KM29W040AT 参数 Datasheet PDF下载

KM29W040AT, KM29W040AIT

KM29W040A Technical Notes(Continued)

Error in program or erase operation

FLASH MEMORY

The device may fail during a program or erase operation.

The following possible failure modes should be considered when implementing a highly reliable system.

Failure Mode

Block

Frame

Single Bit

Erase Failure

Program Failure

Program Failure

("1" --> "0")

Detection and Countermeasure sequence

Read after Erase --> Block Replacement

Status Read after Program --> Block Replacement

Block Verify after Program --> Block Replacement

Block Replacement

During Program operation ;

Buffer

memory

error occurs

When the error happens in Block "A", try to reprogram the

data into another Block "B" by reloading from an external

Block A

buffer. Then, prevent further system access to Block

"A"(by creating a "bad block" table or other appropriate

scheme.)

Block B

During Erase operation ;

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.)

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