Re: HELP - Hardware register

Altera_Forum · ‎12-17-2017

Hello :)

I have created a register, but I am not able to make it work with every clock cycle.

It works good with the reset, but with the clock it automatically enters to the "others" option

Any hints?

library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
use IEEE.std_logic_unsigned.all;
entity registro_desp is 
PORT (entradax: in std_logic_vector (7 downto 0);
        salida: out std_logic_vector (14 downto 0);
        contador : in std_logic_vector (3 downto 0);
        clk: in std_logic;
        reset: in std_logic
);
end registro_desp;
architecture Behavioral of registro_desp is 
signal Q: std_logic_vector(14 downto 0);
begin 
reg_desp: process (clk, reset)
begin 
if (reset ='0' and clk = '1' and clk'event) then 
        CASE     contador is 
            when "0001" => Q <= ('0' & entradax & "000000");
            when "0010" => Q <= ('0' & entradax & "000000");
            
            when "0011" => Q <= ("00" & entradax & "00000");
            when "0100" => Q <= ("00" & entradax & "00000");
            
            when "0101" => Q <= ("000" & entradax & "0000");
            when "0110" => Q <= ("000" & entradax & "0000");
            
            when "0111" => Q <= ("0000" & entradax & "000");
            when "1000" => Q <= ("0000" & entradax & "000");
            
            when "1001" => Q <= ("00000" & entradax & "00");
            when "1010" => Q <= ("00000" & entradax & "00");
            
            when "1011" => Q <= ("000000" & entradax & "0");
            when "1100" => Q <= ("000000" & entradax & "0");
            
            when "1101" => Q <= ("0000000" & entradax);
            when "1110" => Q <= ("0000000" & entradax);
            
            when others => Q <= (entradax & "0000000");
            --wait until CLK'EVENT and CLK = '1';    --I THOUGHT THAT THIS WOULD WORK, BUT IT DIDN'T :(
        END CASE;
    elsif reset='1' then Q<="000000000000000";
            salida<=Q;
            
        end if;
    end process;
    end Behavioral;

Altera_Forum · ‎12-17-2017

Then I suspect that contador is anything other than the values in the case statement. Is it "0000", "1111" or "UUUU" or "XXXX" or "100X"?

Where is it not working? What controls contador?

Altera_Forum · ‎12-17-2017

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Then I suspect that contador is anything other than the values in the case statement. Is it "0000", "1111" or "UUUU" or "XXXX" or "100X"?

Where is it not working? What controls contador?

--- Quote End ---

ok, I realized with your comment that the problem was, in fact, with "contador". I already solved it and it works well.

Sorry for the inconvenience, and thank you a lot :)