OneNAND512/OneNAND1GDDP
FLASH MEMORY
67
Technical Notes
(Continued)
Flash Core Array Selection for Unlock Operation
The LSB and MSB Flash Cores in a OneNAND DDP configuration power-up in a locked state and must be unlocked before opera-
tion. Set DFS and DBS = "0" to select the LSB Chip or "1" to select the MSB chip, then issue Unlock Command Sequence: Start block
address+End block address+Unlock block command (0023h).
Note that the LSB and MSB chips must each be unlocked. The default state for Device BufferRAM Select (DBS) and Device Flash
Core Select (DFS) = "0", which selects the LSB chip. For more information on lock operations.
DDP Chip Selection Operation
Flash Array is locked at Power up
Unlock
. LSB Chip Case
. MSB Chip Case
Set DBS=0 to select BufferRAM of LSB chip
Flash Array is locked at Power up
Unlock
Set DBS=1 to select BufferRAM of MSB chip
Set DFS=0 to select BufferRAM of LSB chip
Set DFS=1 to select BufferRAM of MSB chip
BufferRAM Selection for Read/Write Operation
The LSB and MSB chip BufferRAMs operate independently. Select the desired LSB or MSB chip and then execute a BufferRAM
Read/Write operation. The default state for Device BufferRAM Select (DBS) and Device Flash Core Select (DFS) = "0", which selects
the LSB chip.
For more information on read/write operations.
. LSB Chip Case
Set DBS=0 to select BufferRAM of LSB chip
Set DBS=1 to select BufferRAM of MSB chip
BufferRAM Read/Write
BufferRAM Read/Write
. MSB Chip Case
BufferRAM and Flash Core Selection for Load/Program/Erase/Copy-back/Cache Program/Write Protect Operation
The LSB and MSB chip BufferRAMs operate independently. Select the desired LSB or MSB chip and then execute a BufferRAM
Read/Write operation. The default state for Device BufferRAM Select (DBS) and Device Flash Core Select (DFS) = "0", which selects
the LSB chip.
For more information on read/write operations.
. LSB Chip Case
Set DBS=0 to select BufferRAM of LSB chip
Set DBS=1 to select BufferRAM of MSB chip
. MSB Chip Case
Set DFS=0 to select BufferRAM of LSB chip
Set DFS=1 to select BufferRAM of MSB chip
Load/Program/Erase/Copy-back
Cache Program/Write Protection Commands
Load/Program/Erase/Copy-back
Cache Program/Write Protection Commands