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MoSys 1T - SRAM Unveiled

by Billy Berghammer - September 3, 1999, 5:02 pm EDT
Source: EE Times

Nintendo has announced their plans for global domination. Their secret weapon? 1T-SRAM by MoSys.

Thanks to Justin for the story over at EE times. So what the hell is it? Here's the junk...

LONDON - So-called one-transistor SRAM technology developed by MoSys Inc. (Sunnyvale, Calif.) has gained a high-profile design win. It will be used by Nintendo Co. Ltd. (Kyoto, Japan) in its Dolphin game console, due to debut in fall 2000.

At a consumer electronics and PC games exhibition here next week, Nintendo is to announce that it has licensed the 1T-SRAM technology from MoSys for use by ArtX Inc. (Palo Alto, Calif.) in a graphics processor being developed for the Dolphin. NEC Corp. will fabricate the chip using a 0.18-micron embedded-DRAM process.

"This is a breakthrough for us-the first application in high-volume graphics to use SRAM rather than embedded DRAM,"said Mark Jones, vice president and general manager of intellectual property at MoSys.

MoSys has already announced licensing agreements with chip makers TSMC, NEC and Analog Devices Inc., and Jones said other deals are in the pipeline.

It has not yet been revealed how much embedded memory ArtX will put on its Nintendo graphics processor, but MoSys claims that up to 128 Mbits of 1T-SRAM can be embedded in logic devices.

The MoSys memory cell has the same fundamental structure as a DRAM. It requires refresh and makes use of the same basic single-transistor-plus-capacitor structure as a DRAM cell.

Transparent refresh

But "to the users it looks like SRAM," Jones said. "What MoSys has done is create an SRAM-compatible cell block. Users don't see the refresh, and we can achieve SRAM access speed. What is more, you can build the 1T-SRAM in a standard CMOS process, which you can't dowith DRAM."

Some graphics-chip developers are eyeing embedded DRAM to improve bandwidth between the processing pipeline and memory, but Jones said they are stuck with DRAMs' relatively slow random-access times. The embedding of large SRAM blocks into a graphics processor should improve performance, resulting in more detailed graphics moving at higher frame rates.

Meawhile, Nintendo Co. Ltd. said in Tokyo it will use ARM's 32-bit RISC core to power its next-generation portable game pad, Game Boy Advance, which will hit the Japanese market in August 2000. The company intends to propose a game world to be built on the communications capability of Game Boy Advance, which will offer performance comparable to current game consoles. Sharp Corp., which is supplying color LCDs for the current Game Boy Color, will again be the component supplier for the next generation.

Nintendo plans to offer a communications adapter in April 2000 for Game Boy Color, the color version of current Game Boy. Linking the current Game Boy Color with a portable phone will enable users to play communications games on Game Boy. In August next year, Nintendo will introduce Game Boy Advance in Japan to provide stronger communications and Internet connectability through the adapter.

Hiroshi Yamauchi, president of Nintendo, said, "The Japanese portable phone market is expected to reach 50 million units by the end of the year. The rapid increase of users will be a rich soil for a new communications-game software market to grow."

He drew a line between current network games and communications games. He said that Nintendo intends to create a new game arena but would not disclose details.

Game Boy Advance marks the first time a portable game pad has been powered by a 32-bit RISC CPU.

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