Otis Singleton
The language built into the electrical circuitry of a computer is known as a hardware description language (HDL). HDLs are used to describe the functionality of digital circuits and can be thought of as a way of programming the electrical circuitry of a computer. HDLs are integral to electronic design automation (EDA) systems, especially for complex circuits, such as microprocessors and programmable logic devices. HDLs enable precise descriptions of electronic circuits, allowing for automated analysis, simulation, and synthesis of circuit designs. They also facilitate faster communication and programming, ensuring compatibility with other computers using the same language. Common HDLs include Verilog and VHDL, which are chosen based on software tool availability and designer experience. HDLs have become essential in managing the increasing complexity of digital electronic circuits, providing a high-level description of circuit behaviour and data flow.
| Characteristics | Values |
|---|---|
| Purpose | Allows for faster communication between the computer and its operator |
| Makes it easier to program the computer | |
| Ensures the computer will be compatible with other computers that use the same language | |
| Disadvantages | Can make the computer more difficult to operate if you are unfamiliar with the language |
| If the language is not well-designed, it can make the computer harder to program | |
| If changes are made to the language, they may not be compatible with other computers that use the same vocabulary | |
| HDLs Used To Describe Functionality | Verilog |
| VHDL | |
| HDLs Used To Describe Structure | Dataflow |
| Behavioral | |
| Structural | |
| Programming Languages Used To Interact With Electronics | C |
| C++ | |
| Assembly Language | |
| Java | |
| Python |
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What You'll Learn
Hardware description languages (HDLs)
In computer engineering, a hardware description language (HDL) is a specialized computer language used to describe the structure and behaviour of electronic circuits, usually to design application-specific integrated circuits (ASICs) and to program field-programmable gate arrays (FPGAs). HDLs are standard text-based expressions of the structure of electronic systems and their behaviour over time. HDLs are used for designing processors, motherboards, CPUs, and various other digital circuits.
The concept of HDLs as a medium for design capture was first introduced in the 1950s, but they did not gain wide adoption until after 1985. The first HDL was called "Description Language for Hardware" (DLH) and was developed by IBM in the late 1960s. However, it was not widely used due to its complexity. Other HDLs such as ABEL and PALASM gained popularity in the 1980s, and in the mid-1980s, VHDL was introduced by the US Department of Defense. Today, the most popular HDLs are Verilog and VHDL.
HDLs enable a precise, formal description of an electronic circuit, allowing for automated analysis and simulation. They also allow for the synthesis of an HDL description into a netlist, which is a specification of physical electronic components and their connections. This netlist can then be used to produce the set of masks needed to create an integrated circuit. HDLs are an integral part of electronic design automation (EDA) systems, especially for complex circuits such as microprocessors and programmable logic devices.
HDLs have been compared to assembly languages in terms of their level of abstraction. HDLs resemble traditional programming languages like C or Python but are not identical. HDLs are specifically designed to describe hardware, and unlike programming languages that represent sequential operations, HDLs represent extensive parallel operations. HDLs include an explicit notion of time, a primary attribute of hardware, which further distinguishes them from most software programming languages.
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Programming languages
There are several advantages to having a built-in language in the electrical circuitry of a computer. Firstly, it enables faster communication between the computer and its operator. Secondly, it simplifies the process of programming the computer since all the necessary instructions are readily available. Finally, it ensures compatibility with other computers that use the same language. However, there are also some drawbacks. For instance, if the operator is unfamiliar with the language, the computer may become more challenging to operate. Additionally, if the language is poorly designed, programming the computer can become more difficult. Furthermore, changes made to the language may result in compatibility issues with other computers using the same vocabulary.
Hardware description languages (HDLs) are commonly used in modern digital design to describe the functionality of digital circuits and can be considered a form of programming the electrical circuitry of computers. HDLs facilitate the automated analysis, simulation, and synthesis of electronic circuits. The two dominant HDLs in the electronics industry are VHDL and Verilog, which are used depending on available software tools and designers' experience. HDLs resemble programming languages like C or ALGOL, employing textual descriptions that include expressions, statements, and control structures. One key distinction is that HDLs explicitly incorporate the notion of time.
While HDLs and programming languages have distinct purposes, they share similarities and borrow concepts from each other. HDLs focus on logic synthesis, transforming code into physical gate netlists, while software compilers convert source code into object code for specific microprocessors. As the boundaries between HDLs and programming languages blur, the integration of software development principles into hardware design streamlines the process and emphasizes automation, reusability, and validation.
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Control circuitry
Electrical circuitry is an integral part of modern technology, and within this, control circuitry plays a crucial role. Control circuitry is one of the two main types of circuitry in computers, the other being arithmetic logic circuitry. Control circuitry is responsible for fetching instructions from memory and interpreting them for execution. This type of circuitry regulates and manages the operation of an electrical circuit by turning it on or off and controlling voltage and current.
Control circuits can range from simple two-wire on/off devices to more complex three-wire circuits with multiple pushbutton locations and motors that start in sequence. They are designed to operate at a lower voltage than the motor or power circuit they control, ensuring safety and ease of installation. This voltage difference allows operators to use a low-voltage pushbutton to energize a higher-voltage motor or circuit.
The power for a control circuit can be supplied in various ways. One method involves using a control transformer to step down the line voltage, typically to 120V AC, before connecting it to the control circuit. This transformer acts as the source of supply and must be sufficiently sized to power the motor starter and associated equipment such as relays, timers, or pilot lights.
In terms of safety, control circuits are crucial. They help prevent dangerous faults and high-voltage switching near operators. Control circuits are designed to meet specific safety standards, such as ensuring that ground faults do not lead to unintended start-ups or hazardous machine motions. To achieve this, control circuits may be operated as grounded (TN) or ungrounded (IT) systems, with ungrounded systems often preferred for safety, failure prevention, and cost reduction.
Additionally, control circuitry is closely associated with hardware description languages (HDLs). HDLs, such as VHDL and Verilog, provide a way to describe the functionality and behaviour of electronic systems over time. They enable precise descriptions of circuits, facilitating automated analysis, simulation, and synthesis. HDLs are integral to electronic design automation (EDA) systems, especially for complex circuits, and they continue to evolve and influence the field of electrical circuitry.
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Arithmetic logic circuitry
The electrical circuitry of a computer consists of two main types of circuitry: control circuitry and arithmetic logic circuitry. The latter is a fundamental building block of computers and performs arithmetic and bitwise operations on integer binary numbers.
An arithmetic logic unit (ALU) is a combinational digital circuit that performs arithmetic and bitwise operations on integer binary numbers. This is in contrast to a floating-point unit (FPU), which operates on floating-point numbers. It is a fundamental building block of many types of computing circuits, including the central processing unit (CPU) of computers, FPUs, and graphics processing units (GPUs). The inputs to an ALU are the data to be operated on, called operands, and a code indicating the operation to be performed (opcode). The ALU's output is the result of the performed operation.
In many designs, the ALU also has status inputs or outputs, or both, which convey information about a previous operation or the current operation, respectively, between the ALU and external status registers. A basic ALU has three parallel data buses consisting of two input operands (A and B) and a result output (Y). Each data bus is a group of signals that conveys one binary integer number. The opcode input is a parallel bus that conveys to the ALU an operation selection code, which is an enumerated value that specifies the desired arithmetic or logic operation to be performed by the ALU. The opcode size (its bus width) determines the maximum number of distinct operations the ALU can perform.
Arithmetic circuits are fundamental blocks in digital systems and are used for arithmetic operations such as addition, subtraction, multiplication, and division. These circuits constitute the major stream of computation in different applications such as processors, digital signal processing units, and calculators. Arithmetic circuits involve logic gates that deal with binary data, which in turn enables them to perform calculations with great precision.
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HDLs vs programming languages
Hardware Description Languages (HDLs) are specialized computer languages used to describe the structure, behaviour, and timing of electronic circuits. HDLs are used to design processors, motherboards, CPUs, and other digital circuits. HDLs are also used to simulate the circuit and verify its response before physical implementation. HDLs resemble high-level programming languages such as C, Python, or ALGOL, but there are fundamental differences. HDLs are specifically designed for hardware modelling, while programming languages are used for a wide range of computational tasks. HDLs excel at expressing parallel operations, a feature that distinguishes them from traditional programming languages, which primarily represent sequential operations. HDLs also include an explicit notion of time, a primary attribute of hardware.
Programming languages are versatile tools that can be used for a variety of applications beyond hardware design. They are designed to be used for a wide range of programming tasks and can be applied in different domains. Examples of commonly used programming languages include C, C++, Java, Python, and PHP.
HDLs and programming languages serve different purposes and operate at different levels of abstraction. HDLs are specialized for hardware design, modelling concurrent operations, and supporting simulation and synthesis into physical circuits. HDLs are crucial for hardware modelling and verification, enabling engineers to work at a higher level of abstraction and increase design capacity.
While HDLs may seem similar to programming languages, they are classified as specification languages or modelling languages. HDLs are designed to describe and model hardware circuits, while programming languages are used to create software that runs on pre-existing hardware. HDLs provide a precise, formal description of an electronic circuit, allowing for automated analysis and simulation. HDLs are used to write executable specifications for hardware, while programming languages define algorithms, data manipulation, and control flows that instruct processors on how to execute tasks.
In summary, HDLs and programming languages have distinct purposes and applications. HDLs are specialized languages for hardware design and modelling, while programming languages are versatile tools for creating software applications. HDLs excel at describing and simulating electronic circuits, while programming languages offer flexibility and high-level abstractions for a wide range of computational tasks.
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Frequently asked questions
There are several languages built into the electrical circuitry of a computer, including assembly language, machine language, compiled language, high-level language, and interpreted language.
There are several advantages. Firstly, it allows for faster communication between the computer and its operator. Secondly, it makes programming the computer easier as all the necessary instructions are already available. Lastly, it ensures the computer will be compatible with other computers that use the same language.
HDLs are used to describe the functionality of digital circuits and can be thought of as a way of programming the electrical circuitry of a computer. HDLs enable a precise, formal description of an electronic circuit, allowing for automated analysis, simulation, and synthesis of the circuit. The two most common HDLs are Verilog and VHDL.
