog HDL stands for Verilog Hardware Description Language. It was developed in 1984 by Gateway Design Automation as a proprietary language for logic simulation. Later, it was standardized by IEEE in 1995 as IEEE 1364. Verilog HDL is based on the C programming language syntax and supports both behavioral and structural modeling of digital systems. Verilog HDL is widely used in the industry for designing ASICs (application-specific integrated circuits) and FPGAs (field-programmable gate arrays).


VHDL stands for VHSIC Hardware Description Language. VHSIC stands for Very High Speed Integrated Circuit. It was developed in 1983 by the U.S. Department of Defense as a standard language for describing military electronic systems. Later, it was standardized by IEEE in 1987 as IEEE 1076. VHDL is based on the Ada programming language syntax and supports both behavioral and structural modeling of digital systems. VHDL is widely used in the academia and the industry for designing ASICs and FPGAs.


SystemVerilog is an extension of Verilog HDL that was developed by Accellera Systems Initiative in 2002 as a unified language for design and verification of digital systems. Later, it was standardized by IEEE in 2005 as IEEE 1800. SystemVerilog incorporates many features from other languages such as C++, Java, VHDL, PSL (Property Specification Language), etc. SystemVerilog supports both behavioral and structural modeling of digital systems, as well as advanced verification techniques such as assertions, coverage, testbenches, etc. SystemVerilog is widely used in the industry for designing and verifying ASICs and FPGAs.


Verilog HDL




Verilog HDL is a hardware description language that can be used to describe digital systems at different levels of abstraction: behavioral, dataflow, gate-level, and switch-level. Verilog HDL has a simple and concise syntax that resembles the C programming language. Verilog HDL supports both procedural and concurrent statements that can be used to model the functionality and timing of digital systems.


A Verilog HDL program consists of one or more modules , which are the basic building blocks of a digital system. A module can have inputs , outputs , parameters , local variables , instances of other modules , etc. A module can also have one or more always blocks or initial blocks , which contain procedural statements that execute sequentially or concurrently depending on the sensitivity list . A module can also have one or more assign statements , which contain dataflow statements that assign values to outputs or variables based on expressions . A module can also have one or more primitive instances , which are predefined logic gates or switches that can be used to model structural logic.


Here is an example of a Verilog HDL module that implements a 4-bit full adder:



module full_adder_4bit( input [3:0] A, input [3:0] B, input Cin, output [3:0] S, output Cout ); // Declare local variables wire [3:0] C; // Instantiate four 1-bit full adders full_adder fa0(A[0], B[0], Cin, S[0], C[0]); full_adder fa1(A[1], B[1], C[0], S[1], C[1]); full_adder fa2(A[2], B[2], C[1], S[2], C[2]); full_adder fa3(A[3], B[3], C[2], S[3], Cout); endmodule


The above module takes two 4-bit inputs A and B , and a carry-in Cin , and produces a 4-bit output S , and a carry-out Cout . The module uses four instances of another module called full_adder , which implements a 1-bit full adder using dataflow statements:



module full_adder( input A, input B, input Cin, output S, output Cout ); // Use dataflow statements to implement logic assign S = A ^ B ^ Cin; // Sum = XOR of inputs assign Cout = (A & B) (A & Cin) (B & Cin); // Carry-out = OR of ANDs endmodule


VHDL




VHDL is a hardware description language that can be used to describe digital systems at different levels of abstraction: behavioral, dataflow, gate-level, register-transfer level (RTL), etc. VHDL has a rich and flexible syntax that resembles the Ada programming language. VHDL supports both sequential and concurrent statements that can be used to model the functionality and timing of digital systems.


A VHDL program consists of one or more entities , which are the basic building blocks of a digital system. An entity has an interface declaration , which specifies the inputs , outputs , generics , etc. An entity can also have an architecture declaration , which specifies the internal structure and behavior of the entity using concurrent statements . An entity can also have one or more configurations , which specify how different architectures are bound to different entities.


Here is an example of a VHDL entity that implements a 4-bit full adder:



entity full_adder_4bit is port ( A : in std_logic_vector(3 downto 0); B : in std_logic_vector(3 downto 0); Cin : in std_logic; S : out std_logic_vector(3 downto 0); Cout : out std_logic ); end entity; architecture rtl of full_adder_4bit is -- Declare local signals signal C : std_logic_vector(3 downto 0); begin -- Instantiate four 1-bit full adders fa0 : entity work.full_adder(rtl) port map ( A => A(0), B => B(0), Cin => Cin, S => S(0), Cout => C(0) ); fa1 : entity work.full_adder(rtl) port map ( A => A(1), B => B(1), Cin => C(0), S => S(1), Cout => C(1) ); fa2 : entity work.full_adder(rtl) port map ( A => A(2), B => B(2), Cin => C(1), S => S(2), Cout => C(2) ); fa3 : entity work.full_adder(rtl) port map ( A => A(3), B => B(3), Cin => C(2),