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Japanese trio ink COSMORAM Rev. 4

Posted: 20 Feb 2006     Print Version  Bookmark and Share

Keywords:COSMORAM  Common Specifications for Mobile RAM  PSRAM  Toshiba  NEC Electronics 

Toshiba Corp., NEC Electronics Corp. and Fujitsu Ltd have announced that they have reached an agreement on standard interface specifications known as COSMORAM (Common Specifications for Mobile RAM) Rev. 4, for PSRAM 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 starting March 2007.

The three companies first created common specifications in September 1998 for stacked multi-chip packages that include both flash memory and SRAM. In March 2002, the companies jointly announced COSMORAM Rev. One 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, these three companies share common interface specifications for PSRAM, which is said to enable higher speeds and higher densities.

The COSMORAM Rev. 4 is a specification for PSRAM with double data rate burst (DDR burst) mode, which enables up to twice the previous data transfer rates. DDR burst mode is said to enable an increase in data read/write performance by achieving twice the peak data bandwidth of conventional products. In addition, the short latency mode claims to improve effective bandwidth.

The areas standardized under COSMORAM Rev. 4 include DDR burst mode, short latency mode, capacity, voltage range, control pin names and functions, truth table, mode register setting method and AC timing specifications.

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