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Memory subsystems combine NAND, NOR flash

Posted: 20 Jan 2006     Print Version  Bookmark and Share

Keywords:Spansion  NAND flash memory  MirrorBit  ORNAND  NOR 

Spansion Inc. entered the NAND flash memory portion of the cellphone market through a family of memory subsystems that integrate 90nm MirrorBit ORNAND flash memory with its NOR flash devices.

MirrorBit ORNAND is an architecture created by Spansion. It is based on a NAND interface, can drop into traditional NAND sockets, and combines key attributes of NOR for code storage and NAND for data storage, according to Jeremy Werner, solutions delivery marketing manager, wireless systems division at Spansion, by combining MirrorBit NOR devices for code execution and MirrorBit ORNAND for data storage, Spansion can deliver memory subsystems for a range of phones that enable DVD-quality video, CD-quality audio and up to five Megapixel photos on wireless handsets.

"ORNAND is an architecture that is built on MirrorBit technology. It has faster read capability than NAND that will allow faster boot times and loading of applications, and faster write-times than traditional NOR to enable higher-end video capture or higher resolution storage," he said. "ORNAND also has the added benefit of NOR-type reliability—it does not require error correction coding like traditional NAND parts do."

The MS-P is the first product family based on the ORNAND architecture. The first product is a 1.8V, 1Gb MirrorBit ORNAND MS device that is tailored for data storage in wireless handsets.

The devices will be housed in multi-chip packages (MCPs) and package-on-packages (POP), which will be done through a strategic partnership with Elpida Memory Inc., Tokyo. Spansion plans to deliver memory subsystems that can provide up to three Gbits of scalable code and data.

In conjunction with its MirrorBit NOR XIP product, the 1-Gbit ORNAND device offers a 54 per cent faster boot time than NAND devices, Werner said. The 1-Gbit ORNAND measures 82mm2 compared with between 80mm2 and 90mm2 of 1Gb NAND parts, he said.

Spansion has also launched its highest-performing MirrorBit NOR flash memory device, a 512Mb, 90mn product designed for up to 133MHz when operating in 1.8V wireless systems. The 90nm, 512Mb MirrorBit devices can be stacked into multiple die stacks to achieve a higher density. This ability, the high density and small die size make the devices suitable for a single NOR bus architecture.

Samples of the 90nm MirrorBit 512Mb devices are already available, with production planned for the middle of 2006.

- Ismini Scouras

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