LPC47M14X datasheet(53/205 Pages) SMSC

53 / 205 page

SMSC DS – LPC47M14X

Page 53

Rev. 05/02/2000

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, the TC cycle 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 23 and Table 24 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 24 – Verify Command Result Phase Table

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.

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