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这是非常好的vhdl例子

SCHEMATIC START ;
// created by map version G.28 on Thu Dec 02 09:36:57 2004 
COMP "spkout0" LOCATE =  SITE "P3" LEVEL 1; 
COMP "spkout1" LOCATE =  SITE "P4" LEVEL 1; 
COMP "sysclk" LOCATE =  SITE "P80" LEVEL 1; 
COMP "musickey1" LOCATE =  SITE "P45" LEVEL 1; 
COMP "tonekey1<0>" LOCATE =  SITE "P37" LEVEL 1; 
COMP "tonekey1<1>" LOCATE =  SITE "P39" LEVEL 1; 
COMP "tonekey1<2>" LOCATE =  SITE "P40" LEVEL 1; 
COMP "tonekey1<3>" LOCATE =  SITE "P42" LEVEL 1; 
COMP "tonekey1<4>" LOCATE =  SITE "P43" LEVEL 1; 
NET "sysclk_BUFGP/IBUFG" BEL "sysclk_BUFGP/BUFG.GCLKMUX" USELOCALCONNECT ;
SCHEMATIC END ;