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10.38 Write Buffer (E8h)
The Write Buffer command enables the host to overwrite contents of the Card’s sector buffer with any data
pattern desired. This command has the same protocol as the Write Sector(s) command and transfers 512 Bytes.
Table 101 defines the Write Buffer command Byte sequence.
Table 101: Write Buffer
Task File Register
7
6
5
4
3
2
1
0
COMMAND
E8h
DRIVE/HEAD
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
D
nu
nu
nu
nu
nu
nu
10.39 Write DMA (CAh)
This command uses DMA mode to write 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. When
this command is issued the CompactFlash TM Storage Card sets BSY, puts all or part of the sector of data in the
buffer. The Card is then permitted, although not required, to set DRQ, clear BSY. The Card asserts DMAREQ while
data is available to be transferred. The host then writes the (512 * sector-count) bytes of data to the Card using
DMA. While DMAREQ is asserted by the Card, the Host asserts – DMACK while it is ready to transfer data by DMA and
asserts – IOWR once for each 16 bit word to be transferred from the Host.
Interrupts are not generated on every sector, but upon completion of the transfer of the entire number of sectors
to be transferred or upon the occurrence of an unrecoverable error. At command completion, the Command Block
Registers contain the cylinder, head and sector number of the last sector written. If an error occurs, the write
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 amount of data transferred is indeterminate.
When a Write DMA command is received by the Card and 8 bit transfer mode has been enabled by the Set
Features command, the Card shall return the Aborted error.
Table 102: Write DMA
Task File Register
7
6
5
4
3
2
1
0
COMMAND
CAh
DRIVE/HEAD
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
LBA
D
Cylinder High (LBA23:16)
Cylinder Low (LBA15:8)
Sector number (LBA7:0)
Sector Count
nu
Head (LBA 27:24)
10.40 Write DMA Ext (35h) 48bit LBA
This command uses DMA mode to write from 1 to 65536 sectors as specified in the Sector Count Register. A sector
count of 0 requests 65536 sectors. The transfer begins at the sector specified in the Sector Number Register. When
this command is issued the CompactFlash TM Storage Card sets BSY, puts all or part of the sector of data in the
buffer. The Card is then permitted, although not required, to set DRQ, clear BSY. The Card asserts DMARQ while
data is available to be transferred. The host then writes the (512 * sector-count) bytes of data to the Card using
the DMA protocol. While DMARQ is asserted by the Card, the Host asserts -DMACK while it is ready to transfer data
by DMA and asserts -IOWR once for each 16 bit word to be transferred from the Host.
Interrupts are not generated on every sector, but upon completion of the transfer of the entire number of sectors
to be transferred or upon the occurrence of an unrecoverable error.
At command completion, the Command Block Registers contain the LBA of the last sector written. If an error
occurs, the write terminates at the sector where the error occurred. The Command Block Registers contain the LBA
of the sector where the error occurred. The amount of data transferred is indeterminate.
When a Write DMA command is received by the Card and 8 bit transfer mode has been enabled by the Set
Features command, the Card shall return the Aborted error.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.00
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
C-440_data_sheet_CF-HxBU_Rev100.doc
Page 83 of 102
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