Pavel

The “Light Code Block” plugin is a simple and lightweight solution for inserting and displaying code snippets in posts and pages. 
It works by adding a custom “LC” button to the TinyMCE (Classic) editor or a code block in the Gutenberg editor.
The inserted code will be shown on the front end in a clean, readable format.
<h3>Usage</h3>
<ul>
<li>Install and activate the plugin.</li>
<li>Go to the post or page edit screen.</li>
<li>In the TinyMCE (Classic) editor, click the “LC” button in the toolbar.</li>
<li>In the popup window that opens, paste or write your code, and click OK.</li>
<li>Save or update your post.</li>
</ul>
The code will be saved inside a special block and displayed on the front end within a <code><pre></code> tag with the class <code>mce-simple-code-block</code> (i.e., <code><pre class="mce-simple-code-block">...</pre></code>).
To insert code using the Gutenberg editor, you first need to add a Classic (TinyMCE) block, and then use it to insert your code.

Light Code Block

The "Light Code Block" plugin is the simplest and lightest plugin for inserting and displaying code.

Carlos Ramos

This plugin enables the syntax colorization for the VHDL and Verilog languages by extending the <a href="https://wordpress.org/extend/plugins/syntaxhighlighter/" rel="ugc">Syntax Highlighter Evolved</a> functionality (and thus, you need to have it installed).
For VHDL examples you can check some of my posts at <a href="http://www.estadofinito.com/divisor-frecuencia-vhdl/" rel="nofollow ugc">Estado Finito</a>. Here is another example, using the Xilinx UCF and VHDL coloring: <a href="http://www.estadofinito.com/reloj-digital/" rel="nofollow ugc">another awesome example</a>.
For Verilog examples, you can pay a visit to <a href="http://beyondallrepair.com/2012/04/counting-leds-on-a-digilent-atlys/" rel="nofollow ugc">Beyond All Repair</a> or <a href="http://idle-logic.com/2010/03/22/cyclone-ii-breakout-board-demo/" rel="nofollow ugc">Idle Logic</a>.
<h4>The people behind it</h4>
<ul>
<li>The VHDL brush is an adaptation done by me of the <a href="http://peej.github.com/phpdoctor/examples/geshi/source/geshi/vhdl.php.html" rel="nofollow ugc">GeSHi syntax by Alexander ‘E-Razor’ Krause</a>. It can be used as language=”vhdl” or with the shortcode [vhdl] … all code … [/vhdl].</li>
<li>The Verilog brush was made by Harry Rose at <a href="http://beyondallrepair.com/2012/05/javascript-syntax-highlighting-for-verilog/" rel="nofollow ugc">Beyond All Repair</a>. I am just merely putting it into this plugin.</li>
<li>The Xilinx UCF support is my work, although it works for the basic stuff. And basic means colorization for NET, LOC, and comments.</li>
</ul>
Hope it can be of use to any digital designer out there. Need another language or more features? Don’t hesitate to ask!

SyntaxHighlighter Evolved: VHDL Brush

Adds support for the VHDL and Verilog languages to the SyntaxHighlighter Evolved plugin. Also, includes basic syntax coloring for Xilinx UCF files.

Light Code Block vs SyntaxHighlighter Evolved: VHDL Brush