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这是非常好的vhdl例子

NET "sysclk"  LOC = "P80";

NET "tonekey1<0>" LOC = "P37";
NET "tonekey1<1>" LOC = "P39";
NET "tonekey1<2>" LOC = "P40";
NET "tonekey1<3>" LOC = "P42";
NET "tonekey1<4>" LOC = "P43";

NET "musickey1"   LOC = "P45";

NET "spkout0" LOC = "P3";
NET "spkout1" LOC = "P4";