Read Dma [C8H, C9H] - Hitachi C4K60 - Travelstar Slim - Hard Drive Specifications

7.5.15. Read DMA [C8h, C9h]

Task File Registers
Command
LBA High
LBA Mid
LBA Low
Device/Head
Sector Count
Features
This command executes in a similar manner to the READ SECTORS command except for the following:
- The host initializes a slave-DMA channel prior to issuing the command.
- Data transfers are qualified by DMARQ and are performed by the slave-DMA channel.
- The device issues only one interrupt per command indicating that data transfer has terminated and
status is valid.
If an error occurs, the read terminates at the sector where the error occurred. The Command Block
Registers contain the cylinder, head, and sector numbers or 28-bit LBA address where the error occurred.
K6610170
Rev.2
Dec 22, 2004
7 6 5 4
C8h or C9h
L = 0: Cylinder number bit 15 - 8
L = 1: 28-bit LBA address bit 23 - 16
L = 0: Cylinder number bit 7 - 0
L = 1: 28-bit LBA address bit 15 - 8
L = 0: Sector number
L = 1: 28-bit LBA address bit 7 - 0
X L X DRV L = 0: Head Number
Sector count
- 75 -
3 2 1
L = 1: 28-bit LBA
address bit 27-24
XX
0