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<br />LIBRARY IEEE;<br />USE IEEE.STD_LOGIC_1164.ALL;<br /><br />ENTITY encoder8_3_B IS<br /> PORT(<br /> COIN:IN STD_LOGIC_VECTOR(7 DOWNTO 0);<br /> SI_5:IN STD_LOGIC;<br /> EN,RESET:IN STD_LOGIC;<br /> COIN_CODE:OUT STD_LOGIC_VECTOR(3 DOWNTO 0));<br />END encoder8_3_B;<br />ARCHITECTURE behavior OF encoder8_3_B IS<br /> SIGNAL ADDER:INTEGER RANGE 0 TO 1;<br />BEGIN<br /> PROCESS(EN,RESET,COIN,SI_5)<br /> BEGIN<br /> IF EN='1' THEN <br /> <br /><br /> IF RESET='1' THEN COIN_CODE<=X"0";ADDER<=0;<br /> ELSIF RISING_EDGE(SI_5) THEN ADDER<=ADDER+1;<br /> <br /><br /> IF(ADDER=0 AND SI_5='1') THEN COIN_CODE<=X"1";<br /> END IF;<br /> ELSE<br /> CASE COIN IS<br /> WHEN X"01"=> NULL;<br /> WHEN X"02"=> COIN_CODE<=X"1";<br /> WHEN X"04"=> COIN_CODE<=X"1";<br /> WHEN X"08"=> COIN_CODE<=X"2";<br /> WHEN X"10"=> COIN_CODE<=X"5";<br /> WHEN X"20"=> COIN_CODE<=X"A";<br /> WHEN OTHERS=> COIN_CODE<=X"0";<br /> END CASE;<br /> END IF;<br /> ELSE COIN_CODE<=X"0";ADDER<=0;<br /> END IF;<br /> END PROCESS;<br />END behavior;<br /><br />出错信息：<br />Error (10818): Can't infer register for "COIN_CODE[0]" at encoder8_3_B.vhd(17) because it does not hold its value outside the clock edge<br />Error (10818): Can't infer register for "COIN_CODE[1]" at encoder8_3_B.vhd(17) because it does not hold its value outside the clock edge<br />Error (10818): Can't infer register for "COIN_CODE[2]" at encoder8_3_B.vhd(17) because it does not hold its value outside the clock edge<br />Error (10818): Can't infer register for "COIN_CODE[3]" at encoder8_3_B.vhd(17) because it does not hold its value outside the clock edge<br />Error (10822): HDL error at encoder8_3_B.vhd(18): couldn't implement registers for assignments on this clock edge<br />Error: Can't elaborate top-level user hierarchy<br />Error: Quartus II Analysis & Synthesis was unsuccessful. 6 errors, 0 warnings<br /> Info: Allocated 152 megabytes of memory during processing<br /> Error: Processing ended: Mon Sep 08 16:56:26 2008<br /> Error: Elapsed time: 00:00:03<br />Error: Quartus II Full Compilation was unsuccessful. 6 errors, 0 warnings<br /> <br />中间空出的两行为显示出错的地方，请高手赐教啊！ |
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