FDC37M607 datasheet(55/182 Pages) SMSC

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Table 25 - Result Phase Table

HEAD

FINAL SECTOR

TRANSFERRED TO

ID INFORMATION AT RESULT PHASE

HOST

Less than EOT

R + 1

Equal to EOT

C + 1

Less than EOT

R + 1

Equal to EOT

C + 1

Less than EOT

R + 1

Equal to EOT

LSB

Less than EOT

R + 1

Equal to EOT

C + 1

LSB

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 ne 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.

FDC37M607 Datasheet(PDF) 55 Page - SMSC Corporation

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