82091AA Datasheet, PDF (148/204 Pages) Intel Corporation – ADVANCED INTEGRATED PERIPHERAL (AIP)

82091AA
code in Status Register 0 to 01 (Abnormal termina-
tion) sets the ND bit in Status Register 1 to 1 indi-
cating 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 If a CRC error oc-
curs in the ID or data field the FDC sets the IC code
in Status Register 0 to 01 (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 Com-
mand
Table 27 describes the affect of the SK bit on the
READ DATA command execution and results
8 5 2 2 Read Deleted Data
This command is the same as the READ DATA
Command except that it operates on sectors that
contain a deleted data address mark at the begin-
ning of a data field Table 28 describes the affect of
the SK bit on the READ DELETED DATA Command
execution and results
SK Bit
Value
0
0
1
1
Table 27 Skip Bit vs READ DATA Command
Data Address Mark Sector Results CM Bit
Type Encountered Read
of ST2 Set
Description of Results
Normal Data
Yes
No
Normal Termination
Deleted Data
Yes
Yes
Address Not Incremented Next Sector
Not Searched For
Normal Data
Yes
No
Normal Termination
Deleted Data
No
Yes
Normal Termination Sector Not Read
(‘‘Skipped’’)
Except where noted in Table 27 the C or R value of the sector address is automatically incremented (see
Table 29)
SK Bit
Value
0
0
1
1
Table 28 Skip Bit vs READ DELETED DATA Command
Data Address Mark Sector Results CM Bit
Type Encountered Read
of ST2 Set
Description of Results
Normal Data
Yes
Yes
Normal Termination
Deleted Data
Yes
No
Address Not Incremented Next Sector
Not Searched For
Normal Data
No
Yes
Normal Termination Sector Not Read
(‘‘Skipped’’)
Deleted Data
Yes
No
Normal Termination
Except where noted in Table 28 the C or R value of the sector address is automatically incremented (see
Table 29)
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