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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 09:30:10 2004 
COMP "ps2data" LOCATE =  SITE "P5" LEVEL 1; 
COMP "sysclk" LOCATE =  SITE "P80" LEVEL 1; 
COMP "vsyncb" LOCATE =  SITE "P35" LEVEL 1; 
COMP "rgb<0>" LOCATE =  SITE "P33" LEVEL 1; 
COMP "rgb<1>" LOCATE =  SITE "P34" LEVEL 1; 
COMP "rgb<2>" LOCATE =  SITE "P29" LEVEL 1; 
COMP "ps2clk" LOCATE =  SITE "P7" LEVEL 1; 
COMP "model1<0>" LOCATE =  SITE "P37" LEVEL 1; 
COMP "model1<1>" LOCATE =  SITE "P39" LEVEL 1; 
COMP "model1<2>" LOCATE =  SITE "P40" LEVEL 1; 
COMP "reset1" LOCATE =  SITE "P45" LEVEL 1; 
COMP "hsyncb" LOCATE =  SITE "P36" LEVEL 1; 
NET "sysclk_BUFGP/IBUFG" BEL "sysclk_BUFGP/BUFG.GCLKMUX" USELOCALCONNECT ;
SCHEMATIC END ;