用EDA编写模200计数器的程序

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<p>用EDA编写模200计数器的程序</p>
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<p>解决时间：2010-5-21 12:30</p>
<p>提问者： 0canghaiyisu0 - 一级</p>
<p>最佳答案</p>
<p>library  ieee;</p>
<p>use ieee.std_logic_1164.all;</p>
<p>entity counter is</p>
<p>port (clk，reset: in std_logic;</p>
<p>digit1，digit2，digit3:out std_logic_vector(6 downto 0) );</p>
<p>end counter;</p>
<p>architecture counter of counter is</p>
<p>begin</p>
<p>process (clk， reset)</p>
<p>variable temp1: integer range 0 to 10;</p>
<p>variable temp2: integer range 0 to 10;</p>
<p>variable temp1: integer range 0 to 2;</p>
<p>begin</p>
<p>if(reset=\'1\')then</p>
<p>temp1:=0;</p>
<p>temp2:=0;</p>
<p>temp3:=0;</p>
<p>elsif (clk\'event and clk=\'1\')then</p>
<p>temp1:=temp1+1;</p>
<p>if (temp1=10)then</p>
<p>temp1:=0;</p>
<p>temp2:=temp2+1;</p>
<p>if (temp2=10) then</p>
<p>temp3:=temp3+1;</p>
<p>if (temp3=2) then</p>
<p>temp3:=0</p>
<p>end if;</p>
<p>end if;</p>
<p>end if;</p>
<p>end if;</p>
<p>case temp1 is</p>
<p>when 0 => digit1<="1111110";</p>
<p>when 1 => digit1<="0110000";</p>
<p>when 2 => digit1<="1101101";</p>
<p>when 3 => digit1<="1111001";</p>
<p>when 4 => digit1<="0110011";</p>
<p>when 5 => digit1<="1011011";</p>
<p>when 6 => digit1<="1011111";</p>
<p>when 7 => digit1<="1110000";</p>
<p>when 8 => digit1<="1111111";</p>
<p>when 9 => digit1<="1111011";</p>
<p>when others=>null;</p>
<p>end case;</p>
<p>case temp2 is</p>
<p>when 0 => digit2<="1111110";</p>
<p>when 1 => digit2<="0110000";</p>
<p>when 2 => digit2<="1101101";</p>
<p>when 3 => digit2<="1111001";</p>
<p>when 4 => digit2<="0110011";</p>
<p>when 5 => digit2<="1011011";</p>
<p>when 6 => digit2<="1011111";</p>
<p>when 7 => digit2<="1110000";</p>
<p>when 8 => digit2<="1111111";</p>
<p>when 9 => digit2<="1111011";</p>
<p>when others=>null;</p>
<p>end case;</p>
<p>case temp3 is</p>
<p>when 0 => digit3<="1111110";</p>
<p>when 1 => digit3<="0110000";</p>
<p>when others=>null;</p>
<p>end case;</p>
<p>end process;</p>
<p>end counter;</p>
<p>1</p>
<p>回答者：</p>
<p>0夏至将至0 - 三级   2010-5-21 12:30</p>
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