Hitachi C4K60 Specifications - Page 75

Read DMA [C8h, C9h]

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7.5.15. Read DMA [C8h, C9h] Task File Registers Command LBA High LBA Mid LBA Low Device/Head Sector Count Features 7 6 5 4 3 2 1 0 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 L = 1: 28-bit LBA address bit 27-24 Sector count XX 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 - 75 -

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K6610170
Rev.2
Dec 22, 2004
- 75 -
7.5.15. Read DMA [C8h, C9h]
Task File Registers
7
6
5
4
3
2
1
0
Command
C8h or C9h
LBA High
L = 0: Cylinder number bit 15 - 8
L = 1: 28-bit LBA address bit
23 - 16
LBA Mid
L = 0: Cylinder number bit 7 - 0
L = 1: 28-bit LBA address bit
15 - 8
LBA Low
L = 0: Sector number
L = 1: 28-bit LBA address bit 7 - 0
Device/Head
X
L
X
DRV L = 0: Head Number
L = 1: 28-bit LBA
address bit 27-24
Sector Count
Sector count
Features
XX
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.