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Hey, i have this problem when i want to do the following thing:

I have this serial input (let's call it a) and i want to see the serial
input a through an IO provided on my evaluation board (let's call that pin
atest) and i did it like this

entity testmodule is
port(
a, clk: in std_logic;
b, atest: out std_logic
);
end testmodule;

architecture Behavioral of testmodule is

begin

-- the rest of the program to get a =>b

--with this process i want to feed the input a to and debug output atest
which it clocked on the clk (which is a lot
--faster than the serial clock so there should be no problem there
process(clk)
begin
if (clk'event and clk='1') then
atest<=a;
end if;
end process;

--OR can i just write the following;
atest<=a;

end Behavioral;

so i used a process to bring a => atest as a first method and then atest<=a
as a second method.
How come neither of these methods work??? did i miss something?

thanx in advance;

Yttrium

I'm guessing this produces a multiple drivers error in synthesis.
Is this what you meant by "How come neither of these methods work???"


Yttrium wrote:
>
> Hey, i have this problem when i want to do the following thing:
>
> I have this serial input (let's call it a) and i want to see the serial
> input a through an IO provided on my evaluation board (let's call that pin
> atest) and i did it like this
>
> entity testmodule is
> port(
> a, clk: in std_logic;
> b, atest: out std_logic
> );
> end testmodule;
>
> architecture Behavioral of testmodule is
>
> begin
>
> -- the rest of the program to get a =>b
>
> --with this process i want to feed the input a to and debug output atest
> which it clocked on the clk (which is a lot
> --faster than the serial clock so there should be no problem there
> process(clk)
> begin
> if (clk'event and clk='1') then
> atest<=a;
> end if;
> end process;
>
> --OR can i just write the following;
> atest<=a;
>
> end Behavioral;
>
> so i used a process to bring a => atest as a first method and then atest<=a
> as a second method.
> How come neither of these methods work??? did i miss something?
>
> thanx in advance;
>
> Yttrium

--
/ 7\'7 Paulo Dutra ()
\ \ ` Xilinx
/ / 2100 Logic Drive http://www.xilinx.com
\_\/.\ San Jose, California 95124-3450 USA

well,when i let synthesis en implementation do their thing in ISE 5.2i they
don't give any problem ... (no errors and no warnings concerning this) ...
and i tried the one without the process once on a spartanIIE and gave no
problems and the first time it worked on the virtexII but when we used the
same method again a few hours later it did nothing, every signal remained
unchanged...


"Paulo Dutra" <> wrote in message
news:...
> I'm guessing this produces a multiple drivers error in synthesis.
> Is this what you meant by "How come neither of these methods work???"
>
>
> Yttrium wrote:
> >
> > Hey, i have this problem when i want to do the following thing:
> >
> > I have this serial input (let's call it a) and i want to see the serial
> > input a through an IO provided on my evaluation board (let's call that
pin
> > atest) and i did it like this
> >
> > entity testmodule is
> > port(
> > a, clk: in std_logic;
> > b, atest: out std_logic
> > );
> > end testmodule;
> >
> > architecture Behavioral of testmodule is
> >
> > begin
> >
> > -- the rest of the program to get a =>b
> >
> > --with this process i want to feed the input a to and debug output atest
> > which it clocked on the clk (which is a lot
> > --faster than the serial clock so there should be no problem there
> > process(clk)
> > begin
> > if (clk'event and clk='1') then
> > atest<=a;
> > end if;
> > end process;
> >
> > --OR can i just write the following;
> > atest<=a;
> >
> > end Behavioral;
> >
> > so i used a process to bring a => atest as a first method and then
atest<=a
> > as a second method.
> > How come neither of these methods work??? did i miss something?
> >
> > thanx in advance;
> >
> > Yttrium
>
> --
> / 7\'7 Paulo Dutra ()
> \ \ ` Xilinx
> / / 2100 Logic Drive http://www.xilinx.com
> \_\/.\ San Jose, California 95124-3450 USA