Table 24 - Result Phase Table
FINAL SECTOR ID INFORMATION AT RESULT PHASE
HEAD
TRANSFERRED TO HOST
C
H
R
N
MT
0
Less than EOT
Equal to EOT
Less than EOT
Equal to EOT
Less than EOT
Equal to EOT
Less than EOT
Equal to EOT
NC
NC
NC
NC
NC
NC
LSB
NC
LSB
R + 1
01
NC
NC
NC
NC
NC
NC
NC
NC
C + 1
NC
0
1
0
1
R + 1
01
C + 1
NC
R + 1
01
NC
1
NC
R + 1
01
C + 1
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
Status Register 0 to "01" (abnormal termination), sets the
DE bit of Status Register 1 to "1", and terminates the
Write Data command.
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.
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
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.
!
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.
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
Verify
59
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