【新聞】JEDEC暗示DDR-II將成為下一主流DRAM標準

**kanako0605** · 2002-04-09, 02:59 PM

首屆JEDEC會議上，JEDEC代表指出，DDR-400是否會成為繼DDR-300之後的下一主流，目前該組織正在猶豫中；而在DDR-333方面，之前已獲批准，成為目前市場上PC及其他產品的主流技術標準。JEDEC的代表更進一步暗示，"DDR-II"將取而代之(DDR-400)成為DDR-333之後的下一代DRAM標準，預計於今年將其制定為標準化，於2003年正式大量生產。在JEDEC的原始文章中指出，DDR-II共有兩種規格，400MHz 和 533MHz，使用的電壓為1.8V，封裝形式分為三種DIMMs、SODIMMs和MicroDIMMs。該組織亦正朝DDR-III方向發展中!!

以下為文章部分內容，資料來源：JEDEC

Now that the industry is comfortably launching volume productions of DDR SDRAM components with 200 and 266 megahertz data rates, and with the 333 megahertz speed grade sampling and getting ready for volume ramp in 2002, you would think that everyone could relax for a while. With module data throughput of 1600 megabytes per second for the DDR200 chips up to an astounding 2700 megabytes per second for DDR333 modules, the performance of today's DDRbased computing systems are impressive indeed. However, there is no rest for the weary. Processors seem to have an insatiable appetite for more bandwidth, so JEDEC has been busy on the development of ever higher speed grades of DDR for future systems.Generally called DDR II, this new generation of SDRAMs is highly compatible with the existing DDR generation of memories with a few new features to help drive data rates to 400 and 533 megahertz data rates per pin.These new features include a lower input/output signaling level,1.8V, to enable higher transfer speed through faster signal transition times, while at the same time reducing the operating power – the CV2f rules apply here! DDR II SDRAMs also include posted read and write options, further enhancing the performance of systems by offering high command bus utilization.The DDR400 speed grade offers 3200 megabyte per second peak throughput on PC3200 modules,which will be offered in 5.25 inch dual in-line memory modules (DIMMs), small outline (SODIMMs),and miniature form factor (MicroDIMMs). Even higher performance, the DDR533 speed grade, yields 4300 megabytes per second in a module.DDR II SDRAMs are expected to sample in 2002 with volume production to begin in 2003. So do you think we can rest now? Of course not… development has already begun on