In order to fulfill the serial presence detect (SPD) function used in high-speed memory modules conforming to the JEDEC specifications, the M34E02/E04 (2 and 4-Kbit I²C serial EEPROM) can store all configuration parameters of the DRAM module. The set temporary write protection, reset temporary write protection, set permanent write protection and hardware write control are special features acting as protection for the first half of the memory.