29F0408 Ver la hoja de datos (PDF) - MAXWELL TECHNOLOGIES

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29F0408

32 Megabit (4M x 8-bit) flash memory

MAXWELL TECHNOLOGIES 

32 Megabit (4M x 8-Bit) Flash Memory

29F0408

block information and create the invalid block table via the following suggested flow chart (Figure 1). Any intentional

erasure of the original block information is prohibited.

FIGURE 1. FLOW CHART TO CREATE INVALID BLOCK TABLE

Error in write or read operation

Over its lifetime, the additional invalid blocks may occur. Through the tight process control and intensive testing, addi-

tional block failure rate is minimized which is projected below 0.1% until 1 million program/erase cycles. Refer to the

qualification report for the actual data. The following possible failure modes should be considered to implement a

highly reliable system. In the case of status read failure after erase or program, block replacement should be done. To

improve the efficiency of memory space, it is recommended that the read or verification failure due to single bit error

be reclaimed by ECC without any block replacement. The said additional block failure rate does not include those

reclaimed blocks.

Write

FAILURE MODE

Erase failure

Program failure

Read Single bit failure

DETECTION AND COUNTERMEASURE

Status read after erase Æ Block replacement

Status read after program Æ Block replacement

Read back (verify after program) Æ Block replacement or

ECC correction

Verify ECC Æ ECC correction

ECC: Error Correcting Code Æ Hamming Code, etc.

Example. 1-bit correction and 2-bit detection

11.08.02 Rev 2

All data sheets are subject to change without notice 8

©2002 Maxwell Technologies

All rights reserved.

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