SanDisk SDP3B - Write Verify Sector(S) - 3 CH

SDP3B FlashDisk Product Manual
SanDisk SDP3B FlashDisk Product Manual © 1998 SANDISK CORPORATION 79
overall performance of the combined Erase
Sector(s) command along with the Write Sector(s)
without Erase command is less than the normal
Write Sector(s) command but has the advantage
of splitting up the overall time so the write only
portion is more than two times the transfer rate of
the normal Write Sector(s) command. Refer to
section 1.7.5 Using the Erase Sector and Write
without Erase Commands for an expanded
definition of these commands.
6.1.30 Write Verify Sector(s) - 3CH
Bit -> 7 6 5 4 3 2 1 0
Command (7) 3CH
C/D/H (6) 1 LBA 1 Drive Head (LBA 27-24)
Cyl High (5) Cylinder High (LBA 23-16)
Cyl Low (4) Cylinder Low (LBA 15-8)
Sec Num (3) Sector Number (LBA 7-0)
Sec Cnt (2) Sector Count
Feature (1) X
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
SDP3B FlashDisk 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 buffer fill
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 will be set and DRQ will 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 will
remain in this state until the command is
completed at which time BSY is cleared and an
interrupt is generated.
If an error occurs during a write of more than one
sector, writing terminates at the sector where the
error occurs. The Command Block Registers contain
the cylinder, head and sector number of the sector
where the error occurred. The host may then read
the command block to determine what error has
occurred, and on which sector.