assigned a pin to ground

Question

Hi everyone,

I have a max10 FPGA and I want to assigned a pin to the gnd

Because my circuit is like this:

output pin(3.3V ) LED power supplied(3.3V)

so If I want to light up my LED, I should have an output pin=0V. I've try some VHDL code, it seems it doesn't work

library ieee;

use ieee.std_logic_1164.all;

ENTITY et IS

PORT(

s : out std_logic );

END et ;

ARCHITECTURE data_flow OF et IS

BEGIN

s<= '0';

END data_flow;

I've also tried null instead of 0. But it still doesn't work. is it because I don't have IN std_logic

thank you in advance

altera_forum · Answer

Did you assign s port to the correct device pin?

altera_forum · Answer

thank you for ur replying. Yes I did and i'm sure about that

altera_forum · Answer

--- Quote Start ---

Because my circuit is like this:

output pin(3.3V ) LED power supplied(3.3V)

so If I want to light up my LED, I should have an output pin=0V. I've try some VHDL code, it seems it doesn't work

--- Quote End ---

What is the value of your current limiting resistor? Did you put a scope or a meter to measure the output pin?

Kevin Jennings

altera_forum · Answer

--- Quote Start ---

I've also tried null instead of 0.

--- Quote End ---

Null would be incorrect, '0' is correct.

--- Quote Start ---

But it still doesn't work. is it because I don't have IN std_logic

--- Quote End ---

No

Kevin Jennings

altera_forum · Answer

The pins can source and drain the required current? I would reccommend using a ground pin. I think there must be a couple of those.

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