CODEWITHSUNDEEP
vhdl
Sofronis Lymbouras
Sofronis Lymbouras

Reputation: 1

multiplexer 8x1 in VHDL

i try to do in EDA playground platform a code for 8x1 multiplexer put something is going wrong. The show me an error that i search it and i found that is from verilog language and i don't understand why? i check again and again my code and i dont find any mistake. please see the code from the link below to run it and help me to solve is problem and i understand why is apear me that error

https://www.edaplayground.com/x/2T3x

Upvotes: 0

Views: 4507

Answers (2)

Sofronis Lymbouras
Sofronis Lymbouras

Reputation: 1

Thanks for the help. My code is now working 

-- Code your design here
library IEEE;
use IEEE.std_logic_1164.all;

--declaration for 8x1
entity mux8x1 is   
    port( I : in std_logic_vector(7 downto 0); -- input that need 8x1
           s: in std_logic_vector(2 downto 0); --is the enable
           Y: out std_logic -- output of 8x1 is the output
    );
end mux8x1;

architecture behavioral of mux8x1 is
    signal f0,f1,f2,f3 : std_logic;
begin
    process(I,S)
    begin
        if s(0)='0' then 
            f0<=I(7);
            f1<=I(5);
            f2<=I(3);
            f3<=I(1);
        else 
            f0<=I(6);
            f1<=I(4);
            f2<=I(2);
            f3<=I(0);
        end if;

        if (s(1)='0' and s(0)='0')then
            Y<=f0;
            if (s(1)='0' and s(0)='1')then
                Y<=f1;
                if (s(1)='1' and s(0)='0')then
                    Y<=f2;
                    if (s(1)='1' and s(0)='1')then
                        Y<=f3;
                    end if;
                end if;
            end if;
        end if;
    end process;
end behavioral;

Upvotes: 0

pm101
pm101

Reputation: 1424

you need to rename your testbench to something different to your module.

Call it 'multiplexer_test' instead.

i.e. the following lines

testbench.vhd

ENTITY multiplexer IS
END multiplexer;

ARCHITECTURE behavior OF multiplexer IS

to

ENTITY multiplexer_test IS
END multiplexer_test;

ARCHITECTURE behavior OF multiplexer_test IS

And also you need to change the top entity to multiplexer_test instead of testbench

i.e.

top module

Or if you just rename the testbench module from multiplexer to testbench then you don't need to do the second step

Upvotes: 1

Related Questions