AR_INTR_SYNC_CAUSE
val = MS(OS_REG_READ(ah, AR_INTR_SYNC_CAUSE),
OS_REG_RMW_FIELD(ah, AR_INTR_SYNC_CAUSE,
isr = OS_REG_READ(ah, AR_INTR_SYNC_CAUSE);
o_sync_cause = sync_cause = OS_REG_READ(ah, AR_INTR_SYNC_CAUSE);
tmpReg = OS_REG_READ(ah, AR_INTR_SYNC_CAUSE);
OS_REG_WRITE(ah, AR_INTR_SYNC_CAUSE, 0xFFFFFFFF);