AR_EncryptKeyIdx
ads->ds_ctl1 = (keyIx << AR_EncryptKeyIdx_S) & AR_EncryptKeyIdx;
(keyIx << AR_EncryptKeyIdx_S) & AR_EncryptKeyIdx;
MS(txc.ds_ctl1, AR_EncryptKeyIdx),
MS(txc.ds_ctl1, AR_EncryptKeyIdx),