Re: [myhdl-list] Floating Point MEP

[Tom D. <td...@di...>]

Hi,

A couple of quick comments;

We have had the discussion about being able to group signals. That would 
be a good thing to have, I would use it for complex numbers all the 
time. It only really matters at the top level I/O, as conversion and 
simulation will choke. I pass around an object of a complex class to 
make internal connections and that works great, then break them out at 
the top level.

My other 2 cents is, for something as complex as a floating point 
operator, say multiply I don't think you would have much luck overriding 
the operator as in:

c = a * b

I think you really want a module instantiation, since you want to be 
able to pass parameters along with the signals. Such as number of 
pipelines, type of rounding and so on. That would lead to a much more 
worth while library component.

Tom





On 04/24/2012 05:53 AM, Christopher Lozinski wrote:
> Here is a MEP for floating point numbers.
>
> http://wiki.myhdlclass.com:8080/FloatingPoint
>
> The basic idea is to create a new signal type, float, out of sign, 
> mantissa and exponent signals. In MyHDL model the calculation using 
> python floating point operators with the appropriate delay. When 
> exporting it call an existing Verilog or VHDL library. The big change 
> is that MyHDL would need to understand hierarchical signals. Maybe it 
> is not that hard. When dealing with a signal in a sensitivity list, 
> MyHDL would first check it it were hierarchical, if it were, MyHDL 
> would add all of the sub signals to the sensitivity list. And from 
> there MyHDL could continue operating as before.
>
> If you are interested, I invite you to read the details in the MEP.
>
> http://wiki.myhdlclass.com:8080/FloatingPoint
>
> -- 
> Regards
> Christopher Lozinski
>
> Check out my iPhone apps TextFaster and EmailFaster
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>
> Expect a paradigm shift.
> http://MyHDL.org
>
>
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