High-Performance Graphic Memory

Takeshi Kizaki, Semiconductor & Integrated Circuits Division, Hitachi, Ltd.
Yozo Saiki, Electron Tube & Devices Division, Hitachi, Ltd.
Kazumasa Yanagisawa, Semiconductor & Integrated Circuits Division, Hitachi, Ltd.
Takao Watanabe, Central Research Laboratory, Hitachi, Ltd.
Ryo Fujita, Hitachi Research Laboratory, Hitachi, Ltd.


The new market fusing graphics and communication such as Internet and video on demand is now expanding. Communication is no doubt the triggering technology. The development of graphics technology, such as compression and decompression techniques, is also important in a supporting role.

The final goal of graphics processing is a natural picture (three-dimensional movie), and technology is being developed towards this.

Hitachi has been developing video random-access memory (VRAM), extended data out dynamic RAM (EDO DRAM), and synchronous DRAM (SDRAM) as graphics memory. Now synchronous graphic RAM (SGRAM), which was developed based on SDRAM, has a faster access time and added special graphic functions and is in production.

For higher performance requirements such as next generation ultra high speed graphics applications, combined DRAM/logic LSI circuit are under development.

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