| ATA REGISTERS |
SECTOR NUMBER REGISTER
The Sector Number register is set by the host to specify the starting sector number associated with the next ATA command to be executed. Following a qualified ATA command sequence, the device sets the register value to the last sector read or written as a result of the previous AT command.
When Logical Block Addressing (LBA) mode is implemented and the host issues a command, the contents of the register describe the Logical Block Number bits A[7:0]. Following an ATA command, the device loads the register with the LBA block number resulting from the last ATA command.
Table 20: Sector Number Register
Operation | D7 | D6 | D5 | D4 | D3 | D2 |
| D1 | D0 |
Read/Write |
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| Sector Number (CHS Addressing) |
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| Logical Block Number bits | ||||||||
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Default Value | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 1 |
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SILICONSYSTEMS PROPRIETARY
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All unauthorized use and/or reproduction is prohibited.
PAGE 18 | JUNE 17, 2008 | DOCUMENT: |