FDC37M607 datasheet(56/182 Pages) SMSC

56 / 182 page

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.

Because data is not transferred to the host, TC

(pin

89) cannot be used to terminate this

command.

By setting the EC bit to "1", an

implicit TC will be issued to the FDC. This

implicit TC will occur when the SC value has

decremented to 0 (an SC value of “0” will verify

256 sectors).

This command can also be

terminated by setting the EC bit to "0" and the

EOT value equal to the final sector to be

checked. If EC is set to "0", DTL/SC should be

programmed to 0FFH.

Refer to Table 25 and

Table 26 for information concerning the values

of MT and EC versus SC and EOT value.

Definitions:

# Sectors Per Side = Number of formatted

sectors per each side of the disk.

# Sectors Remaining = Number of formatted

sectors left which can be read, including side 1

of the disk if MT is set to "1".

Table 26 - Verify Command Result Phase

SC/EOT VALUE

TERMINATION RESULT

SC = DTL

EOT

≤ # Sectors Per Side

Success Termination

Result Phase Valid

SC = DTL

EOT > # Sectors Per Side

Unsuccessful Termination

Result Phase Invalid

≤ # Sectors Remaining AND

EOT

≤ # Sectors Per Side

Successful Termination

Result Phase Valid

SC > # Sectors Remaining OR

EOT > # Sectors Per Side

Unsuccessful Termination

Result Phase Invalid

SC = DTL

EOT

≤ # Sectors Per Side

Successful Termination

Result Phase Valid

SC = DTL

EOT > # Sectors Per Side

Unsuccessful Termination

Result Phase Invalid

≤ # Sectors Remaining AND

EOT

≤ # Sectors Per Side

Successful Termination

Result Phase Valid

SC > # Sectors Remaining OR

EOT > # Sectors Per Side

Unsuccessful Termination

Result Phase Invalid

NOTE: If MT is set to "1" and the SC value is greater than the number of remaining formatted sectors

on Side 0, verifying will continue on Side 1 of the disk.

FDC37M607 Datasheet(PDF) 56 Page - SMSC Corporation

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