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T
S
3
2
M
~
1
G
C
F
8
0
T
S
3
2
M
~
1
G
C
F
8
0
T
S
3
2
M
~
1
G
C
F
8
0
80X CompactFlash Card
Errors encountered during Write Multiple commands are posted after the attempted writes of theblock 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 numbers of the sector where the error occurred. The
Sector Count Register contains the residual number of sectors that need to be transferred for successful completion of
the command, e.g., 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.
5.6.28 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.
5.6.29 Write Sector(s) - 30h or 31h
This command writes from 1 to 256 sectors as specified in the Sector Count Register. A sector count of zero requests 256
sectors. The transfer begins at the sector specified in the Sector Number Register. When this command is accepted, the
CompactFlash Storage Card sets BSY, then sets DRQ and clears BSY, then waits for the host to fill the sector buffer with
the data to be written. No interrupt is generated to start the first host transfer operation. No data should be transferred by
the host until BSY has been cleared by the host.
For multiple sectors, after the first sector of data is in the buffer, BSY shall be set and DRQ shall be cleared. After the next
buffer is ready for data, BSY is cleared, DRQ is set and an interrupt is generated. When the final sector of data is
transferred, BSY is set and DRQ is cleared. It shall remain in this state until the command is completed at which time BSY
is cleared and an interrupt is generated.
Transcend Information Inc.
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