AR_INTR_SYNC_CAUSE
sync_cause = REG_READ(ah, AR_INTR_SYNC_CAUSE(ah)) &
sync_cause = REG_READ(ah, AR_INTR_SYNC_CAUSE(ah)) & AR_INTR_SYNC_DEFAULT;
tmpReg = REG_READ(ah, AR_INTR_SYNC_CAUSE(ah));
REG_WRITE(ah, AR_INTR_SYNC_CAUSE(ah), 0xFFFFFFFF);
host_isr = REG_READ(ah, AR_INTR_SYNC_CAUSE(ah));