LPC47N227TQFP Standard Microsystems (SMSC), LPC47N227TQFP Datasheet - Page 55

• Manufacturer Part Number: LPC47N227TQFP
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47N227TQFP

• Lead Free Status / RoHS Status: Not Compliant

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 21 describes the effect of the SK bit on the Read Deleted Data command execution and results.
Except where noted in Table 21, the C or R value of the sector address is automatically incremented (see
Table 22).
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.
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 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 nINDEX pin,
then it sets the IC code in Status Register 0 to "01" (abnormal termination), sets the MA bit in Status
Register 1 to "1", and terminates the command.
VALUE
SK BIT
0
0
1
1
Normal Data
Deleted Data
Normal Data
Deleted Data
Table 21 - Skip Bit vs. Read Deleted Data Command
DATA ADDRESS
ENCOUNTERED
MARK TYPE
SECTOR
READ?
Yes
Yes
Yes
No
55
CM BIT OF
ST2 SET?
Yes
Yes
No
No
RESULTS
Address not
incremented. Next
sector not
searched for.
Normal
termination.
Normal
termination.
Sector not read
("skipped").
Normal
termination.
DESCRIPTION OF
The FDC compares the ID
RESULTS