calculator disign using key encoder

Code VHDL - [expand]
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-- hds header_start
--
-- VHDL Architecture calculator.counter.untitled
--
-- Created:
--          by - Asmaa.UNKNOWN (IDEA-PC)
--          at - 09:47:55 10/04/2015
--
-- Generated by Mentor Graphics' HDL Designer(TM) 2001.5 (Build 170)
--
-- hds header_end
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
 
 
ENTITY counter IS
-- Declarations
          port(clk,rst,en:in std_logic;
    count:out std_logic_vector(3 downto 0));
 
END counter ;
 
-- hds interface_end
ARCHITECTURE untitled OF counter IS
         signal count_temp:unsigned(3 downto 0);
BEGIN
process(clk,rst)
  begin
    if(rst='1')then
    count_temp<=(others=>'0');
    elsif(rising_edge(clk))then
      if(en='1')then
        count_temp<=count_temp+1;
        end if;
        end if;
        end process;
        count<=std_logic_vector(count_temp);
END untitled;
MUL4_1:
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
 
 
ENTITY Mul4_1 IS
-- Declarations
    port(a:in std_logic_vector(3 downto 0);
        sel :in std_logic_vector(1 downto 0);
           y: out std_logic);
 
 
END Mul4_1 ;
 
 
 
 
 
 
Dec2_4:
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
 
 
ENTITY dec2_4 IS
-- Declarations
 port(a:in std_logic_vector(1 downto 0);
    y:out std_logic_vector(3 downto 0));
 
END dec2_4 ;
 
-- hds interface_end
ARCHITECTURE untitled OF dec2_4 IS
BEGIN
  process(a)
  begin
    if(a="00")then y<="0001";
    elsif(a="01")then y<="0010";
      elsif(a="10")then y<="0100";
      else y<="1000";
      end if;
      end process;
END untitled;

Code VHDL - [expand]
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-- hds header_start
--
-- VHDL Architecture calculator.nodpad.untitled
--
-- Created:
--          by - Asmaa.UNKNOWN (IDEA-PC)
--          at - 09:58:08 10/04/2015
--
-- Generated by Mentor Graphics' HDL Designer(TM) 2001.5 (Build 170)
--
-- hds header_end
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
 
 
ENTITY nodpad IS
-- Declarations
port(Key_pressed: in std_logic_vector(4 downto 0);
    rows:in std_logic_vector(3 downto 0);
    cols:out std_logic_vector(3 downto 0));
 
END nodpad ;
 
-- hds interface_end
ARCHITECTURE untitled OF nodpad IS
BEGIN
 process(rows,Key_pressed)
  variable cols_var:std_logic_vector(3 downto 0);
  begin
    cols_var:="0000";
    if(key_pressed(4)='1')then
      cols_var(conv_integer(unsigned(Key_pressed(1 downto 0)))):=
      rows(conv_integer(unsigned(Key_pressed(3 downto 2))));
    else
      cols_var:="0000";
      end if;
      cols<=cols_var;
      end process;
END untitle