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register within the periods shown in table 6-S after the data transmission
request, the DOR (data overrun) bit of SSBl is set, a CRC check is performed
on the sector data read and the command is abnormally terminated.
Table 6-S.
Read Data Transfer Request wait Times
8"/5" (pin 6)
FM mode
MFM mode
Low
54 )Js
22 )Js
High
27 )Js
11 )Js
Multisector/Multitrack Read:
If the i:5E'ND signal is not received even after
the last byte 6f a sector has been transmitted to the host, SA is incremented
and the FDC starts to process the next sector (multisector read).
However, if SA of the processed sector is ESN, the following operations are
performed depending on the Head Address HA and the MT bit of the command code.
MT bit
=
1 and HA
HEX 00:
SA and HA are set to HEX 01 and a multitrack
read is performed.
MT bit
=
0 or HA
=
HEX 01:
The NDE (No DMA end) bit of SSBI is set and the
command execution is abnormally terminated.
When the DEND signal is received in the middle of a sector data transfer, the
data transmission to the host stops immediately.
However, the rest of the
sector data is read from the drive and its CRC bytes are checked.
If there
exists no CRC error, the command execution is terminated normally.
Also, when
the DEND signal is received during the transmission of the last byte of a
sector, access of the next sector is not performed and the command execution
is terminated normally.
If the DEND signal is received within the time shown
below after a data transmission request, transmission of the next data byte is
not performed.
For DEND signal received during the transmission of a byte in the middle of
a sector, see table 6-9.
Table 6-9.
BEND in the Middle of a Sector
S"/5" (pin 6)
FM mode
MFM mode
Low
59 lls
27 )Js
High
27 )Js
11 )Js
For DEND signal received during the transmission of the last byte of a
sector, see table 6-10.
HITACHI 45