FDC37M607 datasheet(54/182 Pages) SMSC

54 / 182 page

Read Deleted Data

This command is the same as the Read Data

command, only it operates on sectors that

contain a Deleted Data Address Mark at the

beginning of a Data Field.

Table 24 describes the effect of the SK bit on

the Read Deleted Data command execution and

results.

Except where noted in Table 24, the C or R

value of the sector address is automatically

incremented (see Table 25).

Table 24 - Skip Bit vs. Read Deleted Data Command

SK BIT

VALUE

DATA ADDRESS

MARK TYPE

ENCOUNTERED

RESULTS

SECTOR

READ?

CM BIT OF

ST2 SET?

DESCRIPTION

OF RESULTS

Normal Data

Deleted Data

Normal Data

Deleted Data

Yes

Address not

incremented.

Next sector not

searched for.

Normal

termination.

Normal

termination.

Sector not read

("skipped").

Normal

termination.

Read A Track

This command is similar to the Read Data

command except that the entire data field is

read continuously from each of the sectors of a

track.

Immediately after encountering a pulse

on the nINDEX pin, the FDC starts to read all

data fields on the track as continuous blocks of

data without regard to logical sector numbers. If

the FDC finds an error in the ID or DATA CRC

check bytes, it continues to read data from the

track and sets the appropriate error bits at the

end of the command. The FDC compares the

ID information read from each sector with the

specified

value

in the

command

and

sets

the ND flag of Status Register 1 to a "1" if there

is no comparison. Multi-track or skip operations

are not allowed with this command. The MT and

SK bits (bits D7 and D5 of the first command

byte respectively) should always be set to "0".

This

command

terminates

when

the

EOT

specified number of sectors has not been read.

If the FDC does not find an ID Address Mark on

the diskette after the second occurrence of a

pulse on the IDX pin, then it sets the IC code in

Status

"01"

(abnormal

termination), sets the MA bit in Status Register

1 to "1", and terminates the command.

FDC37M607 Datasheet(PDF) 54 Page - SMSC Corporation

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