课上老师讲的, 真值表方式:

SUBDESIGN 7seg
(
    i[3..0]             : INPUT;
    a, b, c, d, e, f, g : OUTPUT;
)

BEGIN

    TABLE
        i[3..0] => a, b, c, d, e, f, g;
             0  => 0, 0, 0, 0, 0, 0, 1;
             1  => 1, 0, 0, 1, 1, 1, 1;
             2  => 0, 0, 1, 0, 0, 1, 0;
             3  => 0, 0, 0, 0, 1, 1, 0;
             4  => 1, 0, 0, 1, 1, 0, 0;
             5  => 0, 1, 0, 0, 1, 0, 0;
             6  => 0, 1, 0, 0, 0, 0, 0;
             7  => 0, 0, 0, 1, 1, 1, 1;
             8  => 0, 0, 0, 0, 0, 0, 0;
             9  => 0, 0, 0, 0, 1, 0, 0;
    END TABLE;

END;

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