82091AA Datasheet, PDF (145/204 Pages) Intel Corporation – ADVANCED INTEGRATED PERIPHERAL (AIP)

82091AA
8 5 1 1 Status Register 0
Bit Symbol
Name
7 6 IC
Interrupt Code
5
SE
4
EC
Seek End
Equipment Check
3
2
H
Head Address
1 0 DS1 0 Drive Select
Description
00 Normal termination of command The specified command
was properly executed and completed without error
01 Abnormal termination of command Command execution was
started but was not successful completed
10 Invalid command The requested command could not be
executed
11 Abnormal termination caused by Polling
The 82091AA completed a SEEK or RECALIBRATE command
or a READ or WRITE with implied seek command
The TRK pin failed to become a ‘‘1’’ after
1 80 step pulses in the RECALIBRATE COMMAND
2 The RELATIVE SEEK command causes the 82078 to step
outward beyond Track 0
Unused This bit is always ‘‘0’’
The current head address
The current selected drive
8 5 1 2 Status Register 1
Bit Symbol
Name
7
EN
End of Cylinder
6
5
DE
4
OR
Data Error
Overrun Underrun
3
2
ND
No Data
1
NW
0
MA
Not Writable
Missing
Address Mark
Description
The 82078 tried to access a section beyond the final sector of
the track (255D) Will be set if TC is not issued after Read or
Write Data Command
Unused This bit is always ‘‘0’’
The 82078 detected a CRC error in either the ID field or the data
field of a sector
Becomes set if the 82078 does not receive CPU or DMA service
within the required time interval resulting in data overrun or
underrun
Unused Ths bit is always ‘‘0’’
Any one of the following
1 READ DATA READ DELETED DATA command the
82091AA did not find the specified sector
2 READ ID command the 82091AA cannot read the ID field
without an error
3 READ TRACK command the 82091AA cannot find the
proper sector sequence
WP pin became a ‘‘1’’ while the 82091AA is executing a WRITE
DATA WRITE DELETED DATA or FORMAT TRACK
command
Any one of the the following
1 The 82091AA did not detect an ID address mark at the
specified track after encountering the index pulse from the
INDX pin twice
2 The 82091AA cannot detect a data address mark or a
deleted data address mark on the specified track
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