vhdl - vhdl 中的 "unexpected others"

Question

所以我有一个 vhdl 错误的问题 IT 说:unexpected OTHER。

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 ;

Answer 1

你不需要写others。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" ;