ENTITY fsm IS
    PORT(x,y,clk:IN BIT;z:OUT BIT);
END fsm;
ARCHITECTURE su OF fsm IS
    COMPONENT logical_part
        PORT(in0,in1,q0,q1:IN BIT;d0,d1:OUT BIT);
    END COMPONENT;
    COMPONENT memory_part
        PORT(d_in0,d_in1,clk:IN BIT;d_out0,d_out1:OUT BIT);
    END COMPONENT;
    SIGNAL IS1,IS2,IS3,IS4:BIT;
BEGIN
    c1:logical_part PORT MAP(x,y,IS2,IS3,IS4,z);
    c2:memory_part PORT MAP(IS3,IS4,clk,IS1,IS2);
END su;
ENTITY logical_part IS
    PORT(in0,in1,q0,q1:IN BIT;d0,d1:OUT BIT);
END logical_part;
ARCHITECTURE dataflow OF logical_part IS
BEGIN
    d0<=(in0 AND q0)OR(x AND q1);
    d1<=(NOT q0)AND(NOT q1)AND in_0;
    out1<=(NOT in_0)AND(NOT in_1)AND q0;
END dataflow;
ENTITY memory_part IS
        PORT(d_in0,d_in1,clk:IN BIT;d_out0,d_out1:OUT BIT);
END memory_part;
ARCHITECTURE dataflow OF memory_part IS
BEGIN
    BLOCK(clk='1' AND clk'event)
    BEGIN
        d_out0<=GUARDED d_in0;
        d_out1<=GUARDED d_in1;
    END BLOCK
END dataflow;

请问这个程序应该写在一个文件还是3个文件，无论我写在一个文件还是3个文件都有很多错误请各位指点