求助---关于CPLD采集图象信号时序的问题

只看该作者 · 2007-4-10 15:12

用CPLD采集图象时序
采用VHDL语言
（第一次VHDL写程）
程序如下：
LIBRARY IEEE;
USE IEEE.Std_Logic_1164.ALL;
USE IEEE.Std_Logic_Arith.ALL;
USE IEEE.Std_Logic_Unsigned.ALL;

entity SAA7111A is
  port (
-------SAA7111A_interface------------------------
        LLC2 : in std_logic;
        HREF : in std_logic;
        VREF : in std_logic;
        HS   : in std_logic;
        VS   : in std_logic;
        RTS0 : in std_logic;
        VPO  : in std_logic_vector(15 downto 0);
        TAKE : in std_logic;
-------------------------------------------------
-------SRAM_interface----------------------------
        addr : out std_logic_vector(18 downto 0);
        data : out std_logic_vector(15 downto 0);
        nCE  : out std_logic;
        nWE  : out std_logic;
        nOE  : out std_logic;
        nUB  : out std_logic;
        nLB  : out std_logic;
-------------------------------------------------
-------interrupt_line----------------------------
        line : out std_logic
-------------------------------------------------
    );
end SAA7111A;

ARCHITECTURE SAA7111A_ac OF SAA7111A IS

  SIGNAL TempAddr : STD_LOGIC_VECTOR(18 DOWNTO 0);
  SIGNAL couter : INTEGER range 0 TO 576;

BEGIN
     couter <= 0;
     TempAddr <= "0000000000000000000";
     addr <= "0000000000000000000";
A:    PROCESS(LLC2)      -------------sample,VREF

    variable YUV422 : STD_LOGIC_VECTOR(15 DOWNTO 0);

    BEGIN


          IF LLC2'event AND LLC2='1' THEN
            YUV422 := VPO;
           IF VREF='1' AND HREF='1' AND TAKE='1' THEN

                data <= YUV422;
                addr <= TempAddr+1;

                nCE <= '0';
                nWE <= '0';
                nOE <= '0';
                nUB <= '0';
                   nLB <= '1';
            ELSE
                nCE <= '1';
                nWE <= '1';
                nOE <= '1';
                nUB <= '1';
                nLB <= '1';
                data <= "0000000000000000";

           END IF;
         END IF;
    END PROCESS;

B:PROCESS(VREF)
        BEGIN
           IF VREF'event AND VREF='0' THEN
               IF RTS0='1' THEN
                  TempAddr <= "0000000000000000000" ;
                  line <= '1'    ;
               END IF;
            END IF;
END PROCESS;

END SAA7111A_ac;

编译的时候出现
Error:Line 35   signal"TempAddr"has multiple sources
Error:Line 19   signal"addr"has multiple sources

望高手指点啊