What is Verilog — Definition, Features 2. Verilog is a case sensitive language which only uses lowercase. It supports simulation. In other words, it is possible to create a model of a function and simulate it before building the real system. The base language of Verilog is C. Therefore, a programmer who is familiar with C can learn Verilog quickly. First of all, let's discuss hardware modeling capacities of Verilog and VHDL since they are both hardware description languages for modeling hardware.
Graph source: Douglas J. It is reasonable because Verilog is originally created for modeling and simulating logic gates. In fact, Verilog has built-in primitives or low-level logic gates so that designers can instantiate the primitives in Verilog code while VHDL does not have it.
Verilog's gate primitives: and, nand, or, nor, xor, xnor, buf, not, bufif0, notif0, bufif1, notif1, pullup, pulldown. Verilog's switch primitives: pmos, nmos, rpmos, rnmos, cmos, rcmos, tran, rtran, tranif0, rtranif0, tranif1, rtranif1. This feature is especially necessary and popular for ASICs designers.
Below are Verilog examples on how to instantiate gate primitives in Verilog code:. High-level Modeling On the other hand, VHDL is better than Verilog in terms of high-level hardware modeling as illustrated in the mentioned graph. VHDL provides more features and constructs for high-level hardware modeling compared to Verilog. Following are major different features for supporting high-level hardware modeling when comparing VHDL with Verilog: User-Defined Data types in VHDL Verilog has very simple data types and it's all defined by Verilog language users cannot define their own data types in Verilog.
Verilog has two main data types including net data types for connecting components together such as wire most popular , wor, wand, tri, trior, etc. VHDL allows designers to define different types based on the predefined VHDL data types; this is a good feature for complex and high-level systems which may use many different data types. Below is an example VHDL code for defining new data types:. Packages in VHDL are commonly used for data types and subprograms' declaration. This makes the code harder to read.
Fix your VHDL example code. However, you cannot use it in the case statement. We have a reference app that provides all the keywords of both VHDL and Verilog, notes the equivalent in the other language when they exist , and gives a simple usage example. There is double the punctuation. Something being more verbose does NOT make it easier for me to understand.
I prefer compact designs. Your email address will not be published. Skip to content With the intense tune of Eye of the Tiger playing in the background, it is time to for this showdown to begin. This Pmod can then be used for a variety of applications…some even battle-related. Who is the True Champ? Hi, thanks for the article. Kind regards, LS. This gives you two things: 1. Leave a Reply Cancel reply Your email address will not be published. The strong- typing for VHDL also makes sure that datatypes are converted explicitly from one to another like for example bit-vector to an integer.
The VHDL language was designed in a manner that will make the semantics of the language very unambiguous and clear. The designs of VHDL are easily portable which also adds up the functionality to move from one tool to another very easily. Due to this, there is no necessity to be concerned about race conditions. Verilog is the HDL that is completely emerging and evolving in which new features are getting added continuously.
VHDL is a strongly typed language and is very verbose while Verilog is a weakly typed language and has all the predefined datatypes with it. Simulation control is not supported by the VHDL internally as an in-built thing but Verilog has the facility of simulation support which helps in debugging the design-related problems easily with the help of waveforms that are displayed based on the database and can be analyzed further.
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