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Table 70: Read DMA
Task File Register
7
6
5
4
3
2
1
0
COMMAND
C8h
DRIVE/HEAD
LBA
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
10.13 Read Multiple (C4h)
The Read Multiple command performs similarly to the Read Sectors command. Interrupts are not generated on
every sector, but on the transfer of a block which contains the number of sectors defined by a Set Multiple
command.
Command execution is identical to the Read Sectors operation except that the number of sectors defined by a Set
Multiple command is transferred without intervening interrupts. DRQ qualification of the transfer is required only
at the start of the data block, not on each sector.
The block count of sectors to be transferred without intervening interrupts is programmed by the Set Multiple
Mode command, which must be executed prior to the Read Multiple command. When the Read Multiple
command is issued, the Sector Count Register contains the number of sectors (not the number of blocks or the
block count) requested. If the number of requested sectors is not evenly divisible by the block count, as many full
blocks as possible are transferred, followed by a final, partial block transfer. The partial block transfer is for n
sectors, where:
n = (sector count) module (block count).
If the Read Multiple command is attempted before the Set Multiple Mode command has been executed or when
Read Multiple commands are disabled, the Read Multiple operation is rejected with an Aborted Command error.
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 71: 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
10.14 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 72 defines the Read max native address command Byte sequence.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.20
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
C-320_data_sheet_CF-HxBO_Rev120.doc
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