URE_PLA_EXTRA_STATUS
URE_CLRBIT_2(sc, URE_PLA_EXTRA_STATUS, URE_MCU_TYPE_USB, URE_LINK_CHANGE_FLAG);
val = ure_read_2(sc, URE_PLA_EXTRA_STATUS, URE_MCU_TYPE_PLA);
ure_write_2(sc, URE_PLA_EXTRA_STATUS, URE_MCU_TYPE_PLA, val);