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LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY zdz IS
  PORT(CLK1:IN STD_LOGIC;      --加1单脉冲
              CLK2:IN STD_LOGIC;      --减1单脉冲
                RST:IN STD_LOGIC;
                  DA :OUT STD_LOGIC;   --LED指示信号     
              DATA:OUT STD_LOGIC_VECTOR(7 DOWNTO 0));
END zdz;
ARCHITECTURE behav OF zdz IS
  SIGNAL D_IN : STD_LOGIC_VECTOR(7 DOWNTO 0);
  SIGNAL D_OUT: STD_LOGIC_VECTOR(7 DOWNTO 0);
BEGIN
P1:PROCESS(CLK1,RST)                       
   BEGIN
        IF RST='1' THEN D_OUT<="10001000";
        ELSIF CLK1'EVENT AND CLK1='1' THEN
              D_OUT<=D_OUT+1;
        END IF;       
END PROCESS P1;
P2:PROCESS(CLK2,RST)                       
   BEGIN
        IF RST='1' THEN D_OUT<="10001000";
        ELSIF CLK2'EVENT AND CLK2='1' THEN
              D_OUT<=D_OUT-1;
        END IF;       
END PROCESS P2;
-----------------------------------------
   DATA<=D_OUT;
   D_IN<="10101010";
P3:PROCESS(D_OUT)                       
   BEGIN
        IF D_OUT > D_IN THEN DA<='1';
        ELSE DA<='0';
        END IF;        
END PROCESS P3; 
END behav;

上面的就是那个程序，还请帮忙给修改一下。谢谢了！

还没能给修改一下吗......谢谢了......
我的意思是想：按键1控制数值加1...，比如加到8后，再按键2则数值减1，且是从8开始减的...，再比如减到了2后，再按键1则数值又加1，且是从2开始加的...
就是想让它能记住修改后的这个值，以便下次修改时还能从这个数开始修改