WHAT IS THE PROBLEM I tried to make 4 bit full adder vhdl co

WHAT IS THE PROBLEM?

I tried to make 4 bit full adder vhdl code(quartus2)

why this happens and how can I solve this?

File Edit View Project Assignments Processing Tools Window Help Dua d @ r |fourbitadd x Flow: Compilation TOP fourbitadd.vhd Compilation Report - Flow Summary Librar Use ieee.std logic 1164.all: y ieee; 2 4 Entity fourbitadd is 5 port (a, b: in std logic vector 3 downto 0) c in: in std logic: s: out std logic vector (3 downto 0) c out: out std logic) 7 end fourbitadd; 10 11 Architecture ga of fourbitadd is 12 % | component full-adder port (a, , cin: in std logic: s, cout out stdlogic); 13 | 15 end component; signal carry: std logic vector (2 downto 0) begin 17 18 19 20 21 stageO : ful ladd port map (a=>a (0), b=>b(0), cin=>c in, 3=>3 (0), c out=>carry (0)); stage 1: ful ladd port map (a=>a (1), b=>b(1), c in=>carry (0), 3=>3(1), c out=>carry (1)); stage2 : fulladd port map (a=>a (2), b=>b (2), cin=>carry (1), 33(2), coutcarry (2 )); stage3 : ful ladd port map (a=>a (3), b=>b (3), c incarry (2), 33(3), cout=>c out); - 267 268 end ga: XType Message ,V Info: Running Quartus II Analysis & Synthesis Info: Info: Found 2 design units, including 1 entities, in source file fourbitadd.vhd Error (10482) VHDL error at fourbitadd.vhd (18) : object \"fulladd\" is used but not declared Error: Quartus II Analysis & Synthesis was unsuccessful. 1 error, 0 warnings Command : quartus-map -read-settings-files-on -write-settings-files-off fourbitadd -c fourbitadd

Solution

library IEEE;

use Ieee.std_logic_1164.all;

entity adder_4bit is

port(

a:inn std_logic_vector(3 downto 0):

b:in std_logic_vector(3 downto o):

carry:out std_logic;   

sum:out std_logic_vector(3 downto 0)

);

end adder_4bit;

architecture adder_4bit_arc of addder_4bit is

component fa is

port(a:in std_logic;

b:in std_logic;

c:in std_logic;

sum:out std_logic;

carry:out std_logic;

);

end component;

sgnal sstd_logic_vector(2 downto o);

begin

uo:fa port map(a(0),b(0),\'0\',sum(o),s(0));

u1:fa port map(a(1),b(1),s(0),sum(1),s(1));

u2:fa port map(a(2),b(2),s(1),sum(2),s(2));

ue:fa port map(a(3),b(3),s(2),sum(3),carry);

end adder_4 bit_arc;

the above is the correct program in VHDL

the mistakes in ur program as mentioned in component 18 is \"fulladd\"

as in component 12 you mentioned it as :fulladder:

so in a program u nedd to use only one keyword

it will not take different keywords