5.3 Host Commands
C141-E218 5-111
(38) READ DMA EXT (X’25’): Option (customizing)
• Description
This command is the extended command of the READ DMA command. The
LBA specification is increased from 28 bits to 48 bits, and the maximum number
of sectors that can be transferred by a single command is changed from 100h to
10000h. Other command controls are the same as those of the READ DMA
command.
At command issuance (I/O registers setting contents)
1F7h(CM) 0 0 1 0 0 1 0 1
1F6h(DH) 1 L 1 DV xx
1F5h(CH) P
1F5h(CH) C
1F4h(CL) P
1F4h(CL) C
1F3h(SN) P
1F3h(SN) C
1F2h(SC) P
1F2h(SC) C
1F1h(FR) P
1F1h(FR) C
LBA (47-40)
LBA (23-16)
LBA (39-32)
LBA (15-8)
LBA (31-24)
LBA (7-0)
Sector count (15-8)
Sector count (7-0)
xx
xx
C: Current
P: Previous
At command completion (I/O registers contents to be read)
1F7h(ST) Status information
1F6h(DH) 1 L 1 DV xx
1F5h(CH) 1
1F5h(CH) 0
1F4h(CL) 1
1F4h(CL) 0
1F3h(SN) 1
1F3h(SN) 0
1F2h(SC) 1
1F2h(SC) 0
1F1h(ER)
LBA (47-40)
LBA (23-16)
LBA (39-32)
LBA (15-8)
LBA (31-24)
LBA (7-0)
xx
xx
Error information
0: HOB=0
1: HOB=1