Re: [myhdl-list] MEP : Signal Containers

[Oscar D. <osc...@gm...>]

2011/11/15 Christopher Felton <chr...@gm...>:
> The following is a *start* to a MEP that describes the conversion
> support for classes, lists, and dictionaries.  This is just a start of
> the enhancement description and does not include some of the mechanical
> (code changes) items worth identifying in a MEP.

Thanks for making this draft. I'm mostly agree this MEP, I'll just add
some thoughts:

* Since a class could be more powerful than a list or a dict,
container classes should allow enhanced features i.e. custom naming
scheme. We can propose hidden methods to support that features, in a
similar way of the special methods from the python data model:

http://docs.python.org/reference/datamodel.html#special-method-names

Right now I'm thinking about

* It's not explicitly mentioned, but I guess the conversion step will
"flatten" the signal container. Although I agree on that, maybe we
could think about support to conversion to arrays or records (I speak
mainly for VHDL, I'm not that expert of Verilog).

* About the conversion of class methods, I think that should be in
another MEP, this one is to define signal containers. We should make
another MEP to add support for conversion of classes (not just class
methods). However, I do agree that the class methods must have support
for conversion, as you explained here, and I think it is easy to fix
the self argument issue in the conversion code.

That's all for now.

Best regards.

P.D.: Perhaps I can help with the VHDL code snippet:

VHDL example conversion.
.. code-block :: vhdl

entity foo is
    port (
        clk: in std_logic;
        MyObj_x: in unsigned(7 downto 0);
        MyObj_y: in unsigned(3 downto 0);
        MyObj_z: out unsigned(8 downto 0)
    );
end entity foo;

architecture MyHDL of foo is

begin

    RTL: process(clk) is
    begin
        if rising_edge(clk) then
            MyObj_z <= MyObj_x + MyObj_y
        end if;
    end process RTL;

end architecture MyHDL;


-- 
Oscar Díaz
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