| Bit Byte |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|
| 0 | Operation code (ACh) | |||||||
| 1 | Logical unit number | Reserved | ERA | Reserved | RelAdr | |||
| 2 -- 5 |
(MSB)
---|
Logical block address
---|
(LSB) | |||||||
| 6 -- 9 |
(MSB)
---|
Transfer length
---|
(LSB) | |||||||
| 10 | Reserved | |||||||
| 11 | Control | |||||||