Test your progress with this VHDL quiz after completing part 4 of the Basic VHDL Tutorial series!
[wpViralQuiz id=15773]
Test your progress with this VHDL quiz after completing part 4 of the Basic VHDL Tutorial series!
[wpViralQuiz id=15773]
I’m from Norway, but I live in Bangkok, Thailand. Before I started VHDLwhiz, I worked as an FPGA engineer in the defense industry. I earned my master’s degree in informatics at the University of Oslo.
In the previous tutorial we learned how to delay time using the wait for statement. We also learned about the process loop. We now know that if we let it, the process “thread” will loop within the process forever. But what if we want to do something just once at the beginning of the process?…
A module is a self-contained unit of VHDL code. Modules communicate with the outside world through the entity. Port map is the part of the module instantiation where you declare which local signals the module’s inputs and outputs shall be connected to. In previous tutorials in this series we have been writing all our code…
In short, VHDL is a computer language used for designing digital circuits. I use the term “computer language” to distinguish VHDL from other, more common programming languages like Java or C++. But is VHDL a programming language? Yes, it is. It’s a programming language that is of no use when it comes to creating computer…
This tutorial teaches you how to set up an automation server on a Virtual Private Server (VPS) using Jenkins, Xilinx Vivado, and the Git / GitHub source-control management (SCM) system.
Jenkins can be a valuable tool also for FPGA teams. Automating tasks can save your company time and improve the quality of your code. By using automatic build triggers and automated job pipelines, fewer coding errors will go unnoticed.
The ModelSim version that comes with Intel Quartus Prime Lite Edition is a good alternative if you want to try out VHDL simulation on your home computer. The software is available for both Windows and Linux, but Intel only supports Red Hat-based distros like CentOS Linux. Fortunately, you are just a few hacks away from…
It is possible to drive external signals from a procedure. As long as the signal is within the scope of the procedure, it can be accessed for reading or writing, even if it isn’t listed in the parameter list. Procedures that are declared in the declarative region of the architecture, cannot drive any external signals….
This is the most extensive course VHDLwhiz has ever made.
First of all, thank you so very much!
These are by far the most comprehensible tutorials I have come across like ever!
Brilliant work.
So here my two cents out of gratitude:
Basic VHDL Quiz – part 4
Which statement is not true?
Answer 3 : The return statement cannot be omitted.
-> Correct
So the return statement CAN be omitted???
“Unlike in most other programming languages, the return keyword is mandatory in functions in VHDL.”
Confused by double negation. Me or you 😉
Good catch! I’ve changed the answer now. I was trying to make you think, but in the process I confused myself too 🙂
“The return-keyword cannot be used in a procedure”. I believe that this is incorrect, e.g.
https://web.archive.org/web/20200629023040/http://vhdl.renerta.com:80/source/vhd00060.htm
It is true, of course, that you cannot return a value with it, that’s the only (?) difference between procedures and functions. But, as in other languages, you can use “return” as control flow statement to “force an exit”.
You are right! I missed the possibility of using return statements in procedures without returning a value. According to the Renata link you posted, functions must return a value, while procedures can have return statements, but then without a return value.
I am changing this question.