# RM Mode Concept:
-MVRM-2P-2S1D:
+MVRM-2P-1S1D:
| Field Name | Field bits | Description |
|------------|------------|----------------------------|
| Rdest_EXTRA2 | `10:11` | extends Rdest (R\*\_EXTRA2 Encoding) |
| Rsrc_EXTRA2 | `12:13` | extends Rsrc (R\*\_EXTRA2 Encoding) |
-| src_SUBVL | `14:15` | SUBVL for Source |
+| PACK_en | `14` | Enable pack |
+| UNPACK_en | `15` | Enable unpack |
| MASK_SRC | `16:18` | Execution Mask for Source |
The inclusion of a separate src SUBVL allows