Table 23

+======-========-========-========-========-========-========-========-========+
|   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
|Byte  |        |        |        |        |        |        |        |        |
|======+=======================================================================|
| 0    |                           Operation code                              |
|------+-----------------------------------------------------------------------|
| 1    |   Logical unit number    |                  Reserved                  |
|------+-----------------------------------------------------------------------|
| 2    | (MSB)                                                                 |
|------+---                                                                 ---|
| 3    |                                                                       |
|------+---                        Logical block address (if required)      ---|
| 4    |                                                                       |
|------+---                                                                 ---|
| 5    |                                                                 (LSB) |
|------+-----------------------------------------------------------------------|
| 6    | (MSB)                                                                 |
|------+---                                                                 ---|
| 7    |                           Transfer length (if required)               |
|------+---                        Parameter list length (if required)      ---|
| 8    |                           Allocation length (if required)             |
|------+---                                                                 ---|
| 9    |                                                                 (LSB) |
|------+-----------------------------------------------------------------------|
|10    |                           Reserved                                    |
|------+-----------------------------------------------------------------------|
|11    |                           Control                                     |
+==============================================================================+