Table 76

+========-==================================-===================+ 
|  Mode  |  Description                     |  Implementation   | 
|        |                                  |  requirements     | 
|--------+----------------------------------+-------------------| 
|  000b  |  Write combined header and data  |  Optional         | 
|  001b  |  Vendor-specific                 |  Vendor-specific  | 
|  010b  |  Write data                      |  Optional         | 
|  011b  |  Reserved                        |  Reserved         | 
|  100b  |  Download microcode              |  Optional         | 
|  101b  |  Download microcode and save     |  Optional         | 
|  110b  |  Reserved                        |  Reserved         | 
|  111b  |  Reserved                        |  Reserved         | 
+===============================================================+