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PAGE 42 JUNE 17, 2008 DOCUMENT: 3650H-02DSR
SSD-HXXX(I)-3650 DATA SHEET ATA COMMAND BLOCK AND SET DESCRIPTION
Read Sector — 20h, 21h
The Read Sector command allows the host to read sectors 1 to 256 as
specified in the Sector Count register. If the sector count is set to 0h, all 256
sectors of data are made available. When the command code is issued and
the first sector of data has been transferred to the buffer, the DRQ bit is set.
The Read Sector command is terminated by writing the cylinder, head, and
sector number of the last sector read in the task file. On error, the read
operation is aborted in the errant sector.
Table 43: Read Sector — 20h, 21h
Register
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
Feature X
Sector Count Sector Count
Sector Number Sector Number (LBA7-0)
Cylinder Low Cylinder Low (LBA15-8)
Cylinder High Cylinder High (LBA23-16)
Drive Head 1 LBA 1 Drive Head Number (LBA27-24)
Command 20h or 21h
- DATA SHEET 1
- REVISION HISTORY 2
- TABLE OF CONTENTS 3
- LIST OF FIGURES 7
- LIST OF TABLES 9
- ILICONSYSTEMS PROPRIETARY 10
- SILICONSYSTEMS PROPRIETARY 12
- PHYSICAL SPECIFICATIONS 13
- PIN LOCATIONS 14
- JUMPER SETTINGS 14
- PRODUCT SPECIFICATIONS 15
- ENVIRONMENTAL SPECIFICATIONS 16
- ELECTRICAL SPECIFICATION 17
- SIGNAL DESCRIPTIONS 18
- ABSOLUTE MAXIMUM RATINGS 20
- CAPACITANCE 20
- DC CHARACTERISTICS 21
- AC CHARACTERISTICS 22
- ATA REGISTERS 27
- FEATURE REGISTER 28
- SECTOR COUNT REGISTER 29
- SECTOR NUMBER REGISTER 30
- CYLINDER LOW REGISTER 31
- CYLINDER HIGH REGISTER 32
- DRIVE/HEAD REGISTER 33
- STATUS REGISTER 34
- COMMAND REGISTER 35
- ALTERNATE STATUS REGISTER 36
- DEVICE CONTROL REGISTER 37
- DEVICE ADDRESS REGISTER 38
- ATA COMMAND SET 39
- SALES AND SUPPORT 75
- PART NUMBERING 75
- PART NUMBERS 76
- RELATED DOCUMENTATION 77
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