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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