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FDC37C78-HT Datasheet(PDF) 48 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 48 Page - Microchip Technology |
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48 / 82 page  48 Write Deleted Data This command is almost the same as the Write Data command except that a Deleted Data Address Mark is written at the beginning of the Data Field instead of the normal Data Address Mark. This command is typically used to mark a bad sector containing an error on the floppy disk. Verify The Verify command is used to verify the data stored on a disk. This command acts exactly like a Read Data command except that no data is transferred to the host. Data is read from the disk and CRC is computed and checked against the previously-stored value. Because data is not transferred to the host, TC (pin 25) cannot be used to terminate this command. By setting the EC bit to "1", an implicit TC will be issued to the FDC. This implicit TC will occur when the SC value has decremented to 0 (an SC value of 0 will verify 256 sectors). This command can also be terminated by setting the EC bit to "0" and the EOT value equal to the final sector to be checked. If EC is set to "0", DTL/SC should be programmed to 0FFH. Refer to Table 26 and Table 27 for information concerning the values of MT and EC versus SC and EOT value. Definitions: # Sectors Per Side = Number of formatted sectors per each side of the disk. # Sectors Remaining = Number of formatted sectors left which can be read, including side 1 of the disk if MT is set to "1". Table 25 - Verify Command Result Phase Table MT EC SC/EOT VALUE TERMINATION RESULT 0 0 SC = DTL EOT ≤ # Sectors Per Side Success Termination Result Phase Valid 0 0 SC = DTL EOT > # Sectors Per Side Unsuccessful Termination Result Phase Invalid 0 1 SC ≤ # Sectors Remaining AND EOT ≤ # Sectors Per Side Successful Termination Result Phase Valid 0 1 SC > # Sectors Remaining OR EOT > # Sectors Per Side Unsuccessful Termination Result Phase Invalid 1 0 SC = DTL EOT ≤ # Sectors Per Side Successful Termination Result Phase Valid 1 0 SC = DTL EOT > # Sectors Per Side Unsuccessful Termination Result Phase Invalid 1 1 SC ≤ # Sectors Remaining AND EOT ≤ # Sectors Per Side Successful Termination Result Phase Valid 1 1 SC > # Sectors Remaining OR EOT > # Sectors Per Side Unsuccessful Termination Result Phase Invalid NOTE: If MT is set to "1" and the SC value is greater than the number of remaining formatted sectors on Side 0, verifying will continue on Side 1 of the disk. |
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