Error Register; Feature Register - Seagate STT20000A Product Manual

ATAPI Interface

Error Register

Feature Register

STT20000A Product Manual
The following layout represents the Error Register.
7 6
Sense Key [3..0]
Bit(s) Mnemonic
7-4 Sense Key
3 MCR
2 ABRT
1 EOM
0 ILI
The following layout represents the Feature Register.
7 6
. .
Bit Mnemonic
0 DMA
The value in this register must be set before every ATAPI command that transfers
data (including log/mode set/sense) to determine the transfer method. This register
is overwritten by the drive after every command completion to present Error
5 4 3
MCR
Description
Set to indicate the reason for the CHECK bit being set in
the Status Register.
Media Change Request—Always 0.
Aborted Command—Set when an ATA or ATAPI
command is aborted.
End Of Media—The end of the current partition was
detected. On a WRITE command, unrecoverable data
might be left in the buffer.
Illegal Length Indication—This bit is set when an illegal
length block is read. Sense Status also indicates ILI.
5 4 3
. . .
Description
DMA Data Transfer—When this bit is a 1, the data transfer
is in DMA mode. If the bit is 0, PIO data transfer is used.
All ATAPI packet commands are transferred in PIO mode.
Chapter 5
2 1
ABRT EOM
2 1
. .
0
ILI
0
DMA
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