Re: [myhdl-list] Manual update: rtl versus high level

[Christopher L. <loz...@fr...>]

On 5/6/12 6:05 AM, Jan Decaluwe wrote:

Those are all great steps in the right direction.

> I have separated the chapters about modeling in the manual.
> I have also added an introduction making it clear that
> high-level modeling is very useful, but not intended for synthesis.
>
>      http://www.myhdl.org/doc/dev/index.html
>

To write synthesizable models in MyHDL

please make it,

If you want to build an ASIC, or FPGA, use...

python guys are not quite sure what synthesizable means.  Specifically f
you gave me a test, I would not be able to distinguish synthesizable
logic from non-synthesizable logic. 
>
>   And I have further refined the What MyHDL is Not page.
>
>     http://myhdl.org/doku.php/whatitisnot#myhdl_is_not_only_for_implementation
>
 
And here are my comments on that page.

MyHDL is not a classic object-model of a digital circuit

In MyHDL hardware modules are modeled by functions, not objects. Signals
are arguments to that function, not instance variables of a class.  
There is no class called HardwareModule
<http://wiki.myhdlclass.com:8080/AtomicHardwareModule>.  If there were,
it would look like this.  http://wiki.myhdlclass.com:8080/OOHDL   While
Verlilog talks about Hardware module hierarchies, MyHDL has no parent
instance variable, there is no children instance variables. Indeed there
is no class to put them into.  There is no rich library of hardware
modules that subclass off of these classes. You cannot iterate over the
tree of hardware modules to calculate something.  By default, there is
no such tree, unless you build it yourself.    While MyHDL is written in
python, I would call it a functional approach to modelling a digital
design.  It is designed for hardware engineers, not experienced python
developers. 

It would be beyond awesome if you would add that to your wiki.  In the
meantime people can find a copy at:
http://wiki.myhdlclass.com:8080/WhatMyHDLisNot

Forgive me for being so direct.  I sincerely hope the feedback is helpful.

Thank you for listening, I am getting better at finding my voice.

-- 
Regards
Christopher Lozinski

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Expect a paradigm shift.
http://MyHDL.org