LPC47N227TQFP Standard Microsystems (SMSC), LPC47N227TQFP Datasheet - Page 56

• Manufacturer Part Number: LPC47N227TQFP
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47N227TQFP

• Lead Free Status / RoHS Status: Not Compliant

NC: No Change, the same value as the one at the beginning of command execution.
LSB: Least Significant Bit, the LSB of H is complemented.
Write Data
After the Write Data command has been issued, the FDC loads the head (if it is in the unloaded state),
waits the specified head load time if unloaded (defined in the Specify command), and begins reading ID
fields. When the sector address read from the diskette matches the sector address specified in the
command, the FDC reads the data from the host via the FIFO and writes it to the sector's data field.
After writing data into the current sector, the FDC computes the CRC value and writes it into the CRC field
at the end of the sector transfer. The Sector Number stored in "R" is incremented by one, and the FDC
continues writing to the next data field. The FDC continues this "Multi-Sector Write Operation". Upon
receipt of a terminal count signal or if a FIFO over/under run occurs while a data field is being written, then
the remainder of the data field is filled with zeros. The FDC reads the ID field of each sector and checks
the CRC bytes. If it detects a CRC error in one of the ID fields, it sets the IC code in Status Register 0 to
"01" (abnormal termination), sets the DE bit of Status Register 1 to "1", and terminates the Write Data
command.
The Write Data command operates in much the same manner as the Read Data command. The following
items are the same. Please refer to the Read Data Command for details:
Transfer Capacity
EN (End of Cylinder) bit
ND (No Data) bit
Head Load, Unload Time Interval
ID information when the host terminates the command
Definition of DTL when N = 0 and when N does not = 0
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.
MT
0
1
HEAD
0
1
0
1
TRANSFERRED TO
FINAL SECTOR
Less than EOT
Less than EOT
Less than EOT
Less than EOT
Equal to EOT
Equal to EOT
Equal to EOT
Equal to EOT
HOST
Table 22 - Result Phase Table
56
C + 1
C + 1
C + 1
NC
NC
NC
NC
NC
C
ID INFORMATION AT RESULT PHASE
LSB
LSB
NC
NC
NC
NC
NC
NC
H
R + 1
R + 1
R + 1
R + 1
01
01
01
01
R
NC
NC
NC
NC
NC
NC
NC
NC
N