FDC37N869 View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
FDC37N869
SMSC -> Microchip
'FDC37N869' PDF : 147 Pages View PDF
Table 38 - Result Phase Table
FINAL SECTOR
TRANSFERRED TO
MT
HEAD
HOST
ID INFORMATION AT RESULT PHASE
C
H
R
N
Less than EOT
NC
NC
R+1
NC
0
0
Equal to EOT
C+1
NC
01
NC
Less than EOT
NC
NC
R+1
NC
1
Equal to EOT
C+1
NC
01
NC
Less than EOT
NC
NC
R+1
NC
1
0
Equal to EOT
NC
LSB
01
NC
Less than EOT
NC
NC
R+1
NC
1
Equal to EOT
C+1
LSB
01
NC
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
SMSC DS – FDC37N869
Page 49
Rev. 11/09/2000
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