Re: [myhdl-list] Starting with MyHDL and trying to do my Cordic Module

[André P. <and...@gm...>]

I meant that you can't do this in VHDL but I thought that in MyHDL you
could do that.

Thanks for the Explanation, I look forward to translate the code of my
product from VHDL to MyHDL :), still in the learning process but the power
of Python makes VHDL looks out dated hehe.

Cheers


On Fri, Jul 4, 2014 at 9:33 AM, Christopher Felton <chr...@gm...>
wrote:

> On Fri, Jul 4, 2014 at 6:50 AM, André Prado <and...@gm...>
> wrote:
>
>> So, I can't use the same signal as a signal and a variable. Just like
>> VHDL :)
>>
>
> Not sure what you mean?  You can mix the signal assignment
> and variable assignment in VHDL?  If you declare a signal you
> need to use "<=" if a variable ":=".
>
> MyHDL only has one assignment operator, "=".  But the types
> need to match.  You need to determine if you really want a signal
> or a variable:
> http://www.jandecaluwe.com/hdldesign/signal-assignments.html
>
>
>>
>> What is the difference between assigning a value with [:] and without it?
>> All the intbv values need a [:] ?
>>
>
> In Python everything is a reference
>
>     x = intbv(0, min=-4, max=4)
>     y = intbv(0, min=-8, max=8)
>     # ...
>     x = 2
>     y[:] = 4
>     assert isinstance(x, intbv)   # will fail
>     assert isinstance(y, intbv)   # will pass
>
> The [:] indicates you are updating the value of the intbv type
> (updating all the bits).  If you didn't do this you would loose the
> intbv information, because the reference would be assigned to
> another type.  But in our HDL we need to know the types we are
> dealing with (we remove some of the dynamicism :)
>
> Yes, all "variable" intbv need "[:] = <new value>".
>
> I made changes to your original and it converts, but I did not
> check if it still passes the testbench:
> http://www.edaplayground.com/x/eW
>
> Note: conversion to Verilog will fail to compile with a Verilog
> compiler because some of the signal/variable names are reserved
> words (e.g. "real").  It has been on our todo list to check for
> reserved words in conversion.
>
> Regards,
> Chris
>
>
>
>
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-- 
Atenciosamente/Regards
André Castelan Prado