5K320 SATA OEM Specification
108
14.15 Read DMA Ext (25h)
Command Block Output Registers
Command Block Input Registers
Register 7
6
5
4
3
2
1
0
Register 7
6
5
4
3
2
1
0
Data Low - - - - -
- - -
Data Low -
- - - - - - -
Data High - - - - -
- - -
Data High -
- - - - - - -
Current - - - - -
- - -
Error ...See Below... Feature
Previous - - - - -
- - -
Current V
V
V
V
V
V
V
V
HOB=0
-
- - - - - - - Sector Count
Previous V
V
V
V
V
V
V
V
Sector Count
HOB=1
-
- - - - - - -
Current V
V
V
V
V
V
V
V
HOB=0
V
V
V
V
V
V
V
V
LBA Low
Previous V
V
V
V
V
V
V
V
LBA Low
HOB=1
V
V
V
V
V
V
V
V
Current V
V
V
V
V
V
V
V
HOB=0
V
V
V
V
V
V
V
V
LBA Mid
Previous V
V
V
V
V
V
V
V
LBA Mid
HOB=1
V
V
V
V
V
V
V
V
Current V
V
V
V
V
V
V
V
HOB=0
V
V
V
V
V
V
V
V
LBA High
Previous V
V
V
V
V
V
V
V
LBA High
HOB=1
V
V
V
V
V
V
V
V
Device - 1
- - -
- - -
Device -
- - - - - - -
Command 0
0
1
0
0
1
0
1
Status ...See Below...
Error Register
Status Register
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
CRC
UNC
0 IDN 0 ABT
T0N AMN
BSY
RDY
DF
DSC
DRQ
COR
IDX ERR
V V 0 V 0 V 0 0
0 V 0 V - 0 0 V
Table 70 Read DMA Ext Command (25h)
The Read DMA Ext command reads one or more sectors of data from disk media, then transfers the
data from the device to the host.
The sectors are transferred through the Data Register 16 bits at a time.
The host initializes a slave-DMA channel prior to issuing the command. The data transfers are
qualified by DMARQ and are performed by the slave-DMA channel. The device issues only one
interrupt per command to indicate that data transfer has terminated and status is available.
If an uncorrectable error occurs, the read will be terminated at the failing sector.
Output Parameters To The Device
Sector Count Current The number of sectors to be transferred low order, bits (7:0).
Sector Count Previous The number of sectors to be transferred high order, bits (15:8). If 0000h in the Sector
Count register is specified, then 65,536 sectors will be transferred.
LBA Low Current LBA (7:0)
LBA Low Previous LBA (31:24)
LBA Mid Current LBA (15:8)
LBA Mid Previous LBA (39:32)
LBA High Current LBA (23:16)
LBA High Previous LBA (47:40)
Input Parameters From The Device
LBA Low (HOB=0) LBA (7:0) of the address of the first unrecoverable error.
LBA Low (HOB=1) LBA (31:24)of the address of the first unrecoverable error.
LBA Mid (HOB=0) LBA (15:8)of the address of the first unrecoverable error.
LBA Mid (HOB=1) LBA (39:32)of the address of the first unrecoverable error.
LBA High (HOB=0) LBA (23:16)of the address of the first unrecoverable error.
LBA High (HOB=1) LBA (47:40)of the address of the first unrecoverable error.
