Also the Tina designer program from Designsoft supports hierarchical structures in a parallel programming way. I recently started creating sub-circuits (called Macros in Tina) which afterwards can be given a component symbol (like in Quartus but with more options by using a special Tina Symbol designer program).
The best part is that it works both ways, you can make a Macro from any drawn circuit, but also design an empty Macro symbol and insert a VHDL circuit code to it to create your (sub-)circuit. But in case you want to make a VHDL conversion from your designed circuit it of course has to be a purely digital circuit! (VHDL simply doesn't support analogue components).

And the best part is that while creating very big top-level Macros (big higher hierarchy circuits), Tina supports an unlimited amount of these sub-circuits!

Creating is big much fun in Tina and it supports simulation of both analogue and digital circuits (by using Scope Wave diagrams and other virtual measuring ways). Plus Mixed mode designing and simulation. Whereas Quartus is only capable of designing digital sub-circuits. Tina costs about 600 euro including the HDL software part. But that also depends on what version you buy. Quartus is free in its Web II/ Lite edition.

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Indeed Venu. Not many people know about VHDL or how to program new circuits in it. At least not the people I know, like my electro/electronic educated friends. I didn't either until about a few years ago when a got interested in a completely in VHDL programmed Floppy Diskdrive Simulator. But I'm sure that if they knew what VHDL can do for them they sure would be interested too! See for instance here about the in VHDL manufactured Disk Drive controllers: http://www.lotharek.pl/product.php?pid=13

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I could not have said it better. Thank you.

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Hi albert it is intresting to know about VHDL.
thanks

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Hi Parasuraman S. Indeed programming all kinds of devices is almost
impossible to accomplish. VHDL (or the shorter equally interesting
notation Verilog) is however a completely new language, but not because
of the language itself, but much more because of the way it is used.
And really was 'invented' just around 1987 by USA Defence to make it much
easier to create and reprogram old circuits to new uses. And today also in
a way reduces the Electronic waste of Hardware if used properly. I take
it that BPL just means Binary Programming Language. Speaking or writing
German to me is easy, but I like VHDL much more! By-the-way: I guess that
you already knew that 'Bit' comes from the words Binary Digit?

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Thank you Mr. Ulises. Glad that you liked it!

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Hi Robert, Me neither. I'm still learning.

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