AN2440

Conclusion

Doc ID 023074 Rev 4

11/13

5

Conclusion

When an EEPROM device embeds an ECCx4 function, the device operates on a word-by-

word basis, while an EEPROM device without ECCx4 operates on a byte-by-byte basis.

For the EEPROM devices embedding an ECCx4 function:

1.

Read reliability is improved as a 1-bit error (within 4 bytes) can be detected and

corrected.

2.

Each byte can be independently cycled, provided that the cycling budget for the

associated word does not exceed the cycling performance defined in the datasheet.

3.

If the supply voltage (VCC) drops during the internal write cycle, the four bytes of the

word might be incorrectly written. As a consequence, read-only parameter bytes must

not share the same word as the read/write parameter bytes.