AR_DestIdx
ads->ds_ctl1 |= SM(keyIx, AR_DestIdx);
ads->ds_ctl1 |= SM(keyIx, AR_DestIdx);
ads->ds_ctl1 |= SM(keyIx, AR_DestIdx);
MS(txc.ds_ctl1, AR_DestIdx),
MS(txc.ds_ctl1, AR_DestIdx),
MS(txc.ds_ctl1, AR_DestIdx),