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.
I’m excited to announce that the VHDL and FPGA course that I have been working on for the last six months is starting to become complete. The course is in beta at the moment, and I am planning on launching it for the first time this autumn. Who is the FPGA course for? The FPGA…
Creating modules is a great way to reuse code, but often you need the same module with smaller variations throughout your design. This is what generics and the generic map are for. It allows you to make certain parts of the module configurable at compile-time. Constants are used when we want to avoid typing the…
When learning a new programming language, I always like to start by learning how to print. When you master outputting “Hello World!”, you know that you’ve got the environment working. It also shows you the basic skeleton of the language, the bare minimum code required to produce any output. You might be thinking: but VHDL…
The linked list is a dynamic data structure. A linked list can be used when the total number of elements is not known in advance. It grows and shrinks in memory, relative to the number of items it contains. Linked lists are most conveniently implemented using classes in an object-oriented programming language. VHDL has some…
A convenient way to populate block RAM with initial values is to read binary or hexadecimal literals from an ASCII file. This is also a good way to create a ROM (read-only memory) in VHDL. After all, RAM and ROM are the same thing in FPGAs, ROM is a RAM that you only read from….
Pulse-width modulation (PWM) is an efficient way to control analog electronics from purely digital FPGA pins. Instead of attempting to regulate the analog voltage, PWM rapidly switches on and off the supply current at full power to the analog device. This method gives us precise control over the moving average of energy provided to the…
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.