"unexpected others" in vhdl

StackOverflow https://stackoverflow.com/questions/17928105

  •  04-06-2022
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题

so I have a question to a vhdl error IT says: 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 ;
有帮助吗？

解决方案

You don't need to write others. Do it like this:

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" ;

其他提示

A more standard way to do this would be.

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;

And you have to use others. Because all the count values are not covered.

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