4.5 ATA Commands
4.5 ATA Commands
Table 4.17 lists supported ATA commands.
This section represents ODD registers as shown below.
Cylinders High/Low registers: CY
Sector register: SC
Device/Head register: DH
Sector Number register: SN
Features register: FR
Table 4.17 Command codes and parameters
Protocol | Command name | Command |
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| FR | SC | SN | CY | DH |
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PI | IDENTIFY PACKET DEVICE | A1h |
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| D | 4.5.1 |
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− | PACKET | A0h | y | y | y | y | D | 4.5.2 |
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ND | DEVICE RESET | 08h |
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| D | 4.5.3 |
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ND | CHECK POWER MODE | E5h |
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| D | 4.5.4 |
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ND | EXECUTE DEVICE | 90h |
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| D* | 4.5.5 |
| DIAGNOSTIC |
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ND | GET MEDIA STATUS | DAh |
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| D | 4.5.6 |
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ND | IDLE IMMEDIATE | E1h |
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| D | 4.5.7 |
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ND | NOP | 00h |
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| y | 4.5.8 |
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ND | SERVICE (Not supported) | 42h |
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| D | 4.5.9 |
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ND | SET FEATURES | EFh | y | y |
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| D | 4.5.10 |
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ND | SLEEP | E6h |
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| D | 4.5.11 |
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ND | STANDBY IMMEDIATE | E0h |
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| D | 4.5.12 |
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−− | RESERVED: Other codes |
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| Notes: |
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1.y - This register contains parameters effective to run the command.
D - Indicates that only the Device parameter is effective and the LUN parameter is ineffective.
D* - Device 0 is addressed, but both devices execute the command.
2.The protocol above indicates the command protocol used.
