Read Dma Ext (25H); Figure 66 Read Dma Ext (25H) - Hitachi HTS541616J9AT00 - Travelstar 160 GB Hard Drive Specifications

2.5 inch ata/ide hard disk drive
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14.14 Read DMA EXT (25h)

Command Block Output Registers
Register
Data Low
Data High
Feature
Current
Previous
Sector Count
Current
Previous
LBA Low
Current
Previous
LBA Mid
Current
Previous
LBA High
Current
Previous
Device
Command
Error Register
7
6
5
4
CRC UNC
0
IDN
V
V
0
V

Figure 66 Read DMA EXT (25h)

The Read DMA 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
Sector Count Previous
LBA Low Current
LBA Low Previous
LBA Mid Current
LBA Mid Previous
LBA High Current
LBA High Previous
Input Parameters From The Device
LBA Low (HOB=0)
LBA Low (HOB=1)
LBA Mid (HOB=0)
LBA Mid (HOB=1)
LBA High (HOB=0)
LBA High (HOB=1)
Travelstar 5K160 (PATA) Hard Disk Drive Specification
7 6 5 4 3 2 1 0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
-
1
- D -
-
-
0 0 1 0 0 1 0 1
3
2
1
0
0
ABT T0N AMN
0
V
0
0
The number of sectors to be transferred low order, bits (7:0).
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 (7:0)
LBA (31:24)
LBA (15:8)
LBA (39:32)
LBA (23:16)
LBA (47:40)
LBA (7:0) of the address of the first unrecoverable error.
LBA (31:24)of the address of the first unrecoverable error.
LBA (15:8)of the address of the first unrecoverable error.
LBA (39:32)of the address of the first unrecoverable error.
LBA (23:16)of the address of the first unrecoverable error.
LBA (47:40)of the address of the first unrecoverable error.
118 / 188
Command Block Input Registers
Register
-
Data Low
-
Data High
-
Error
-
Sector Count
HOB=0 -
HOB=1 -
LBA Low
HOB=0 V V V V V V V V
HOB=1 V V V V V V V V
LBA Mid
HOB=0 V V V V V V V V
HOB=1 V V V V V V V V
LBA High
HOB=0 V V V V V V V V
HOB=1 V V V V V V V V
-
Device
Status
Status Register
7
6
5
4
BSY RDY DF DSC DRQ COR IDX
0
V
0
V
7 6 5 4 3 2 1 0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
...See Below...
-
-
-
-
-
-
-
-
-
-
-
-
-
-
V -
-
-
-
-
-
-
...See Below...
3
2
1
0
ERR
-
0
-
V

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