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 38 and Table 39 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 39 - Verify Command Result Phase Table
MT
EC
SC/EOT VALUE
TERMINATION RESULT
0
0
SC = DTL
EOT £ # Sectors Per Side
SC = DTL
EOT > # Sectors Per Side
SC £ # Sectors Remaining AND
EOT £ # Sectors Per Side
SC > # Sectors Remaining OR
EOT > # Sectors Per Side
SC = DTL
EOT £ # Sectors Per Side
SC = DTL
EOT > # Sectors Per Side
SC £ # Sectors Remaining AND
EOT £ # Sectors Per Side
SC > # Sectors Remaining OR
EOT > # Sectors Per Side
Success Termination
Result Phase Valid
0
0
0
1
1
1
1
0
1
1
0
0
1
1
Unsuccessful Termination
Result Phase Invalid
Successful Termination
Result Phase Valid
Unsuccessful Termination
Result Phase Invalid
Successful Termination
Result Phase Valid
Unsuccessful Termination
Result Phase Invalid
Successful Termination
Result Phase Valid
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.
SMSC DS – FDC37N3869
Page 47
Rev. 10/25/2000
SMSC [ SMSC CORPORATION ]
