Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Altera_Forum
Honored Contributor I
1,564 Views

QUARTUS II: Error: formal "b" does not exist

library IEEE; 

use IEEE.STD_LOGIC_1164.ALL; 

use IEEE.STD_LOGIC_ARITH.ALL; 

use IEEE.STD_LOGIC_UNSIGNED.ALL; 

 

 

library work; 

use work.all;  

 

 

 

 

---- Uncomment the following library declaration if instantiating 

---- any Xilinx primitives in this code. 

--library UNISIM; 

--use UNISIM.VComponents.all; 

 

 

entity mult32bit is 

generic ( 

DATA_WIDTH : integer := 32 

); 

port( 

a : in std_logic_vector(DATA_WIDTH-1 downto 0); 

--PARAM 

d : in std_logic_vector(7 downto 0); 

--PARAM 

c : out std_logic_vector((2*DATA_WIDTH)-1 downto 0) 

); 

end mult32bit; 

 

 

architecture Behavioral of mult32bit is 

 

signal b : std_logic_vector(31 downto 0); 

signal e : std_logic_vector(23 downto 0); 

signal right : std_logic_vector((DATA_WIDTH)-1 downto 0); 

signal left : std_logic_vector((DATA_WIDTH)-1 downto 0); 

signal left_shifted : std_logic_vector((2*DATA_WIDTH)-1 downto 0); 

signal new_right : std_logic_vector((2*DATA_WIDTH)-1 downto 0); 

begin 

b <= e & d; 

MULTIPLIER_right:entity work.mult16bit 

port map( 

 

 

a => a(15 downto 0), 

b => b(15 downto 0), here is error line 42 

c => right 

); 

 

 

MULTIPLIER_left:entity work.mult16bit 

port map( 

 

 

a => a(31 downto 16), 

b => b(31 downto 16), 

c => left 

);  

 

left_shifted <= left & "00000000000000000000000000000000" ; 

-- left_shifted <= std_logic_vector("sll"(unsigned(left), 8)); 

 

new_right <= "00000000000000000000000000000000" & right; 

 

 

c <= unsigned(new_right) + unsigned(left_shifted) ; 

 

 

 

end Behavioral; 

 

 

it is 32*32 multiplier 

 

 

Error: formal "b" does not exist mult32bit.vhd line 42 

can anyone help me in this
0 Kudos
2 Replies
Altera_Forum
Honored Contributor I
267 Views

Where do you define e? You can't have b unless you have e defined somewhere with a value.

Altera_Forum
Honored Contributor I
267 Views

This is a duplicate of this thread: 

https://alteraforum.com/forum/showthread.php?t=56776 

 

Im locking this one.
Reply