Error in VHDL code. Can anybody help me?

[robertobaenagalle]

Hi!

I've written some VHDL code and I got the following error message:

Error: Can't resolve multiple constant drivers for net sensor_sigte[1] at Simulacion_SSI.vhd(104)

Can anybody help me with this?
The code is posted below. If you need the complete program tell me and I'll send you. Of course I have posted here the part of the code I think is necessary for corrections.

Thanks!!!!!

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ETAPA_ENVIO: process -- LÍNEA 104
begin
wait until (step=2);
case (sensor) is
when 1 =>
control <= "01";
sensor_sigte <= 2;
when 2 =>
control <= "10";
sensor_sigte <= 3;
when 3 =>
control <= "11";
sensor_sigte <= 1;
end case;
irq_aux <= '1';
step_sigte <= 3;
data_paralelo_out <= data_paralelo_aux;
end process;

SINCRO: process (CLK_48M, RESET)
begin

if (RESET='1') then
step <= 1;
step_sigte <= 1;
sensor <= 1;
sensor_sigte <= 1;

elsif ((CLK_48M'EVENT) AND (CLK_48M='1')) then
control_ssi <= control; -- dato de sensor
data_paralelo <= data_paralelo_out; -- dato de posición
time_ssi <= contador_out; -- diferencia de tiempo
irq <= irq_aux; -- señal de interrupción para la CPU

sensor <= sensor_sigte;
step <= step_sigte;
end if;
end process;

 

[cippalippa]

Hi;

you cant't assign a variable value in two different process.

You assign:

sensor_sigte ; at the ETAPA_ENVIO process

and

sensor_sigte ; at the SINCRO process.

Try in this way:

ETAPA_ENVIO: process(RESET,step,sensor) -- LÍNEA 104
begin
if (RESET='1') then
sensor_sigte <= 1;
elsif (step=2);
case (sensor) is
when 1 => control <= "01"; sensor_sigte <= 2;
when 2 => control <= "10"; sensor_sigte <= 3;
when 3 => control <= "11"; sensor_sigte <= 1;
end case;
irq_aux <= '1';
step_sigte <= 3;
data_paralelo_out <= data_paralelo_aux;
end if;
end process;

SINCRO: process (CLK_48M, RESET)
begin
if (RESET='1') then
step <= 1;
sensor <= 1;
elsif ((CLK_48M'EVENT) AND (CLK_48M='1')) then
control_ssi <= control; -- dato de sensor
data_paralelo <= data_paralelo_out; -- dato de posición
time_ssi <= contador_out; -- diferencia de tiempo
irq <= irq_aux; -- señal de interrupción para la CPU
sensor <= sensor_sigte;
step <= step_sigte;
end if;
end process;

regards

Daniele

 

[robertobaenagalle]

Thank you Daniele,

You are right. I suppose I have made a typical beginner mistake... Anyway, I have now the key to go on... Thanks again

Roberto