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jlhl1170 · 發表於 2008-1-12 10:50:38

20位元BIN轉BCD的程式
LIBRARY IEEE;
use IEEE.std_logic_1164.all;

entity bin2bcd is
port(
  data_in : in std_logic_vector(19 downto 0);
  EN : in std_logic;
  data_out : out std_logic_vector(23 downto 0)
);
end entity;

architecture bin2bcd of bin2bcd is
begin

process(data_in, EN)
variable data_in_TEMP : std_logic_vector(2 downto 0);
begin
  data_in_TEMP := data_in(19 downto 1);
  data_out  '0');
  if EN='1' then
case data_in_TEMP is
when "000" => data_out(23 downto 1)  data_out(23 downto 1)  data_out(23 downto 1)  data_out(23 downto 1)  data_out(23 downto 1)  data_out(23 downto 1)  data_out(23 downto 1)  data_out(23 downto 1)  data_out'0');
end case;

data_out(0) <= data_in(0);
  end if;
end process;

end architecture;

CHECK的時候第一行跟if EN='1' then這行出現錯誤
會是什麼問題??

johson · 發表於 2008-1-22 17:03:26

variable data_in_TEMP : std_logic_vector(2 downto 0); ~~資料寬度 3 bits
data_in_TEMP := data_in(19 downto 1);~~資料寬度 19 bits ??
data_out '0');~~????????目的為何????

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