km29w040ait Samsung Semiconductor, Inc., km29w040ait Datasheet - Page 10

• Manufacturer Part Number: km29w040ait
• Description: 512k X 8 Bit Nand Flash Memory
• Manufacturer: Samsung Semiconductor, Inc.

When the error occurs after an erase operation, prevent future accesses to this bad block
(again by creating a table within the system or other appropriate scheme.)
Block Replacement
During Program operation ;
During Erase operation ;
Error in program or erase operation
KM29W040AT, KM29W040AIT
KM29W040A Technical Notes(Continued)
The device may fail during a program or erase operation.
The following possible failure modes should be considered when implementing a highly reliable system.
Single Bit
Block
Frame
Buffer
memory
error occurs
Failure Mode
Program Failure
Program Failure
Erase Failure
("1" --> "0")
Block B
Block A
10
Read after Erase --> Block Replacement
Status Read after Program --> Block Replacement
Block Verify after Program --> Block Replacement
When the error happens in Block "A", try to reprogram the
data into another Block "B" by reloading from an external
buffer. Then, prevent further system access to Block
"A"(by creating a "bad block" table or other appropriate
scheme.)
Detection and Countermeasure sequence
FLASH MEMORY