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Akira YAMAZAKI Takeshi FUJINO Kazunari INOUE Isamu HAYASHI Hideyuki NODA Naoya WATANABE Fukashi MORISHITA Katsumi DOSAKA Yoshikazu MOROOKA Shinya SOEDA Kazutami ARIMOTO Setsuo WAKE Kazuyasu FUJISHIMA Hideyuki OZAKI
A 23.3 mm2 32 Mb embedded DRAM (eDRAM) macro has been fabricated using 0.18 µm triple-well 4-metal embedded DRAM process technology to realize an accelerated 3-D graphics controller. The array architecture, using a dual-port sense amplifier, achieves the column access latency of two cycles at 222 MHz and a peak data rate of 14.2 4 GB/s at 4 macros. The process cost has been kept low by using VT-MOS circuit technology and taking advantage of a characteristic of dual-gate oxide process technology. A tRAC of 11.6 ns at 2.0 V is achieved using a 'pre-detect redundancy' circuit.