FDC37B78X 查看數據表（PDF） - SMSC -> Microchip

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FDC37B78X

Enhanced Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR

SMSC -> Microchip 

TABLE 27 - RESULT PHASE TABLE

FINAL SECTOR

MT

HEAD

TRANSFERRED TO

ID INFORMATION AT RESULT PHASE

HOST

C

H

R

N

0

0

Less than EOT

NC

NC

R+1

NC

Equal to EOT

C+1

NC

01

NC

1

Less than EOT

NC

NC

R+1

NC

Equal to EOT

C+1

NC

01

NC

1

0

Less than EOT

NC

NC

R+1

NC

Equal to EOT

NC

LSB

01

NC

1

Less than EOT

NC

NC

R+1

NC

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

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.

Verify

The Verify command is used to verify the data

stored on a disk. This command acts exactly

like a Read Data command except that no data

is transferred to the host. Data is read from the

disk and CRC is computed and checked against

the previously-stored value.

60

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