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Altera_Forum
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15 years ago

Silly error in 8 by 8 Bit Multiplier !!

Hi Actually I have wrote a code for 8 by 8 Bit Multiplier that uses CARRY LOOK AHEAD ADDER for the addition But The program gives me RIGHT results for some numbers and WRONG results for o...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

for an 8 bit adder, try this code instead: 


library ieee;
use ieee.numeric_std.all;
entity adder is
  port (
    A : in unsigned(7 downto 0);
    D : in unsigned(7 downto 0);
    result : out unsigned(8 downto 0)
  );
architecture rtl of adder is
begin
  result <= ('0' & A) + ('0' & D);
end rtl;