VHDL signal值不能传输？？

只看该作者 · 2013-3-13 10:41

本帖最后由 entepino 于 2013-3-13 10:47 编辑

--异步脉冲进行内同步process
SynPulse:process

  begin
      WAIT UNTIL CLK200k ='1';
                  SynPulseIN <= PulseIN;

  end process SynPulse;

--接受SDK发送数据process。
RecData: Process

begin

      TagRecData(3 downto 0) <=  axi_gpio_0_GPIO_IO_O_pin(27 downto 24);

               if(TagRecData = "0001" ) then
                  FixData1(9 downto 0) <=  axi_gpio_0_GPIO_IO_O_pin(9 downto 0);
                  LED1 <= '0';
                     LED2 <= '1';
                  LED3 <= '1';
               elsif (TagRecData = "0010" ) then
                     FixData2(9 downto 0) <=  axi_gpio_0_GPIO_IO_O_pin(9 downto 0);
                     LED1 <= '0';
                     LED2 <= '0';
                     LED3 <= '1';
               elsif (TagRecData = "0011" ) then
                     FixData3(9 downto 0) <=  axi_gpio_0_GPIO_IO_O_pin(9 downto 0);
                     LED1 <= '1';
                  LED2 <= '0';
                  LED3 <= '1';
                     else
                     null;
               end if;


  end process RecData;
--

--计数并置电平process
  INPulseCNT:process
  begin
      if (SynPulseIN'EVENT AND SynPulseIN = '1') then
                              CntINPulse<=CntINPulse+"0000000001";

            if (CntINPulse>"0000000001"  and CntINPulse<FixData1) then
                        EnPulseIN  <= '1';
                        EnPulseOut <= '0';
                        EnTrig := '0';
         elsif (CntINPulse>FixData1+"0000001011" and CntINPulse<FixData1+"0000001011"+"0000001001")
            then
                     EnPulseIN <= '0';
                     EnPulseOut <= '1';
                     EnTrig := '1';
         elsif  CntINPulse = FixData1+"0000001011"+"0000001001"  then
                        EnPulseIN <= '0';
                        EnPulseOut <= '0';
                        EnTrig := '0';
                        CntINPulse <= "0000000000";
            else
                        null;
            end if;

            end if;

end process INPulseCNT;

指示灯亮了，说明数据已经接受到了，但就是置电平的process操作不对，如果把FixData1换成常数"0000001011"，就一切电平就正常了，请问为何数据接受到了，在process中操作就不对啊？是不是前面的(SynPulseIN'EVENT AND SynPulseIN = '1触发条件有关系？也就是说在触发的那个时刻，FixData1这个信号没有保持住？