AR_TIME_OUT
REG_WRITE(ah, AR_TIME_OUT, 0x00000400);
REG_WRITE(ah, AR_TIME_OUT, 0x00000400);
REG_RMW_FIELD(ah, AR_TIME_OUT, AR_TIME_OUT_ACK, val);
REG_RMW_FIELD(ah, AR_TIME_OUT, AR_TIME_OUT_CTS, val);