Power supply vdd12v typical vddq 12v typical vpp 25v typical vddspd22v to 36v nominal and dynamic on die termination odt for data strobe and mask signals low power auto self refresh lpasr data bus inversion dbi for data bus on die vrefdq generation and calibration dual rank on board i2 serial presence detect spd eeprom 16 internal banks 4 groups of 4 banks each fixed burst chop bc of 4 and burst length bl of 8 via the mode register set mrs selectable bc4 or bl8 on the fly otf