FDC37C78-HT Standard Microsystems (SMSC), FDC37C78-HT Datasheet - Page 48

• Manufacturer Part Number: FDC37C78-HT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37C78-HT

• Package Type: TQFP
• Lead Free Status / RoHS Status: Compliant

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
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.
MT
0
0
0
0
1
1
1
1
EC
0
0
1
1
0
0
1
1
Table 25 - Verify Command Result Phase Table
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
SC/EOT VALUE
48
command. By setting the EC bit to "1", an implicit
TC will be issued to the FDC. This implicit TC will
(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".
occur when the SC value has decremented to 0
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
TERMINATION RESULT