Basics of Verilog
Verilog is a hardware description language, we can describe a hardware in a text and later we can synthesis text to generate netlist which will later generate a hardware. We can describve any digial system (hardware) in Verilog. When you start learn Verilog it is must that you should learn basics.
File Extension
Each verilog file has extension of dov v (filename.v)
Comments
Like C/C++, Verilog also has single line and multi-line comment.
- //This is single line comment
- /* This is multi-line comment */
Module
Module is a piece of hardware in Verilog. Each verilog syntax start with module and ends with endmodule
Module name
Each and every module in verilog has uniques name. If your design uses more than one module, then each module should have unique module name.
Port Declaration
As any hardware has input and output ports simillarly, module also has input and output port declaration and it must be declared (Except test bench). Input port is declared using input keyword and output is declared using output keyword.
Hardware description
Hardware is described inside the module and endmodule. The description of the hardware can be any modeling type (structural, data flow or behavioural)
Example
Let us describe a half adder using Verilog HDL.
- Let's create a module
- Let us choose halfadder as module name
- Half adder has two inputs a and b and two outputs sum and carry let's declare it.
- Boolean expression of full adder is $$sum = a \oplus b$$ $$carry = ab$$ let's describe it.
Click like if you found this useful
Add Comment
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
- Your name, rating, website address, town, country, state and comment will be publicly displayed if entered.
- Aside from the data entered into these form fields, other stored data about your comment will include:
- Your IP address (not displayed)
- The time/date of your submission (displayed)
- Your email address will not be shared. It is collected for only two reasons:
- Administrative purposes, should a need to contact you arise.
- To inform you of new comments, should you subscribe to receive notifications.
- A cookie may be set on your computer. This is used to remember your inputs. It will expire by itself.
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
- Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time.
- You acknowledge that all comments express the views and opinions of the original author and not those of the administrator.
- You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person's privacy.
- The administrator has the right to edit, move or remove any comment for any reason and without notice.
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments