OneNAND512Mb(KFG1216U2B-xIB6)
FLASH MEMORY
Erase Resume
When the Erase Resume command is executed, the Block Erase will restart. The Erase Resume operation does not actually resume
the erase, but starts it again from the beginning.
When an Erase Suspend or Erase Resume command is executed, the addresses are in Don't Care state.
For Multi Block Erase, Erase suspend/Resume can be operated after final Erase command (0094h) is issued. Therefore, Erase
Resume operation does not actually resume from the erased block, but resumes the multi block erase from the beginning.
3.11
OTP Operation
One Block of the NAND Flash Array memory is reserved as a One-Time Programmable Block memory area.
Also, 1st Block of NAND Flash Array can be used as OTP.
The OTP block can be read, programmed and locked using the same operations as any other NAND Flash Array memory block.
OTP block cannot be erased.
OTP block is fully-guaranteed to be a valid block.
Entering the OTP Block
The OTP block is separately accessible from the rest of the NAND Flash Array by using the OTP Access command instead of the
Flash Block Address (FBA).
Exiting the OTP Block
To exit the OTP Access Mode, a Cold-, Warm-, Hot-, or NAND Flash Core Reset operation is performed.
Exiting the OTP Block during an Erase Operation
If the Reset-triggered exit from the OTP Access Mode happens during an Erase Suspend Operation, the erase
routine could fail. Therefore to exit from the OTP Access Mode without suspending the erase operation stop, a
'NAND Flash Core Reset' command should be issued.
The OTP Block Page Assignments
OTP area is one block size (128KB+4KB, 64 Pages) and is divided into two areas. The 50-page User Area is available as an OTP
storage area. The 14-page Manufacturer Area is programmed by the manufacturer prior to shipping the device to the user.
OTP Block Page Allocation Information
Area
User
Page
Use
0 ~ 49 (50 pages)
50 ~ 63 (14 pages)
Designated as user area
Used by the device manufacturer
Manufacturer
Three Possible OTP Lock Sequence (Refer to Chapter 3.11.3~3.11.5 for more information)
Since OTP Block and 1st Block OTP can be locked only by programming into 8th word of sector0, page0 of the spare memory area
of OTP, OTP Block and 1st Block OTP lock sequence is restricted into three following cases.
Note that user should be careful, because locking OTP Block before locking 1st Block OTP will disable locking 1st Block OTP.
1. OTP Block Lock Only :
Once the OTP Block is locked, 1st Block OTP Lock is impossible.
2. 1st Block OTP Lock, and then Lock OTP Block afterwards :
Locking 1st Block OTP does not lock the OTP block, so that OTP Block Lock can be performed thereafter.
3. OTP Block Lock and 1st Block OTP Lock simultaneously:
This simultaneous operation can be done by programming into 8th word of sector0, page0 of the spare memory area of OTP.
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