FDC37C672QFP SMSC Corporation, FDC37C672QFP Datasheet - Page 53

• Manufacturer Part Number: FDC37C672QFP
• Description: ENHANCED SUPER I/O CONTROLLER WITH FAST IR
• Manufacturer: SMSC Corporation

Enhanced Super I/O Controller with Fast IR
Datasheet
8.1.5
8.1.6
Note:
SMSC FDC37C672
MT
0
0
0
0
1
1
1
1
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 89) 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 8.5 and Table 8.6 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".
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.
EC
0
0
1
1
0
0
1
1
PRELIMINARY DATASHEET
SC/EOT VALUE
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
Table 8.6 - Verify Command Result Phase Table
Page 53
TERMINATION RESULT
Success 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
Successful Termination
Result Phase Valid
Unsuccessful Termination
Result Phase Invalid
Rev. 10-29-03