4256BWP datasheet(18/41 Pages) STMICROELECTRONICS

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Instructions

M24256-BW M24256-BR M24256-BF M24256-DR M24256-DF

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Doc ID 6757 Rev 28

5.1.5

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(a). 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). 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 byte0, byte1, byte2 and byte3 of the same group must remain

below the maximum value defined Table 11: Cycling performance by groups of four bytes.

a. 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.

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