fdc37m707 Standard Microsystems Corp., fdc37m707 Datasheet - Page 52
fdc37m707
Manufacturer Part Number
fdc37m707
Description
Fdc37m707 Enhanced Super I/o Controller With Wake-up Features
Manufacturer
Standard Microsystems Corp.
Datasheet
1.FDC37M707.pdf
(194 pages)
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If the host terminates a read or write operation
in the FDC, the ID information in the result
phase is dependent upon the state of the MT bit
and EOT byte. Refer to Table 20.
At the completion of the Read Data command,
the head is not unloaded until after the Head
Unload Time Interval (specified in the Specify
command) has elapsed.
another command before the head unloads,
then the head settling time may be saved
between subsequent reads.
If the FDC detects a pulse on the nINDEX pin
twice without finding the specified sector
(meaning that the diskette's index hole passes
through index detect logic in the drive twice), the
FDC sets the IC code in Status Register 0
MT
0
1
0
1
0
1
N
1
1
2
2
3
3
If the host issues
256 x 26 = 6,656
256 x 52 = 13,312
512 x 15 = 7,680
512 x 30 = 15,360
1024 x 8 = 8,192
1024 x 16 = 16,384
MAXIMUM TRANSFER
Table 20 - Effects of MT and N Bits
CAPACITY
52
to
the ND bit in Status Register 1 to "1" indicating a
sector not found, and terminates the Read Data
Command.
After reading the ID and Data Fields in each
sector, the FDC checks the CRC bytes.
CRC error occurs in the ID or data field, the
FDC sets the IC code in Status Register 0 to
"01" indicating abnormal termination, sets the
DE bit flag in Status Register 1 to "1", sets the
DD bit in Status Register 2 to "1" if CRC is
incorrect in the ID field, and terminates the Read
Data Command. Table 21 describes the effect
of the SK bit on the Read 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 23).
26 at side 0 or 1
26 at side 1
15 at side 0 or 1
15 at side 1
8 at side 0 or 1
16 at side 1
"01" indicating abnormal termination, sets
FINAL SECTOR READ
FROM DISK
If a
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