Read Dma (C8H/C9H); Read Dma Ext (25H) - Toshiba MK3006GAL Specification

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10.8.23 Read DMA (C8h/C9h)

COMMAND CODE
REGISTER SETTING
DR
CY
HD
SN
SC
FT
LBA
This command is basically identical to Sector command except following features.
•
Host initialize the DMA channel before issuing command.
- Data transfer is initiated by DMARQ and handled by the DMA channel in the host.
- Drive issues only one interrupt at the completion of each command to show the status is valid after data
transfer.
During DMA transfer phase, either BSY or DRQ is set to 1.
When a command is completed, CY, HD, SN register (LBA register) shows the sector transferred the latest.
If the drive detects unrecoverable error, the drive terminate the command and CY, HD, SN register (LBA
register) shows the sector where error occurred.

10.8.24 Read DMA EXT (25h)

COMMAND CODE
DR
LBA Current
Low Previous
LBA Current
Mid Previous
LBA Current
High Previous
SC Current
Previous
FT Current
Previous
This command is basically identical to Read DMA command except register setting.
This command is available in LBA addressing only.
1 1 0 0 1 0 0 X
drive no.
starting cylinder
starting head
starting sector
no. of sector to read
staring address
0 0 1 0 0 1 0 1
REGISTER SETTING
drive no.
LBA(7:0)
LBA(31:24)
LBA(15:8)
LBA(39:32)
LBA(23:16)
LBA(47:40)
sector count(7:0)
sector count(15:8)
reserved
reserved
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REGISTER
NORMAL COMPLETION
no change
last possible
last possible
last possible
00H
no change
last address
REGISTER
NORMAL COMPLETION
no change
HOB=0 last address
HOB=1 last address
HOB=0 last address
HOB=1 last address
HOB=0 last address
HOB=1 last address
HOB=0
HOB=1
HOB=0 no change
HOB=1 no change
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00H
00H