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(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)
1F7
(CM)
h
1F6
(DH)
h
1F5
(CH) P
h
1F5
(CH) C
h
1F4
(CL) P
h
1F4
(CL) C
h
1F3
(SN) P
h
1F3
(SN) C
h
1F2
(SC) P
h
1F2
(SC) C
h
1F1
(FR) P
h
1F1
(FR) C
h
C: Current
P: Previous
At command completion (I/O registers contents to be read)
1F7
(ST)
h
1F6 DH)
(
h
1F5
(CH) 1
h
1F5
(CH) 0
h
1F4
(CL) 1
h
1F4
(CL) 0
h
1F3
(SN) 1
h
1F3
(SN) 0
h
1F2
(SC) 1
h
1F2
(SC) 0
h
1F1
(ER)
h
0: HOB=0
1: HOB=1
C141-E258
0
0
1
0
1
L
1
DV
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
Status information
1
L
1
DV
LBA (47-40)
LBA (23-16)
LBA (39-32)
LBA (15-8)
LBA (31-24)
LBA (7-0)
xx
xx
Error information
5.3 Host Commands
0
1
0
1
xx
xx
5-111
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