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 |
+==============================================================================+