Read Dma Queued Ext (26H); Figure 115. Read Dma Queued Ext Command (26H) - Hitachi ic35l060avv207-0 - Deskstar 60 GB Hard Drive Specifications

11.17 Read DMA Queued Ext (26h)

Command Block Output
Registers
Register
Data Low
Data High
Current
Fea-
ture
Previous
Current
Sector
Count
Previous
Current
Sector
Number
Previous
Cylin-
Current
der
Previous
Low
Cylin-
Current
der
Previous
High
Device/Head
Command
Error Register
7 6 5
CRC UNC 0
V V 0

Figure 115. Read DMA Queued Ext Command (26h)

This command executes in a similar manner to a READ DMA command. The device may perform a bus
release or it may execute the data transfer without performing a bus release if the data is ready to
transfer.
If the device performs a bus release, the host shall re-select the device using the SERVICE command.
Once the data transfer is begun, the device does not perform a bus release until the entire data transfer
has been completed
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 V V V V V
1 1 1 0 - - - -
0 0 1 0 0 1 0 1
4 3 2 1 0
IDN 0 ABT T0N AMN
V 0 V 0 V
Deskstar 180GXP hard disk drive specifications
Command Block Input
Registers
Register
Data Low
Data High
Error
HOB=0
Sector
Count
HOB=1
HOB=0
Sector
Number
HOB=1
Cylin- HOB=0
der
HOB=1
Low
Cylin- HOB=0
der
HOB=1
High
Device/Head
Status
Status Register
7 6 5 4
BSY RDY DF DSC
0 V 0 V
138
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
...See Below...
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
- - - - - - - -
...See Below...
3 2 1 0
DRQ COR IDX ERR
– 0 – V