LPC47S457-NC SMSC [SMSC Corporation], LPC47S457-NC Datasheet - Page 55

• Manufacturer Part Number: LPC47S457-NC
• Description: Advanced I/O with X-Bus Interface
• Manufacturer: SMSC [SMSC Corporation]

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".
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.
Format A Track
The Format command allows an entire track to be formatted. After a pulse from the IDX pin is detected, the FDC starts
writing data on the disk including gaps, address marks, ID fields, and data fields per the IBM System 34 or 3740 format
(MFM or FM respectively). The particular values that will be written to the gap and data field are controlled by the values
programmed into N, SC, GPL, and D which are specified by the host during the command phase. The data field of the
sector is filled with the data byte specified by D. The ID field for each sector is supplied by the host; that is, four data
bytes per sector are needed by the FDC for C, H, R, and N (cylinder, head, sector number and sector size respectively).
After formatting each sector, the host must send new values for C, H, R and N to the FDC for the next sector on the
track. The R value (sector number) is the only value that must be changed by the host after each sector is formatted.
This allows the disk to be formatted with nonsequential sector addresses (interleaving).
formatting continues for the whole track until the FDC encounters a pulse on the nINDEX pin again and it terminates the
command.
Table 24 contains typical values for gap fields which are dependent upon the size of the sector and the number of
sectors on each track. Actual values can vary due to drive electronics.
SMSC DS – LPC47S45x
MT
0
0
0
0
1
1
1
1
EC
0
0
1
1
0
0
1
1
Table 23 − 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
DATASHEET
Page 55 of 259
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
This incrementing and
Rev. 07/09/2001