The HB54A1288KM is a 16M x 64 x 1 bank Double Data Rate (DDR) SDRAM Module, mounted 4 pieces of 256Mbits DDR SDRAM (HM5425161BTT) sealed in TSOP package and 1 piece of serial EEPROM (2k bits EEPROM) for Presence Detect (PD). Read and write operations are performed at the cross points of the CK and the /CK. This high-speed data transfer is realized by the 2-bit prefetch-pipelined architecture. Data