block SysArch DB db_c; S1 s1_c; S2 s2_c; connect(db_c.input[1], s2_c.output[1]); connect(db_c.output[1], s2_c.input[1]); connect(s1_c.input[2], s2_c.output[2]); connect(s1_c.output[2], s2_c.input[2]); end SysArch