LPC47M182 datasheet(67/223 Pages) SMSC

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Advanced I/O Controller with Motherboard GLUE Logic

Datasheet

SMSC LPC47M182

Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)

DATASHEET

Table 6.21 - Skip Bit vs. Read Deleted Data Command

RESULTS

SK BIT

VALUE

DATA ADDRESS

MARK TYPE

ENCOUNTERED

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.

6.13

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

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 nINDEX pin,

then it sets the IC code in Status Register 0 to “01” (abnormal termination), sets the MA bit in Status

Table 6.22 - 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.

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