All about VHDL Files

The VHDL file type is primarily associated with Quartus.

VHDL	File extension: VHDL
	File type:	hardware design script

What is a VHDL file?

VHDL files mostly belong to Quartus by Intel. VHDL is a programming language for designing, simulating, optimizing, and verifying digital systems such as Systems on a Chip, logic gates, and integrated circuits. VHDL is short for VHSIC Hardware Description Language. The language was standardized by the Institute of Electrical and Electronics Engineers. A hardware design script written in VHDL is saved in a VHD file. This script contains strongly typed statements representing a model which describes a logic circuit. Hardware development environments such as ModelSim, DirectVHDL, and Vivado have native VHDL support.

How can I open a VHDL file?

You need a suitable software like Quartus to open a VHDL file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your VHDL file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a VHDL file directly in the browser:. Just drag the file onto this browser window and drop it.

Online VHDL Text Viewer

Choose your .vhdl file to analyze

or drag and drop it here

Online File Viewer

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VHDL format details:

If you can determine the file format, the associated program can also be determined. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. If the file extension or signature does not match the file format, errors will occur when opening or editing the file. So you need a detailed analysis of a file to find out the format and the associated program. Below is our analysis of the VHDL files:

VHDL is not a commonly used file extension and predominantly uses a uniform format. But the following two file formats are common:

• 65% of all VHDL files start with the magic bytes library , which are always the first bytes of this file format. The contents of these files are easily readable with a text editor. The files are often between 290 bytes and 1 KB in size. The file type is relatively new. Certain words are almost always found in the files, such as use IEEE.STD_LOGIC_1164.ALL;, library IEEE;, entity, use IEEE.NUMERIC_STD.ALL;, Port (, 15 downto 0, STD_LOGIC_VECTOR(15 downto, in STD_LOGIC_VECTOR, out STD_LOGIC_VECTOR and architecture. A usual file name is backdoor.vhdl or key.vhdl. Such files are related to encryption.
• 15% of all VHDL files belong to VHSIC Hardware Description Language. The contents of these files can even be read by a human. The files are on average 3 KB in size and range from 400 bytes to 15 KB. The keywords entity, library ieee;, use ieee.std_logic_1164.all; and port are typical for these files.

The remaining 20% of all VHDL files are files with no common format, such as LIBRARY. Files like these are sometimes linked to counter. You can get all the details of your VHDL file by dragging it onto this page or by clicking the button "Choose your .vhdl file to analyze" above.