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".
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
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 Register 0 to
"01" (abnormal termination), sets the MA bit in
Status Register 1 to "1", and terminates the
command.
TABLE 27 - RESULT PHASE
FINAL SECTOR
TRANSFERRED TO
HOST
MT
HEAD
ID INFORMATION AT RESULT PHASE
C
H
R
N
0
0
1
0
1
Less than EOT
Equal to EOT
Less than EOT
Equal to EOT
Less than EOT
Equal to EOT
Less than EOT
Equal to EOT
NC
C + 1
NC
C + 1
NC
NC
NC
NC
NC
NC
NC
LSB
NC
LSB
R + 1
01
R + 1
01
R + 1
01
R + 1
01
NC
NC
NC
NC
NC
NC
NC
NC
1
NC
C + 1
NC:
LSB:
No Change, the same value as the one at the beginning of command execution.
Least Significant Bit, the LSB of H is complemented.
57
SMSC [ SMSC CORPORATION ]
