Jun 1, 2020 · In verilog, we use a construct called a module to define this information. The verilog module is equivalent to the entity architecture pair in VHDL. The code snippet below shows the general syntax for the declaration of a module in verilog.

A module is a block of Verilog code that implements a certain functionality. Modules can be embedded within other modules and a higher level module can communicate with its lower level modules using their input and output ports. Syntax. A module should be enclosed within module and endmodule keywords.

Aug 24, 2016 · I have seen two ways of declaring a module in verilog. The first reminds me of Traditional C, such as the examples on wikipedia: module toplevel(clock,reset); input clock; input reset; /* snip */ endmodule

Apr 19, 2025 · module half_adder (input a,b, output sum,carry); assign sum = a ^ b; assign carry = a & b; endmodule. This is the highest level of abstraction in Verilog. At this level the designers describe the functionality of the circuit without specifying the functionality and structure of …

Input ports pass signals from externally connected signals. While writing a module, the designer needs to make sure what type of signals have to be connected to the module’s inputs and outputs and follow the below rules.

Dec 26, 2023 · In this article, we have explored the basics of Verilog module syntax, the role of inputs and outputs, the use of parameters and local variables, module instantiation examples, and advanced module functionality.

Syntax of a Verilog Module. A Verilog module is defined using the keywords module and endmodule. The module name comes after the module keyword, and the ports (input and output) are optionally listed in parentheses. Inside the module, you define its behavior using procedural blocks like always or initial. Here’s the basic structure:

Ports of an instantiated module can be connected to signals referenced in the module’s declaration assuming they are in the same order but this is dangerous so don’t do it. Instead write out both the port name and the connected signal as shown below. module abc (in1, in2, out); input in1; input in2; output out; ... // Don’t use this method!

Ports can be associated by order or by name. You declare ports to be input, output or inout. The port declaration syntax is : 1 input clk ; // clock input. 2 input [15:0] data_in ; // 16 bit data input bus. 3 output [7:0] count ; // 8 bit counter output.

Aug 10, 2021 · Module module keyword is used to declare a module which is the basic building block of verilog code. A module always have a associated endmodule keyword, which marks end of the module.