esTc 设计中 ENTITY top心stop.HD END top ARCHITECTURE struc OF top Is COMPONENT middle GENER(n: POSITIVE万 PORT(input: IN BIT; output OUT BIT END COMPONENT. SIGNAL S1S2. BIT 标点符号 BEGIN U1: middle GENERIC MAP(n=>9) PORT MAP (input=>s1, output=>s2) END struc设计中心 ENTITY top IS END top; ARCHITECTURE struc OF top IS COMPONENT middle GENERIC ( n : POSITIVE ); PORT(input : IN BIT; output : OUT BIT ); END COMPONENT; SIGNAL s1,s2 : BIT ; BEGIN U1: middle GENERIC MAP (n=>9) PORT MAP (input=>s1, output=>s2); END struc; top.VHD 标点符号