Hitachi C4K60 Specifications - Page 83

Read Long [22h, 23h]

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7.5.18. Read Long [22h, 23h] Task File Registers Command LBA High LBA Mid LBA Low Device/Head Sector Count Features 7 6 5 4 3 2 1 0 22h or 23h 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 01h XX The READ LONG command performs similarly to the READ SECTORS command except that it returns the data and the ECC bytes contained in the data field of the desired sector. During a READ LONG command, the device does not check the ECC bytes to determine if there has been a data error. Only single sector read long operations are supported. The number of ECC bytes transferred will be 4 Bytes (Default). If the ECC transfer length is changed by Feature register 44h, 68 bytes of ECC will be transferred. K6610170 Rev.2 Dec 22, 2004 - 83 -

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K6610170
Rev.2
Dec 22, 2004
- 83 -
7.5.18. Read Long [22h, 23h]
Task File Registers
7
6
5
4
3
2
1
0
Command
22h or 23h
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
01h
Features
XX
The READ LONG command performs similarly to the READ SECTORS command except that it returns the
data and the ECC bytes contained in the data field of the desired sector. During a READ LONG command,
the device does not check the ECC bytes to determine if there has been a data error. Only single sector read
long operations are supported. The number of ECC bytes transferred will be 4 Bytes (Default). If the ECC
transfer length is changed by Feature register 44h, 68 bytes of ECC will be transferred.