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Disk errors encountered during Read Multiple commands are posted at the beginning of the block or partial
block transfer, but DRQ is still set and the data transfer will take place as it normally would, including transfer
of corrupted data, if any.
Interrupts are generated when DRQ is set at the beginning of each block or partial block. The error reporting is
the same as that on a Read Sector(s) Command. This command reads from 1 to 256 sectors as specified in the
Sector Count register. A sector count of 0 requests 256 sectors. The transfer begins at the sector specified in the
Sector Number Register.
If an error occurs, the read terminates at the sector where the error occurred. The Command Block Registers
contain the cylinder, head and sector number of the sector where the error occurred. The flawed data are
pending in the sector buffer.
Subsequent blocks or partial blocks are transferred only if the error was a correctable data error. All other errors
cause the command to stop after transfer of the block which contained the error.
Table 27 defines the Read Multiple command Byte sequence.
Table 27: Read Multiple
Task File Register
7
6
5
4
3
2
1
0
COMMAND
C4h
DRIVE/HEAD
1
LBA
1
D
Head (LBA 27-24)
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
Cylinder High (LBA23-16)
Cylinder Low (LBA15-8)
Sector Number (LBA7-0)
Sector Count
nu
6.12 Read Native max address (F8h)
The Read Native max address command reads the max native address of the drive. It is related to the Host
protected Area feature set. Table 28 defines the Read max native address command Byte sequence.
Table 28: Read native max address
Task File Register
7
6
5
4
3
2
1
0
COMMAND
F8h
DRIVE/HEAD
nu
LBA
nu
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
nu
nu
nu
nu
The LBA bit shall be set to one to specify the address is an LBA. DEV shall specify the selected device.
The native drive size is given in Drive/Head, Cyl Hi, Cyl Low and Sector num register as LBA value.
Swissbit AG
Industriestrasse 4-8
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.2
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
X-200_data_sheet_SA-QxBR_Rev12.doc
Page 22 of 47
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