Verilog - Hardware description language

Verilog is a hardware description language created in 1984 by Phil Moorby and Prabhu Goel.

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Verilog, standardized as IEEE 1364, is a hardware description language (HDL) used to model electronic systems. It is most commonly used in the design and verification of digital circuits at the register-transfer level of abstraction. It is also used in the verification of analog circuits and mixed-signal circuits, as well as in the design of genetic circuits.. Read more on Wikipedia...

Tags: hardwareDescriptionLanguage
There are at least 48,035 Verilog repos on GitHub
The Google BigQuery Public Dataset GitHub snapshot shows 2k users using Verilog in 3k repos on GitHub
There are 2,421 members in the Verilog subreddit
Explore Verilog snippets on Rosetta Code
Verilog on HOPL
Verilog ranks #50 in the TIOBE Index
Verilog Ubuntu package
ANTLR grammar for Verilog
CodeMirror package for syntax highlighting Verilog
Pygments supports syntax highlighting for Verilog
GitHub supports syntax highlighting for Verilog
Verilog appears in the Quine Relay project
Indeed.com has 246 matches for "verilog developer".
See also: (5 related languages) SystemVerilog, C, VHDL, OpenVera, Property Specification Language

Example from Riju:

module main;

initial begin
  $display("Hello, world!");
end

endmodule

Example from hello-world:

module main;
  initial
    begin
      $display("Hello World");
      $finish;
    end
endmodule

Example from the Hello World Collection:

/* Hello World in Verilog. */

module main;

 initial
   begin
     $display("Hello, World");
     $finish ;
   end

 endmodule

Example from Linguist:

`timescale 1ns / 1ps
// Copyright (C) 2008 Schuyler Eldridge, Boston University
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
module mux(opA,opB,sum,dsp_sel,out);
	input [3:0] opA,opB;
	input [4:0] sum;
	input [1:0] dsp_sel;
	output [3:0] out;
	
	reg cout;
	
	always @ (sum)
		begin
			if (sum[4] == 1)
				cout <= 4'b0001;
			else
				cout <= 4'b0000;
		end
	
	reg out;
	
	always @(dsp_sel,sum,cout,opB,opA)
		begin
			if (dsp_sel == 2'b00)
				out <= sum[3:0];
			else if (dsp_sel == 2'b01)
				out <= cout;
			else if (dsp_sel == 2'b10)
				out <= opB;
			else if (dsp_sel == 2'b11)
				out <= opA;
		end

endmodule

Example from Wikipedia:

initial
  a = 0;

initial
  b = a;

initial
  begin
    #1;
    $display("Value a=%d Value of b=%d",a,b);
  end

Verilog Keywords

always assign automatic begin case casex casez cell config deassign default defparam design disable edge else end endcase endconfig endfunction endgenerate endmodule endprimitive endspecify endtable endtask event for force forever fork function generate genvar if ifnone incdir include initial inout input instance join liblist library localparam macromodule module negedge noshowcancelled output parameter posedge primitive pulsestyle_ondetect pulsestyle_onevent reg release repeat scalared showcancelled signed specify specparam strength table task tri tri0 tri1 triand wand trior wor trireg unsigned use vectored wait while wire

Language features

Feature	Supported	Example	Token
Binary Literals	✓	// ([0-9]+)\|(\'b)[01]+
Integers	✓	// ([0-9]+)\|(\'d)[0-9]+
Floats	✓	// (\d+\.\d*\|\.\d+\|\d+)[eE][+-]?\d+[lL]?
Hexadecimals	✓	// ([0-9]+)\|(\'h)[0-9a-fA-F]+
Octals	✓	// ([0-9]+)\|(\'o)[0-7]+
Conditionals	✓
Functions	✓
While Loops	✓
Case Sensitivity	✓
Strings	✓	"Hello world"	"
MultiLine Comments	✓	/* A comment */	/* */
Print() Debugging	✓		$display
Line Comments	✓	// A comment	//
Comments	✓
Semantic Indentation	X