D_DTS_PRVOUT
| D_DTS_PRVIN(16) | D_PIPE(16) | D_DTS_PRVOUT(16);
val = D_DTS_VO | D_DTS_INS | D_DTS_PRVOUT(prevpipe) | pipe;
val = D_DTS_VO | D_DTS_DEL | D_DTS_PRVOUT(prevpipe) | pipe;