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Topic: DDR SDRAM

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SDR SDRAM

SDRAM

RDRAM

Dynamic random access memory

Rambus

DIMM

NRAM

DDR

Static random access memory

Random access memory

Computer storage

BGA

Dance Dance Revolution

JEDEC

Graphics processing unit

	Introduction to DDR SDRAM
		Released earlier this year, DDR appears to be fulfilling most of its developers promises as far as the speed to cost ratio.
		DDR derives its name from its functional characteristic of using the rising and falling edge of the memory bus clock for timing.
		DDR, like SDRAM, has inherent Latencies (or wait cycles) when the processor is not reading or writing data to the memory bus.
	www.dewassoc.com /performance/memory/ddr_intro.htm (611 words)

	DDR SDRAM - Wikipedia, the free encyclopedia
		DDR SDRAM or double-data-rate synchronous dynamic random access memory is a type of memory integrated circuit used in computers.
		DDR operates at a voltage of 2.5 V, compared to 3.3 V for SDR SDRAM.
		DDR is now replaced by DDR2 SDRAM, which has some modifications to allow higher clock frequency, but operates on the same principle as DDR.
	en.wikipedia.org /wiki/DDR_SDRAM (1028 words)

	DDR SDRAM memory: DDR memory or rambus memory
		DDR memory is the newest technology offered by the IT industry in memory and promises to rival the processing speeds of RDRAM or also know as Rambus technology memory.
		DDR memory does not promise to wipe out SDRAM memory instantly, so go ahead and buy SDRAM memory while the price is low and it is readily available.
		DDR memory and SDRAM memory are alike except for the fact that DDR memory reads data on both the rising and falling edges of the system's clock signal.
	www.baber.com /coop/ts/ddr_memory_modules.htm (609 words)

	T h e D D R Z o n e =>> DDR FAQ (Site not responding. Last check: 2007-10-23)
		DDR memory is clocked at the same speed as normal SDRAM (ie 100, 133mhz), The big difference between DDR and SDRAM memory is that DDR can transport double the amount of data it reads by utilizing both the rising and falling edges of the clock signal.
		DDR DIMMs currently support memory bus speeds of either 100 or 133MHz, with a faster memory bus speed of 166mhz reviewed by JEDEC and released by many of the leading memory manufacturers early in 2002.
		DDR specifies a CL of 2.5 or 2.
	www.theddrzone.com /faq.php (2575 words)

	ITworld.com - Memory makers ready to ramp DDR SDRAM
		DDR SDRAM is touted by many memory suppliers as a more cost-efficient alternative to RDRAM (Rambus DRAM), a competing high-speed memory technology developed by Los Altos, California-based Rambus Inc. and backed mainly by processor giant Intel Corp.
		One of the most aggressive backers of DDR SDRAM is Micron Technology Inc., and the company is dedicated to closing the pricing gap sooner rather than later, said Jeff Mailloux, director of DRAM marketing at the Boise, Idaho-based company.
		Nevertheless, by as early as mid-year, 128M bytes of DDR SDRAM could be found even in low-end US$599 desktop PCs, even if the price of such memory modules is still as high as $100, predicted Hyundai's Tabrizi.
	www.itworld.com /Comp/1946/ITW_2-7-01_ddrsdram/pfindex.html (476 words)

	DDR SDRAM Will Make Debut In Graphics Arena - Technology News by TechWeb
		Companies such as Micron, Hitachi, and Samsung are gearing up their DDR graphics programs months before the double-clocked interface is expected to arrive as main memory in desktop PCsand servers.
		Iwanyc said that in many ways DDR is well suited as buffer memory in graphics chip sets, particularly because of its wide, 64-bit organization; high speed; and relatively low cost.
		As frame-buffer memory, DDR would also sidestep many of the timing and interface issues associated with main memory, because the frame buffer communicates directly with the graphics processor without the need for an intervening core-logic chip set.
	www.techweb.com /wire/story/TWB19990603S0021 (585 words)

	Faster, cheaper memory on the horizon \| CNET News.com
		DDR DRAM has one major factor working in its favor: Because it is a derivative of current computer memory, most manufacturers and computer designers should be able to incorporate DDR DRAM chips fairly easily.
		DDR is essentially a version of computer memory called SDRAM, but it processes data twice as fast.
		DDR runs at the same speed, but because it can cycle through twice the amount of data in the same period of time, it effectively functions at 200 MHz or 266 MHz.
	news.com.com /2100-1001-236256.html (957 words)

	DDR/SDR SDRAM (Site not responding. Last check: 2007-10-23)
		A key feature of SDRAM is its ability to increase the overall system performance of the system by reducing the time in executing commands and transmitting data.
		SDRAM includes an on-chip burst counter that can be used to increment column addresses for very fast burst accesses.
		SDRAMs are the de-facto standard and are extensively used in a wide range of networking applications.
	www.xilinx.com /esp/wired/optical/xlnx_net/sdram.htm (328 words)

	What is PC2700 DDR SDRAM ?
		DDR also known as Double Data Rate SDRAM memory technology is a revolutionary new technology derived from the mature SDRAM technology.
		The secrets behind DDR memory high performance architecture is its capability to perform two data read/write operations in one clock cycle — therefore providing twice the throughput of SDRAM.
		DDR memory currently supports memory bus speeds of either 100MHz or 133MHz, equivalent to Data Rate of 200 and 266Mhz respectively.
	www.simmtester.com /page/news/showpubnews.asp?num=80 (808 words)

	DDR SDRAM Controller
		The DDR SDRAM uses double data rate architecture to achieve high-speed data transfers.
		DDR SDRAM (referred to as DDR) transfers data on both the rising and falling edge of the clock.
		This DDR controller is typically implemented in a system between the DDR and the bus master.
	www.latticesemi.com /products/intellectualproperty/referencedesigns/ddrsdramcontroller.cfm (185 words)

	Eureka Technology - DDR SDRAM Controller IP core
		The EP530 DDR SDRAM Controller is an IP core that interface between multiple DDR SDRAM devices and a memory requestor such as a processor or DMA device.
		The SDRAM timing, such as row and column latency, precharge timing, and row access length, are programmed to their default values at system reset.
		Data between the DDR core and the DDR SDRAM is transferred at both the rising edge and falling edge of the clock input.
	www.eurekatech.com /products/memory/ep530.htm (519 words)

	MSI DDR Total Solution
		The big difference between DDR and SDRAM memory is that DDR reads data on both the rising and falling edges of the clock signal.
		DDR memory technology is an evolutionary improvement of mature PC133 SDRAM technology.
		DDR memory was selected because of its increased performance as well as its low-cost premium over SDRAM, since DDR can easily be manufactured by existing semiconductor fabrication plants and can be built and tested without significant capital investments.
	www.msicomputer.com /Newsrelease/msiddr.htm (330 words)

	SDRAM, DDR and Rambus Memory
		Indeed, DDR SDRAM and Rambus DRAM are the new kids on the block when it comes to memory development.
		SDRAM and the system bus execute instructions at the same time rather than one of them having to wait for the other to perform their function.
		Shortly thereafter, DDR SDRAM emerged, and its proponents said that DDR was the true king of the hill.
	www.dewassoc.com /performance/memory/ddr_sdram.htm (1371 words)

	How to identify different sizes of computer memory RAM? DDR SDRAM MEMORY
		There are eight chips, so this is a 16MB SDRAM module, which is slow compared to the fastest speed that SDRAM modules reached.
		Ordinary SDRAM comes in types that run at official speeds of 66, 100, and 133MHz, i.e., usually at the same speed as the default Front Sided Bus (FSB) speed of the motherboard.
		DDR SDRAM uses a new technique to transfer data that effectively doubles its speed.
	www.ddrsdrammemory.com /identifying_size_of_ram.html (1577 words)

	Sdram Or Ddr? - FileSharing Talk
		DDR is much faster and can handle larger sizes.
		SDRAM and RDRAM, for consumer use, is going bye bye.
		ddr (as against sdram) may not double your computer's speed but certainly there will be a big difference in performance.
	filesharingtalk.com /vb3/hardware/t-sdram-ddr-7761 (803 words)

	X-bit labs - DDR SDRAM. Memory of the Near Future
		As for DIMM DDR SDRAM memory modules, the situation is a bit different: nobody seems to really need them now, becausethey require special mainboards built on the chipsets supporting this memory type.
		Besides, we can't help mentioning the server solutions with DDR SDRAM supprot, which are most likely to appear by the endof the year, because some manufacturers are known to be currently developing solutions like that.
		DDR SDRAM DIMM modules standard implies using up to 200MHz chips providing 400MHzend frequency and the bandwidth of 3.2GB/sec as we saw by dual-pipeline Direct Rambus DRAM.
	www.xbitlabs.com /articles/memory/display/ddr-sdram.html (2520 words)

	DDR SDRAM Upgrades and Information
		DDR is built in many different ways and may not always look exactly like the photo above.
		It shouldn't be confused with SDRAM which has 168 pins and 2 notches.
		It shouldn't be confused with laptop SDRAM which has 144 pins and 1 notch more toward the center.
	www.4allmemory.com /info/ddr-memory.cfm (374 words)

	PC World - Samsung Plans Faster DDR Memory
		The DDR SDRAM chip offers a data transfer speed of 2.4 gigabits per second, according to Samsung.
		The company originally announced the development of the 300-MHz DDR SDRAM chip in May, although at the time officials said it would have a capacity of 64 megabits when it reached mass production.
		DDR memory can transfer data at twice the speed of conventional SDRAM chips.
	www.pcworld.com /news/article/0,aid,54886,tk,dn071101X,00.asp (550 words)

	DDR SDRAM and SDRAM, The evolution of DDR SDRAM, DDR PC2100, PC2700, PC3200, PC4200.
		DDR memory has 184 pins, where as SDRAM has 168 pins.
		DDR Memory is a new type of SDRAM that is able to double the read / write speed of the previous generation of SDRAM memory.
		During the 90s, there was a sudden shift in the PC market towards the Athlon and Duron, Durron can be attributed to AMD's lower costs when compared to its primary competitor, Intel.
	www.ddrmemoryram.com /ddrsdram_and_sdram.html (738 words)

	Ace's Hardware (Site not responding. Last check: 2007-10-23)
		DDR certainly does promise quite a lot, and understandably, expectations are very high.
		DDR SDRAM technology is ready to be launched and Micron is already offering DDR SDRAM DIMMs (both registered and unbuffered) through Crucial Technology for developers.
		As we have unbuffered DDR SDRAM, we tested the "Hurricane" board, which is manufactured to work with "normal" unbuffered DDR SDRAM only and is not much different from your typical microATX motherboard.
	www.aceshardware.com /Spades/read.php?article_id=15000177 (784 words)

	Xilinx : DDR/DDR2 DRAM
		DDR2 SDRAM, the next evolutionary step from DDR (Double Data Rate), introduces new features and functions that enable higher clock and data rate operations.
		This application note describes a 200-MHz DDR SDRAM (JEDEC DDR400, PC3200 standard) controller implemented in a Virtex™-5 device.
		This demo tours the 533 Mbps DDR2 SDRAM memory interface design using the Memory Interface Generator, which is a hardware system verification for the 300 MHz QDR II SRAM interface design using the ChipScope Pro in circuit analyzer and the Xilinx Advanced Memory Development System.
	www.xilinx.com /products/design_resources/mem_corner/resource/xaw_dram_ddr.htm (892 words)

	DDR SDRAM Controller - Pipelined
		The Double Data Rate (DDR) Synchronous Dynamic Random Access Memory (SDRAM) Controller is a general-purpose memory controller that interfaces with industry standard DDR SDRAM.
		The DDR SDRAM Controller - Pipelined is available as an IPexpress user configurable IP core, which allows the configuration of the IP and generation of a netlist and simulation file for use in designs.
		Please note that in the LatticeECP33 with an SDRAM data path width of 32 bits, the fMAX achieved is 133 MHz.
	www.latticesemi.com /products/intellectualproperty/ipcores/ddrsdramcontrollerpipelin.cfm (533 words)

	VisionTek - SDRAM White Paper
		SDRAMs are more difficult to design, and the devices operate so quickly that they could produce noise, resulting in system difficulties.
		DDR supporters claim the bandwidth capacity is near 200MHz, and only limited by address- and control-cycle overhead and the fact that address cycles will use only the rising edge of the memory clock, giving them half the bandwidth of data cycles.
		DDR is also an open architecture that promises to be a simple transition for both memory and chip-set manufacturers.
	www.bahzone.net /mirror/Visiontek/sdramwp.html (4438 words)

	DDR SDRAM and the TM-4
		DDR SDRAM is a dynamic ram standard that is designed to provide high memory depth and bandwidth.
		In a DDR SDRAM dimm there are usually two memory chips connected in parallel, with only their chip enable signals being unique.
		The arbitor allows user requests for reads and writes between the SRAMs and the DDR SDRAMs to be submitted to the memory controller logic, and the controller logic contains all the necessary circuitry to initialize the memory, perform refreshes, and perform burst transactions.
	www.eecg.toronto.edu /~tm4/ddrsdram.html (1417 words)

	Micron DDR SDRAM Products (Site not responding. Last check: 2007-10-23)
		DDR SDRAM captures data at twice the clock frequency, creating high-speed, low-power, high-density components.
		Micron's DDR SDRAM supports a number of features, including source-synchronous interface, which simplifies timing (especially at higher speeds); an internal, pipelined 2n-prefetch architecture, which allows two data accesses per clock cycle; and a quad-bank architecture, which allows for reduction of row access overhead.
		DDR is a mainstream memory used in all levels of desktop, notebook, and server platforms.
	www.micron.com /products/dram/ddrsdram (378 words)

	DDR SDRAM MEMORY - 266mhz PC2100 and 333mhz PC2700 DDR Memory
		DDR SDRAM memory has 184 pins, where as SDRAM has 168 pins.
		DDR SDRAM Memory is a new type of SDRAM that is able to double the read / write speed of the previous generation of SDRAM memory.
		Along the way, there has been a push in the SDRAM manufacturing industry to have the present type of memory run faster, alongside the blazing processor speeds now available in the PC marketplace.
	www.ddrsdrammemory.com (397 words)

	"DDR-II SDRAM Technology and Design Trends"
		DDR-II SDRAM provides designers technical and economic benefits as compared to SDRAM and DDR-I. For example, DDR-II memory offers at least a 4 times speed increase over SDRAM and 2 or more times speed increase over DDR.
		These features are facilitated by the controller, but their use depends on the programming of the controller by the system/board designer.
		Through this paper the technical audience will gain a solid understanding of what DDR-II SDRAM is all about and how to evaluate and implement good signal integrity in high- performance DDR-II system memory designs.
	www.nesa.com /ddr2sdram2003.html (307 words)

	Installing RAM DDR SDRAM DIMM Module - DDR Memory Upgrades
		DDR memory technology is an evolutionary improvement of mature PC100 and PC133 SDRAM technology.
		DDR memory chips are produced by semiconductor manufacturers using existing wafer fabs, processes and testers resulting in lower memory chip costs.
		If you are looking for a system with the fastest available RAM consider one with DDR RAM, or the more expensive, but not necessarily superior Rambus RAM, which is supplied in modules called RIMMs.
	www.ddrmemoryupgrades.com /howto_install_ram.html (1379 words)

	Memory upgrades from Crucial Europe - Why DDR SDRAM? (Site not responding. Last check: 2007-10-23)
		DDR SDRAM is a straightforward evolution from current single data rate (SDR) SDRAM.
		DDR, which stands for Double Data Rate SDRAM, actually doubles the bandwidth available to your system and runs twice as fast as regular SDRAM.
		An additional benefit of DDR is that it only uses 2.5 volts per signal, as opposed to the 3.3 volts used in current SDR SDRAM.
	www.crucial.com /uk/ddr/why_ddr.asp (486 words)

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