Why verilog

Using VHDL affords the user concurrent system descriptions. VHDL is a dataflow language, which means it can simultaneously consider every statement for execution. Each of these languages runs a sequence of statements, both sequentially and a single instruction at a time. One of the more advantageous benefits of VHDL is that its projects are multipurpose; you create the project once and you can utilize the calculation block in various other projects. This means you have the ability to make changes, such as to parameters, element base, memory size, block composition, interconnection structure, and capacity.

It employs a textual format to describe electronic systems and circuits. In the area of electronic design , we apply Verilog for verification via simulation for testability analysis, fault grading, logic synthesis, and timing analysis. Verilog is also more compact since the language is more of an actual hardware modeling language. As a result, you typically write fewer lines of code, and it elicits a comparison to the C language.

However, Verilog has a superior grasp on hardware modeling as well as a lower level of programming constructs. Verilog is not as wordy as VHDL, which accounts for its compact nature. It received its first publication in , with a subsequent revision in SystemVerilog, which is the revision of Verilog, is the latest publication of the standard.

Note: The PLI is a collective of software routines that allows a bidirectional interface between other languages such as C and Verilog.

Strongly typed. Weakly typed. Easier to understand. Less code to write. More natural in use. More of a hardware modeling language. Non-C-like syntax. Similarities to the C language. Variables must be described by data type.

A lower level of programming constructs. Widely used for FPGAs and military. A better grasp on hardware modeling. More difficult to learn. Simpler to learn. Logical operators are generally, used in conditional statements since they work with expressions. Reduction operators are the unary form of the bitwise operators and operate on all the bits of an operand vector. These also return a single-bit value. Shift operators, which are shifting the first operand by the number of bits specified by second operand in the syntax.

Vacant positions are filled with zeros for both directions, left and right shifts There is no use sign extension. Conditional operator synthesizes to a multiplexer. Literals are constant-valued operands that are used in Verilog expressions. Bit-selects and part-selects are also used as operands in expressions in the same way that their main data objects are used.

In the Function calls, the return value of a function is used directly in an expression without the need of first assigning it to a register or wire.

It just place the function call as one of the type of operands. In Verilog, A module is the principal design entity. This indicates the name and port list arguments. The default port width is only 1 bit. The port variables must be declared by wire, wand,. The default port variable is wire. Normally, inputs are wire because their data is latched outside the module.

Outputs are of reg type if their signals are stored inside. The continuous assignment in a Module is used for assigning a value on to a wire, which is the normal assignment used at outside of always or initial blocks. This assignment is done with an explicit assign statement or to assign a value to a wire during its declaration. Continuous assignment are continuously executed at the time of simulation. The order of assign statements does not affect it.

If you do any change in any of the right-hand-side inputs signal it will change a left-hand-side output signal. Module declarations are templates for creating actual objects. Modules are instantiated inside other modules, and each instantiation is creating a single object from that template. The exception is the top-level module which is its own instantiation. By position , placing the ports in the same place in the port lists of both of the template and the instance.

Previous Page. Next Page. In Verilog, the language is more compact, as the Verilog language is more of a hardware modeling language. You will end up typing few lines of code and it draws similarities to the C language. Verilog has a better grasp on hardware modeling, but has a lower level of programming constructs. There are some similarities, but they are overshadowed by their differences.

The layout of these programs are very similar; you can reasonably follow what each version of the code is doing. This rides on the readers. Weigh in on why you like each programming language, and which one you prefer the most. This is a good opportunity to share some insight on to what beginners should look out for when starting to pick up VHDL or Verilog.

If you want to see either language in action, check out some of the learn projects we have on VHDL and Verilog! Also check out some of our popular projects that use each language.

Kaitlyn, a longtime supporter of Verilog details on Instructables some of the awesome things you can do with this powerful tool. This includes controlling servos on your FPGA! Here she demonstrates how she used the Basys 3 and Verilog to control the motion required for the Claw Game Demo. I am studying Electrical Engineer at the University of Idaho.

I have always been interested in technology, video games, science and learning new things. I have a thirst for self discovery and learning new things about myself. Bringing joy or making others feel happy gives me a great pleasure. You can usually get me interested in an activity that has a more hands on approach.

I will always try and strive to be the best person I can be. But knowing that the reverse tends to be true more lines of code equating to more clarity for coding and looking that the VHDL to Verilog comparison for a MUX, I can definitely see how the VHDL makes a little more sense, even to the untrained eye at least I think it does.