请利用原件例化语句,完成顶层文件对底层文件的调用。已知顶层文件的设计原理图如图2所示,u1、u2为被调用的底层原件。 题29图.docx ENTITY t1 IS PORT (a1 ,a2,ca3 : ___________ STD_LOGIC; out1 ,out2: ___________ STD_LOGIC ); END ENTITY t1; ARCHITECTURE f1 OF t1 IS COMPONENT ________________ PORT ( a, b: IN STD_LOGIC; co,so: OUT STD_LOGIC); END COMPONENT ; COMPONENT ______________ PORT ( a, b, c : IN STD_LOGIC; C0, C1 : OUT STD_LOGIC); END COMPONENT ; SIGNAL net1, net2 : STD_LOGIC; BEGIN _____________________________________________________ _____________________________________________________ END ARCHITECTURE fd1;