9 ata features register, 10 atapi features register, 11 ata sector count register – FUJITSU MCJ3230AP User Manual
Page 82: 12 atapi interrupt reason register
Host Interface
4-10
C156-E205-01EN
4.3.1.9 ATA Features register
This register is used for the SET FEATURES command.
4.3.1.10 ATAPI Features register
This register's bits are defined as shown below.
Table 4.10 Bit definitions of ATAPI Features register
7
6
5
4
3
2
1
0
Reserved
OVERLAP
DMA
Write
!
All values in bits 7 to 2 are ignored.
!
OVERLAP is not used. The ODD ignores the value set in this bit.
!
When DMA is 1, the ODD performs DMA transfer for data transfer.
4.3.1.11 ATA Sector Count register
This register is used for the SET FEATURES command.
4.3.1.12 ATAPI Interrupt Reason register
This register's bits are defined as shown below.
Table 4.11 Bit definitions of ATAPI Interrupt Reason register
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
REL
I/O
C/D
Read
!
Bit 7 to 3 are reserved. It is always 0.
!
REL is not used. It is always 0.
!
I/O indicates the direction of data transfer. See Table 4.12.
!
I/O indicates the type of transfer. See Table 4.12.