据ISSCC’97报道，日本NEC公司采用多值技术开发了4GbDRAM。采用这一技术从纯计算角度来看，预计可缩小芯片面积50％，可提高成品率，可大大降低芯片成本。多值技术虽在快闪存储器中曾使用过，但用于DRAM尚属首次。多值技术是在存储资料中设置中间状态，进行复数值存储。这次开 According to ISSCC’97 reports, Japan’s NEC has developed multi-value technology 4GbDRAM. Using this technology from a purely computational point of view, the chip area is expected to be reduced by 50%, can improve the yield, can greatly reduce the cost of the chip. Although multi-valued technology has been used in flash memory, but for the first time for the DRAM. Multi-valued technology is to set the intermediate state in the stored data for complex value storage. This time