Seagate STT20000A, Product Manual

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ATAPI Interface Chapter 5
STT20000A Product Manual Page 33
Error Register
The following layout represents the Error Register.
7 6 5 4 3 2 1 0
Sense Key [3..0] MCR ABRT EOM ILI
Bit(s) Mnemonic Description
7-4 Sense Key Set to indicate the reason for the CHECK bit being set in
the Status Register.
3 MCR Media Change Request—Always 0.
2 ABRT Aborted Command—Set when an ATA or ATAPI
command is aborted.
1 EOM End Of Media—The end of the current partition was
detected. On a WRITE command, unrecoverable data
might be left in the buffer.
0 ILI Illegal Length Indication—This bit is set when an illegal
length block is read. Sense Status also indicates ILI.
Feature Register
The following layout represents the Feature Register.
7 6 5 4 3 2 1 0
. . . . . . . DMA
Bit Mnemonic Description
0 DMA 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.
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