Re: supported operators for Signal class

Oscar Daniel Diaz <[email protected]> Mon, 11 Apr 2016 15:46:44 -0500
Newsgroups	gmane.comp.python.myhdl
Message-ID	<[email protected]>
El Lun 11 Abr 2016 17:36:56 David Stanford escribió:
> I'm trying some tests converting python code to MyHDL code that generates
> real hardware. As a hardware designer, I know some of these tests are going
> to be foolish first steps to make, 

First of all, beware! You're doing conversion to generate real hardware. That 
means the sythesizable operand list is very limited. In particular, you cannot 
synthesize multiplications, divisions and powers (at least with common VHDL 
and Verilog synthesizers, possibly that won't be true with HLLs or High-Level 
Logic synthesizers).

If you're doing simulation only, you would be fine.

> Which leads to the question, what operand types ARE supported for Signals?
> This feels like an obvious question, but I can't seem to find an answer
> anywhere in the documentation.

In reality, the supported operands are related to the underlying type of the 
Signal object, in your example, that would be intbv. You can create Signals 
with int, or any other python data type.

Regarding the intbv type, you can check the source file _intbv.py, and look for 
the operand methods available[1]. I saw all implemented methods for integers, 
so an intbv should behave as an int (as the documentation say). 

[1] https://docs.python.org/2/reference/datamodel.html#emulating-numeric-types

> Am I searching poorly looking for a list of operators that works between
> signals, or does such a table not exist? Should it?

Due to the syhthesizable code restriction I can say addition, subtraction, 
logic (and, or, xor, not) and shifts are probably the only operands supported 
for conversion.

> Thanks,
> 
> Dave Stanford
> 
> 
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