5K320 SATA OEM Specification
14.22Read Sector(s) (20h/21h)
Command Block Output Registers |
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| Command Block Input Registers |
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Register | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Register | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Data | - | - | - | - | - | - | - | - | Data | - | - | - | - | - | - | - | - |
Feature | - | - | - | - | - | - | - | - | Error |
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Sector Count | V V V V V V V V | Sector Count | V V V V V V | V V | |||||||||||||
LBA Low | V V V V V V V V | LBA Low | V V V V V V | V V | |||||||||||||
LBA Mid | V V V V V V V V | LBA Mid | V V V V V V | V V | |||||||||||||
LBA High | V V V V V V V V | LBA High | V V V V V V | V V | |||||||||||||
Device | - | L | - | - H H H H | Device | - | - | - | - | H | H | H | H | ||||
Command | 0 | 0 | 1 | 0 | 0 | 0 | 0 | R | Status |
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Error Register
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
CRC | UNC | 0 | IDN | 0 | ABT | T0N | AM |
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| N |
0
V 
0 
V 
0 
V 
0 
0 Table 88 Read Sector(s) Command (20h/21h)
Status Register
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
BSY | RDY | DF | DSC | DRQ | COR | IDX | ERR |
0 | V | 0 | V | - | 0 | 0 | V |
The Read Sector(s) command reads one or more sectors of data from disk media, then transfers the data from the device to the host.
The sectors are transferred through the Data Register 16 bits at a time.
If an uncorrectable error occurs, the read will be terminated at the failing sector.
Output Parameters To The Device
Sector Count | The number of continuous sectors to be transferred. If zero is specified, then 256 sectors |
LBA Low | will be transferred. |
The sector number of the first sector to be transferred. (L=0) | |
LBA High/Mid | In LBA mode, this register contains LBA bits 0 - 7. (L=1) |
The cylinder number of the first sector to be transferred. (L=0) | |
H | In LBA mode, this register contains LBA bits 8 - 15 (Mid), 16 - 23 (High). (L=1) |
The head number of the first sector to be transferred. (L=0) | |
R | In LBA mode, this register contains LBA bits 24 - 27. (L=1) |
The retry bit, but this bit is ignored. | |
Input Parameters From The Device | |
Sector Count | The number of requested sectors not transferred. This will be zero, unless an |
LBA Low | unrecoverable error occurs. |
The sector number of the last transferred sector. (L=0) | |
LBA High/Mid | In LBA mode, this register contains current LBA bits 0 - 7. (L=1) |
The cylinder number of the last transferred sector. (L=0) | |
| In LBA mode, this register contains current LBA bits 8 - 15 (Mid), 16 - 23 (High). |
H | (L=1) |
The head number of the last transferred sector. (L=0) | |
| In LBA mode, this register contains current LBA bits 24 - 27. （L=1） |
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