FDC37B72X(1999) View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
Manufacturer
FDC37B72X Datasheet PDF : 244 Pages
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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 Register 0 to "01" (abnormal
termination), sets the MA bit in Status Register
1 to "1", and terminates the command.
MT
0
1
NC:
LSB:
TABLE 27 - RESULT PHASE
FINAL SECTOR
HEAD TRANSFERRED TO
ID INFORMATION AT RESULT PHASE
HOST
C
H
R
N
0
Less than EOT
NC
NC
R+1
NC
Equal to EOT
C+1
NC
01
NC
1
Less than EOT
NC
NC
R+1
NC
Equal to EOT
C+1
NC
01
NC
0
Less than EOT
NC
NC
R+1
NC
Equal to EOT
NC
LSB
01
NC
1
Less than EOT
NC
NC
R+1
NC
Equal to EOT
C+1
LSB
01
NC
No Change, the same value as the one at the beginning of command execution.
Least Significant Bit, the LSB of H is complemented.
57
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