Interface
A host system can select the following transfer mode using the SET FEATURES command.
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Multiword DMA transfer mode 0 to 2
Ultra DMA transfer mode 0 to 5
At command issuance (I/O registers setting contents)
1F7H(CM) | 1 | 1 | 0 | 0 | 1 | 0 | 1 | R |
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1F6H(DH) | x | L | x | DV | Start head No. / LBA |
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1F5H(CH) | Start cylinder No. [MSB] / LBA |
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1F4H(CL) | Start cylinder No. [LSB] / LBA |
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1F3H(SN) | Start sector No. / LBA [LSB] |
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1F2H(SC) | Transfer sector count |
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1F1H(FR) | xx |
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At command completion (I/O registers contents to be read)
1F7H(ST) | Status information |
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1F6H(DH) | x |
| L | x | DV | End head No. / LBA [MSB] |
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1F5H(CH) | End cylinder No. [MSB] / LBA | |||||
1F4H(CL) | End cylinder No. [LSB] / LBA | |||||
1F3H(SN) | End sector No. / LBA [LSB] | |||||
1F2H(SC) | 00 (*1) |
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1F1H(ER) | Error information |
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*1 If the command is terminated due to an error, the remaining number of sectors of which data was not transferred is set in this register.
(8) WRITE VERIFY (X’3C’)
This command operates similarly to the WRITE SECTOR(S) command except that the device verifies each sector immediately after being written. The verify operation is a read and check for data errors without data transfer. Any error that is detected during the verify operation is posted.
After all sectors are verified, the last interruption (INTRQ for command termination) is generated.
