Product category:
Memory Devices and Modules
News Release from: Fujitsu Microelectronics Europe
Edited by the Electronicstalk Editorial
Team on 19 February 2003
Big three agree on mobile memory
specifications
Fujitsu, NEC and Toshiba have reached agreement on common specifications for pseudo static random access memory (PSRAM) devices that feature burst mode function for fast access operation.
Fujitsu, NEC and Toshiba have reached agreement on common specifications for pseudo static random access memory (PSRAM) devices that feature burst mode function for fast access operation Each of the three companies will independently manufacture and market PSRAM products based on the common specifications, which are to be called "Common specifications for mobile RAM" (COSMORAM), with product introduction expected to begin in the first half of fiscal 2003
This article was originally published on Electronicstalk on 16 Feb 2001 at 8.00am (UK)
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In September 1998, the three firms promulgated common specifications for stacked multichip packages (MCPs) that include both Flash memory and SRAM.
Then in March 2002, the three companies agreed on common specifications for PSRAMs that feature page mode function, forming the basis for a common spec for the page mode PSRAM and stacked MCPs that include the PSRAM.
Defining user-interface specifications for high-speed, high-density PSRAMs resolved compatibility problems, thereby allowing customers to efficiently implement the PSRAM devices of all three firms.
The trio of companies has now expanded the agreement to include common specifications for a burst mode PSRAM user interface and the stacked MCPs that house the PSRAMs.
Burst mode function enables high-performance operation superior to fast page mode, making it ideally suited to respond to the high-speed processing needs of next-generation cell phones and other mobile equipment, such as PDAs.
Because the specifications for burst mode PSRAM, much like those adopted for page mode PSRAM, standardise the basic electrical properties, packaging and pin layout, customers will benefit from a uniform design format, eliminating the need to customise designs for each product.
This advantage will help shorten the design cycle and dramatically improve design efficiency.
In addition, since the three companies are using common specs, they can also act as alternative sources for each other, helping to ensure a stable market supply.
The COSMORAM specifications for burst mode PSRAM user interface cover: densities; supply voltage range; control pin names; truth table; partial refresh function (refresh size and corresponding base address assignment); burst mode function (burst length and corresponding addressing); mode register defaults; mode-register setting method; power-on sequence; pinouts; and packaging. Request free introductory details about products from Fujitsu Microelectronics Europe ...
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