標題: 求助：程序出錯！ [打印本頁] 作者: zhangjin1986 時間: 2012-9-14 11:17 標題: 求助：程序出錯！ 各位大俠，我編了個程序，按鍵按一下，輸入信號放大一倍，再按，再放大，一直到64倍。按另外一個按鍵，輸出信號變零。
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
use IEEE.std_logic_unsigned.all;
Entity bp is
port(xh:in bit;
s1:in std_logic;
s2:in std_logic;
scut bit_vector(6 downto 0));
End bp;
Architecture bianping of bp is
Signal cnt:integer range 0 to 5;
Signal data: integer range 0 to 5;
begin
yi:process(xh,s1)
begin
if(s1'event and s1='0') then
if(cnt=5) then cnt<=0;
else cnt<=cnt+1;
end if;
end if;
end process;
er:process(cnt)
begin
case cnt is
when 1=>sc(1 downto 0)<=xh&'0';data<=1;
when 2=>sc(2 downto 0)<=xh&'0'&'0';data<=2;
when 3=>sc(3 downto 0)<=xh&'0'&'0'&'0';data<=3;
when 4=>sc(4 downto 0)<=xh&'0'&'0'&'0'&'0';data<=4;
when 0=>sc(6 downto 0)<=xh&'0'&'0'&'0'&'0'&'0'&'0';data<=0;
when others=>NULL;
end case;
end process;
san:process(s2,data)
begin
if(s2'event and s2='0') then
case data is
when 1=>sc(1 downto 0)<="00";
when 2=>sc(2 downto 0)<="000";
when 3=>sc(3 downto 0)<="0000";
when 4=>sc(4 downto 0)<="00000";
when 0=>sc(6 downto 0)<="0000000";
when others=>NULL;
end case;
end if;
end process;
end bianping;
編譯，出錯。
Errorine 9:File f:\bb\bp.vhd:Unsupported feature error:unresolved signal is multiply driven(第九行為紅色的)
請各位大俠指點，謝謝！ 作者: asyou 時間: 2012-9-14 16:18
看看語法嘛，你一個輸出連了多少個Process啊！你要用中間變量替換，再做選擇，或是在一個Process里做選擇！作者: ty1932 時間: 2012-9-29 21:07
= =
ut bit_vector(6 downto 0));
ine 9:File f:\bb\bp.vhd:Unsupported feature error:unresolved signal is multiply driven(第九行為紅色的)