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&引用；“意外他人”；用vhdl语言

vhdl

&引用；“意外他人”；用vhdl语言,vhdl,xilinx,hdl,Vhdl,Xilinx,Hdl,所以我对一个vhdl错误有一个问题，它说：意外的另一个 led <= "0000001" when count = "0000" else "1001111" when count = "0001" else "0010010" when count = "0010" else "0110000" when count = "0011" else "1001101" when count = "0100" else

所以我对一个vhdl错误有一个问题，它说：意外的另一个

led <= "0000001" when count = "0000" else
        "1001111" when count = "0001" else
        "0010010" when count = "0010" else
        "0110000" when count = "0011" else
        "1001101" when count = "0100" else
        "0100101" when count = "0101" else
        "0100000" when count = "0110" else
        "0001111" when count = "0111" else
        "1111111" when count = "1000" else
        "0000100" when count = "1001" else
         "1111110" when others ;

led您不需要编写
其他
。这样做：


led <= "0000001" when count = "0000" else
    "1001111" when count = "0001" else
    "0010010" when count = "0010" else
    "0110000" when count = "0011" else
    "1001101" when count = "0100" else
    "0100101" when count = "0101" else
    "0100000" when count = "0110" else
    "0001111" when count = "0111" else
    "1111111" when count = "1000" else
    "0000100" when count = "1001" else
     "1111110" ;



led更标准的方法是


with count select 
led <=  "0000001" when "0000",
        "1001111" when "0001",
        "0010010" when "0010",
        "0110000" when "0011",
        "1001101" when "0100",
        "0100101" when "0101",
        "0100000" when "0110",
        "0001111" when "0111",
        "1111111" when "1000",
        "0000100" when "1001",
        "1111110" when others;



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