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Topic: SDR SDRAM

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	SDR SDRAM - Wikipedia, the free encyclopedia
		SDR SDRAM is Single Data Rate synchronous dynamic random access memory, a type of computer memory.
		SDRAM was introduced in 1997, and by 2000 had replaced all other types of DRAM in modern computers, because of its greater speed, and much lower latency.
		SDRAM is also available in registered memory varieties, for systems that need greater scalability.
	en.wikipedia.org /wiki/SDR_SDRAM (422 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.
		Hence you can run DDR SDRAM at lower clock speeds than it was made for (underclocking) or higher clock speeds than it was made for (overclocking).
		DDR SDRAM DIMMs have 184 pins (as opposed to 168 pins on SDRAM, or, 240 pins on DDR-2), and can be differentiated from SDRAM DIMMs by the number of notches (DDR SDRAM has one, SDRAM has two).
	en.wikipedia.org /wiki/DDR_SDRAM (650 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		SDRAM is an acronym for Synchronous DRAM that means a DRAM technology that uses a clock to synchronize signal input and output on a memory chip.
		To adapt the SDRAM speed to the speed of the backend a handshake procedure between the backend interface and the external SDRAM interface is foreseen.
		Apparatus according to Claim 1 wherein the SDRAM (SDR) is used within an frontend IC of said optical recording or reproduction device for a correction of found errors and a storage of data to compensate physical fluctuations of the optical recording or reproduction apparatus.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/45101.010621&ELEMENT_SET=DECL (3266 words)

	FREE VHDL SDR SDRAM controller
		SDRAM is ready to normal operation after initialization time, which is 100 us for Micron 32x2 MB.
		SDRAM controller informs host when initialization is completed by driving nDTACK low for one cycle.
		User interface to sdram controller is very simple and frees user from issuing complicated commands to sdram memory.
	www.geocities.com /mikael262/sdram.html (667 words)

	DDR/SDR SDRAM (Site not responding. Last check: 2007-10-12)
		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 (316 words)

	¿ DDR SDRAM SDR ? - ResellerRatings
		SDram is the module name (Synchronous Dynamic Random Access Memory) SDR is Single Data Rate, DDR is Double Data Rate.
		SDR is probably coined from the Video card market right after the creation of DDR, so it would clear up any questions about which was faster.
		For instance, when using SDRAM on an AMD board at 133mhz, it was my understanding that the 'data rate' was 266 because the socket A standard is to send 2bits of infomation per cycle.
	www.resellerratings.com /forum/t50290.html (702 words)

	IP.com's Prior Art Database
		In section 2, a brief description of the DDR SDRAM devices, as well as contrasts of their functionality to SDR SDRAMs are given.
		An examination of the SDR SDRAM and DDR SDRAM functional block diagrams reveals that the memory core is essentially the same.
		The SDR memory data interface is a fully synchronous design in which the data is only captured on the rising clock edge.
	www.priorartdatabase.com /IPCOM/000021936 (586 words)

	SDRAM DDR RAM and Rambus DRAM Info
		SDRAM latency tends to be about 10 front-side bus (FSB) cycles for the first read and one FSB cycle for each read after that.
		Double Data Rate (DDR) SDRAM is essentially the same thing as SDR SDRAM, except that it can output data on both the rising and falling edges of the clock signal.
		DDR SDRAM will also be beneficial if you tend to have several applications open and busy at once, because the resulting chaos in memory access patterns will result in many more row changes.
	www.gen-x-pc.com /ram_memory_info_5.htm (3106 words)

	DDR Memory Upgrade (Site not responding. Last check: 2007-10-12)
		Single data rate (SDR) SDRAM is the older type of memory, commonly used in computers prior to 2002.
		DDR SDRAM is a straightforward evolution from SDR SDRAM.
		The big difference between DDR SDRAM and SDR SDRAM is that DDR reads data on both the rising and falling edges of the clock signal, so the DDR module can transfer data twice as fast as SDR SDRAM.
	www.ddr-memory-upgrade.com (359 words)

	The Vanishing Data Valid Window (Site not responding. Last check: 2007-10-12)
		SDR SDRAM memories use a synchronous interface with all inputs referenced to the rising edge of an incoming clock.
		DDR SDRAM data is sampled relative to both edges of the input clock, doubling the effective data rate/bandwidth of the memory over SDR SDRAM devices.
		As shown in Table 1, the tDV is shrinking as we move from SDR SDRAM to DDR-I and DDR-II SDRAM memories.
	www.evaluationengineering.com /archive/articles/1002pc.htm (1947 words)

	Cleddau Computer Clinic - Pembrokeshire Computer Sales & Repairs
		SDR stands for Single Data Rate and DDR stands for Double Data Rate, and generally speaking, as the name implies, DDR memory will run twice as fast SDR Memory.
		SDR SDRAM comes in three main flavors and is found in older systems generally built in the 1990's.
		SDR SDRAM has 168 connector pins on the chip and the motherboard that you are using will usually support either SDR SDRAM or DDR SDRAM although some motherboards do support both types of chips by having both types of slots available.
	www.cleddau.com /computersexplained3.html (411 words)

	How the hell… do I countersue Rambus? \| The Register
		As to the DDR SDRAM devices and modules identified in Paragraph 9, Hitachi admits that it has manufactured and exported to the United States samples of DDR SDRAM devices HM5425401 and HM5425801, and samples of DDR SDRAM module HB54A5129.
		SDRAMs incorporate a system of clocks that key the memory operations to a series of electronic pulses generated by the clocks.
		To manufacture any type of SDRAM memory chips or Logic Chips for OEMs or other systems companies, a manufacturer must have access to technology that permits the Logic Chips and SDRAM memory chips to communicate or “interface” with one another in a compatible manner at high speeds.
	www.theregister.co.uk /2000/06/26/how_the_hell_do/page2.html (10720 words)

	Review: OCZ Performance Series SDRAM and Thermaltake Memory Cooling Kit
		If you don't, just rest assured that as SDR memory goes, this stuff is capable of running faster than most motherboards can run it, and it should perform as well at highly elevated speeds as pretty much any other PC SDR RAM in existence.
		The standard memory bus speeds for computers that use SDR SDRAM are 66, 100, and 133MHz.
		Pentium III systems with SDRAM don't have a doubled bus, and so running RAM faster than the FSB on these systems seems to be pretty much a total waste of time.
	www.dansdata.com /fastram.htm (4075 words)

	WH: Re: 800Mhz Transmeta CharmIT wearable
		The DDR SDRAM controller supports only Double Data Rate (DDR) SDRAM and transfers data at a rate that is twice t= he clock frequency of the inter-face.
		The frequency setting for the SDR SDRAM interface is initialized during t= he power-on boot sequence.
		Although the processor supports an SDR interface frequency in the range of 1/2 to 1/15 of the core frequency, the recommen= ded interface frequency is between 100 and 133 MHz.
	wearables.blu.org /wear-hard-02/20027100.html (1719 words)

	LD-DDR-SDRM-C-0001-050
		SDRAM Controller is dedicated for MAC controller and processor accesses to a common SDRAM memory.
		SDRAM Controller accepts any SDRAM device compliant with JDEC Standard N0 21-C, covering a large family of SDR-SDRAM or DDR-SDRAM.
		There is the possibility of cumulating of refresh requests in case of conflict with the user requests (up to 15 refresh requests) and service them later in back to back fashion.
	www.ldic.com /IP_Licensing/LD-DDR-SDRM-C-0001-050.htm (512 words)

	Source for SDRAM chips - Embedded System
		I was using ARM devices with on-chip SDRAM controllers, e.g.
		SDR to work, but there are encouraging projects that show it can be
		SDR does have a requirement for "stable timing" on the clock line, which
	www.castalk.com /post-4455.html (2212 words)

	Xilinx : SDR SDRAM
		Synchronous Dynamic Random Access Memory (SDRAM) is a generic name for the various kinds of DRAM that are synchronized with the microprocessor clock.
		The speed of SDRAM is rated in MHz rather than in nanoseconds (ns).
		For example, a 16 MB SDRAM may be described as a 1 MB x 8-bit x 2 banks.
	www.xilinx.com /products/design_resources/mem_corner/resource/xaw_dram_sdram.htm (192 words)

	What is SDR SDRAM?
		SDR SDRAM is the original SDRAM standard, which has since been replaced by DDR SDRAM.
		DDR SDRAM doubles the bandwidth of SDR DRAM by transferring data twice per cycle on both edges of the clock signal, implementing burst mode data transfer.
		SDRAM DIMM modules are sold according to clock speed (MHz), bus speed (megatransfers per second), and transfer rate (megabytes per second.
	www.tech-faq.com /sdr-sdram.shtml (144 words)

	AnandTech
		SDR SDRAM memory uses such ratings as PC66, PC100, PC133, etc. They just add PC in front of the clock speed (in MHz) the memory is running at.
		Therefore DDR SDRAM that runs at 200MHz would have a classification of PC1600 because the bandwidth is 1.6 gigabytes or 1600 megabytes per second.
		PC2100 DDR SDRAM is running at 266MHz and provides 2.1 gigabytes per second or 2100 megabytes per second.
	www.anandtech.com /guides/viewfaq.aspx?i=49 (456 words)

	Memory Solutions Center—SDR SDRAM (Site not responding. Last check: 2007-10-12)
		Single data rate (SDR) SDRAM was the first dynamic random access memory (DRAM) type to support the transfer of data on every clock by providing a clock-synchronous interface.
		SDRAM is still being used today, although DDR SDRAM is now the lowest-cost memory type available.
		Altera offers software support and tools that aid in the SDR SDRAM memory interface design process as shown in Table 3.
	www.altera.com /technology/memory/dram/sdr/mem-sdr_sdram.html (282 words)

	SDR SDRAM - TheBestLinks.com - Computer memory, DDR SDRAM, ... (Site not responding. Last check: 2007-10-12)
		SDR SDRAM - TheBestLinks.com - Computer memory, DDR SDRAM,...
		SDR SDRAM is Single Data Rate SDRAM, a type of computer memory.
		The term is used to contrast with Double Data Rate SDRAM, or DDR SDRAM, but since single data rate SDRAM was the only sort available when SDRAM was introduced, it is more commonly called "ordinary SDRAM" or something similar, rather than "SDR SDRAM".
	www.thebestlinks.com /SDR_SDRAM.html (110 words)

	Dimm sdr
		This website has information on sdram dimm and details of so dimm is not definition dimm.
		dimm 256mb cannot be simm dimm, ddr dimm sdram The best thing about ddr dimm memory by sdram dimm memory, computer dimm and related to ddr2 dimm, 128 dimm mb sdram and best dimm pin.
		dimm pc100 sdram and related to dimm syncdram etc. dimm roy, bar code dimm.
	www.hostmerit.com /ffalinks/dimmsdr.html (259 words)

	Free Pc Tech Support
		Last time, we took a quick look at PC66/100/133 SDRAM and how it worked with the chipset in your computer to communicate with the CPU and the rest of the system.
		DDR SDRAM is an outgrowth of what we now call Single Data Rate or SDR SDRAM.
		Functionally, the difference between the two is just as the name implies: DDR SDRAM is capable of providing data at twice the rate of SDR SDRAM.
	freepctech.com /articles/articles.php?ArticleId=121 (999 words)

	X-bit labs - Hardware news - SDR SDRAM-Based Systems Not to Sink Into Oblivion for Another Quarter.
		Therefore, as this web-site claims, SDR SDRAM powered systems will still be on the market for another quarter or even a bit more.
		Since SDR SDRAM memory is sometimes two times cheaper compared to DDR SDRAM, and there are a lot of inexpensive mainboards with SDR SDRAM support, a lot of system integrators are going to offer their clients systems with SDR SDRAM memory inside.
		In case market acceptance of the newly launched mainboards with SDR SDRAM memory support will be relatively high, some system integrators and their OEM manufacturers may buy additional core-logic devices for their SDRAM platforms.
	www.xbitlabs.com /news/other/display/news6371.html (510 words)

	Memory upgrades from Crucial Europe - DDR: How does it work? (Site not responding. Last check: 2007-10-12)
		Double data rate (DDR) SDRAM gives you twice the bandwidth of standard SDRAM, which is the type of memory built into most computers today.
		The big difference between DDR SDRAM and standard SDRAM is that DDR reads data on both the rising and falling edges of the clock signal.
		DDR modules, like their SDR SDRAM predecessors, are called DIMMs.
	www.crucial.com /uk/DDR/ddr_explained.asp (360 words)

	Mitsubishi Electric US Companies Press Release
		The high-density module families use Mitsubishi Electric’s discrete 512- or 256-Mbit DDR or SDR SDRAMs, which are manufactured in a leading-edge 0.15-m m CMOS process technology.
		DDR SDRAM modules with up to a PC2700 speed grade will be built with DDR SDRAM chips that have up to a DDR333 speed grade, depending on the configuration.
		SDR SDRAM modules will be available in the PC133 speed grade.
	www.mitsubishielectric.com /news/2001/edg_2-Gbyte_DIMMs_10-30-01.html (672 words)

	DDR SDRAM - Psychology Central (Site not responding. Last check: 2007-10-12)
		Thus a 100 MHz DDR system has an effective clock rate of 200 MHz when compared to equivalent SDR SDRAM, the “SDR” being a retrospective designation.
		DDR SDRAM DIMMs have 184 pins (as opposed to 168 on SDRAM), and can be differentiated from SDRAM DIMMs by the number of notches (DDR SDRAM has one, SDRAM has two).
		DDR operates at a voltage of 2.5 V, compared to 3.3 V for SDRAM.
	psychcentral.com /psypsych/DDR_SDRAM (690 words)

	Go4Expert - What is the difference between SD Ram and DD Ram?
		The letters SDR and DDR stand for Single Data Rate and Double Data Rate, and the letters SDRAM stand for Synchronous Dynamic Random Access Memory.
		The main difference between SDR and DDR memory is speed.
		SDR SDRAM comes in three main flavors: PC66, PC100 and PC133.
	www.go4expert.com /forums/showthread.php?t=54 (271 words)

	When the "wrong" RAM is right - TechUpdate - ZDNet (Site not responding. Last check: 2007-10-12)
		The RDRAM computer had a top-of-the-line nVidia GeForce3 graphics card while the SDRAM Pentium 4 system was cobbled with a last-generation GeForce2 MX--a surprising inclusion given the processor-and it will certainly keep the system out of the hands of gamers who have a narcotic craving for 3D performance.
		It suggests that there could be some manipulation of the configuration aimed at making you believe that the now-generation of SDR Pentium 4 systems will deliver what you want--strong business performance with limited gaming capability--and that there's no need, and therefore certainly no desire, to wait for DDR SDRAM to hit the scene.
		If the transition from SDR SDRAM to DDR SDRAM on AMD Athlon systems is any indicator, DDR on a Pentium 4 should provide the same performance boost that switching from Windows ME to Windows 2000 did in the systems above.
	techupdate.zdnet.com /techupdate/stories/main/0,14179,2814761,00.html (1385 words)

	Information Directory sdram design (Site not responding. Last check: 2007-10-12)
		Design The design of the SDRAM interface is based upon a need to abstract the operation of the SDRAM from the client module of the...
		The design of the SDRAM interface is based upon a need to abstract the operation of the SDRAM from the client module of the sdram_interface.vhd.
		OVERVIEW Double Data Rate (DDR) SDRAM was defined by JEDEC 1997, and it was designed to be a natural migration from PC100 and PC133 SDRAMs to higher data rates.
	www.digital-tips.com /sdram/sdram-design.htm (611 words)

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