M95640-W M95640-R M95640-DF
Instructions
6.6.1
Cycling with Error Correction Code (ECC)
M95640-x and M95640-Dx devices identified by the process letter K offer an Error
Correction Code (ECC) logic. The ECC is an internal logic function which is transparent for
the SPI communication protocol.
(c)
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
(c)
other bytes located in the same group . As a consequence, the maximum cycling budget is
defined at group level and the cycling can be distributed over the four 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 in Table 14.
c. 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.
Doc ID 16877 Rev 16
25/47
STMICROELECTRONICS [ ST ]
