Samsung FLEX-MUXONENAND KFN8GH6Q4M - Manual (Page 92)

Flex-MuxOneNAND4G(KFM4GH6Q4M-DEBx)
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FLASH MEMORY
Flex-MuxOneNAND8G(KFN8GH6Q4M-DEBx)
Flex-MuxOneNAND16G(KFKAGH6Q4M-DEBx)
3.13 OTP Operation (SLC only)
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.
OTP area and 1st block OTP area must be utilized as a SLC block.
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. Note that Cache program and Finish Cache program cannot be performed on OTP and 1st Block OTP area.
OTP block is fully-guaranteed to be a valid block by an internal ECC engine.
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, a
'NAND Flash Core Reset' command should be issued.
The OTP Block Page Assignment
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
Three Possible OTP Lock Sequence (Refer to Chapter 3.13.3~3.13.5 for more information)
Since OTP Block and 1st Block OTP can be locked only by programming into 1st word of sector4, page49 of the main 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 Only:
Locking 1st Block OTP does not lock the OTP block, but the OTP Block Lock cannot be performed thereafter.
3. OTP Block Lock and 1st Block OTP Lock simultaneously:
This simultaneous operation can be done by programming into 1st word of sector4, page49 of the main memory area of OTP.
Area Page Use
User 0 ~ 49 (50 pages) Designated as user area
Manufacturer 50 ~ 63 (14 pages) Used by the device manufacturer