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6.31 Write Multiple Command (C5h)
This command is similar to the Write Sectors command. The Drive sets BSY within 400ns of accepting the
command. Interrupts are not presented on each sector but on the transfer of a block which contains the
number of sectors defined by Set Multiple. Command execution is identical to the Write Sectors operation except
that the number of sectors defined by the 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 Write Multiple command.
When the Write 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
sector/block, 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 Write Multiple command is attempted before the Set Multiple Mode command has been executed or when
Write Multiple commands are disabled, the Write Multiple operation will be rejected with an aborted command
error.
Errors encountered during Write Multiple commands are posted after the attempted writes of the block or partial
block transferred. The Write command ends with the sector in error, even if it is in the middle of a block.
Subsequent blocks are not transferred in the event of an error. Interrupts are generated when DRQ is set at the
beginning of each block or partial block.
The Command Block Registers contain the cylinder, head and sector number of the sector where the error
occurred and the Sector Count Register contains the residual number of sectors that need to be transferred for
successful completion of the command. For example, each block has 4 sectors, a request for 8 sectors is issued
and an error occurs on the third sector. The Sector Count Register contains 6 and the address is that of the third
sector.
Note: The current revision of the Drive only supports a block count of 1 as indicated in the Identify Drive
Command information. The Write Multiple command is provided for compatibility with future products which
may support a larger block count.
Table 55 defines the Write Multiple command Byte sequence.
Table 55: Write Multiple
Task File Register
7
6
5
4
3
2
1
0
COMMAND
C5h
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
6.32 Write Multiple without Erase (CDh)
This command is similar to the Write Multiple command with the exception that an implied erase before write
operation is not performed. The sectors should be pre-erased with the Erase Sector(s) command before this
command is issued. Table 56 defines the Write Multiple without Erase command Byte sequence.
Table 56: Write Multiple without Erase
Task File Register
7
6
5
4
3
2
1
0
COMMAND
CDh
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
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.41
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
F-100_data_sheet_CA-HxBR_Rev141.doc
Page 35 of 51
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