m24m01-r STMicroelectronics, m24m01-r Datasheet - Page 16

• Manufacturer Part Number: m24m01-r
• Description: 1 Mbit Serial I?c Bus Eeprom
• Manufacturer: STMicroelectronics

Device operation
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Figure 8.
ECC (error correction code) and Write cycling
The M24M01-R device offers an ECC (error correction code) logic which compares each 4-
byte word with its six associated EEPROM ECC bits. As a result, if a single bit out of 4 bytes
of data happens to be erroneous during a Read operation, the ECC detects it and replaces
it by the correct value. The read reliability is therefore much improved by the use of this
feature.
Note however that even if a single byte has to be written, 4 bytes are internally modified
(plus the ECC word), that is, the addressed byte is cycled together with the three other bytes
making up the word. It is therefore recommended to write by packets of 4 bytes in order to
benefit from the larger amount of Write cycles.
The M24M01-R device is qualified at 1 million (1 000 000) Write cycles, using a cycling
routine that writes to the device by multiples of 4-byte words.
WC
Byte Write
WC
Page Write
WC (cont'd)
Page Write (cont'd)
Write mode sequences with WC = 0 (data write enabled)
ACK
Dev sel
Dev sel
Data in N
R/W
R/W
ACK
ACK
ACK
Byte addr
Byte addr
ACK
ACK
Byte addr
Byte addr
ACK
ACK
Data in 1
Data in
ACK
ACK
AI01106d
Data in 2
M24M01-R