M24256E-FDW6TP datasheet(15/46 Pages) STMICROELECTRONICS

Part #	M24256E-FDW6TP

Description	256-Kbit serial I²C bus EEPROM with configurable device address and preprogrammed device address

PDF	46 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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15 / 46 page

6.1.3

ECC (error correction code) and write cycling

The error correction code (ECC) is an internal logic function which is transparent for the I2C communication

protocol.

The ECC logic is implemented on each group of four EEPROM bytes. Inside a group, if a single bit out of the four

bytes happens to be erroneous during a read operation, the ECC detects this bit and replaces it with the correct

value. The read reliability is therefore much improved.

Even if the ECC function is performed on groups of four bytes, a single byte can be written/cycled independently.

In this case, the ECC function also writes/cycles the three other bytes located in the same group (a group of four

bytes is located at addresses [4*N, 4*N+1, 4*N+2, 4*N+3], where N is an integer.)

As a consequence, the maximum cycling budget is defined at group level and the cycling can be distributed over

the 4 bytes of the group: the sum of the cycles seen by byte 0, byte 1, byte 2 and byte 3 of the same group must

remain below the maximum value defined in Table 12.

M24256E-F

Write operations on memory array

DS12687 - Rev 3

page 15/46

M24256E-FDW6TP Datasheet(PDF) 15 Page - STMicroelectronics