Toshiba, NEC Electronics and Fujitsu Announce Agreement on "COSMORAM Rev. 4" Common Pseudo SRAM Specifications for Mobile Devices
Tokyo, February 15, 2006 — Toshiba Corporation, NEC Electronics Corporation, and Fujitsu Limited today announced that they have reached an agreement on standard interface specifications known as COSMORAM (COmmon Specifications for MObile RAM) Rev. 4, for Pseudo Static Random Access Memory (PSRAM)(1) for use in mobile devices. Based on these specifications, each of the three companies will independently begin production and sales of PSRAM devices, with products scheduled to be available from each company from March 2007.
The three companies first created common specifications in September 1998 for stacked multi-chip packages (MCPs) that include both Flash memory and SRAM. In March 2002 the companies jointly announced COSMORAM Rev. 1 with page mode specification for PSRAM, followed by the announcement of the addition of burst mode specification for PSRAM in February 2003 (Rev. 2), and additional specifications for burst mode PSRAM in September 2004 (Rev. 3). As a result of these agreements, the three companies share common interface specifications for PSRAM, which easily enables higher speeds and higher densities, and eliminates the need for customers to be concerned for compatibilities among the three companies’ PSRAMs.
The new COSMORAM Rev. 4 is a specification for PSRAM with double data rate burst (DDR burst)(2) mode, which enables up to twice the previous data transfer rates. DDR burst mode enables a tremendous leap in data read/write performance by achieving twice the peak data bandwidth of conventional products. In addition, the short latency mode, which cuts initial access time to roughly half that of conventional products, improves effective bandwidth. These functions are optimal for mobile phones and mobile information terminals, which require ever-increasing levels of high-speed processing.
As with past COSMORAM specifications for PSRAM, customers can continue to standardize design formats, eliminating the need to customize product designs, thereby helping to shorten the design cycle and dramatically improving design efficiency. In addition, since the three companies are using common specifications, they can act as alternative sources for each other, helping to ensure a stable market supply of PSRAMs.
The major areas standardized under COSMORAM Rev. 4 include the following:
Double Data Rate Burst Mode(2)
Short Latency Mode
Control Pin Names And Functions
Mode Register(4) Setting Method
AC Timing Specifications
Pseudo SRAM (PSRAM): An SRAM compatible memory that uses a DRAM cell array for high densities and low bit cost, and that can self-regulate the refresh operations necessary for data memory storage in its internal memory components.
Double Data Rate: A method that executes two data transfers per clock cycle synchronizing with two clock signals.
Truth Table: A table defining how a device’s operations mode correlates to the external signals used to set that mode.
Mode Register: An internal register that stores the control code used to govern the device’s operating mode, set externally.
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