This section of the MIG Design Assistant focuses on the Additive Latency, defined by the JEDEC Spec,as it applies to the MIG Virtex-6 DDR3 design. NOTE: This. JEDEC. STANDARD. Double Data Rate (DDR). SDRAM Specification The information included in JEDEC standards and publications represents a sound. Micron Technology, Inc. All rights reserved. Products and specifications discussed herein are subject to change by Micron without notice.

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The actual DRAM arrays that store the data are similar dxr3 earlier types, with similar performance. This reduction comes from the difference in supply voltages: Another benefit is its prefetch bufferwhich is 8-burst-deep.


This advantage is an enabling technology in Specificaton transfer speed. High-performance graphics was an initial driver of such bandwidth requirements, where high bandwidth data transfer between framebuffers is required. Because the hertz is a measure of cycles per second, and no signal cycles more often than every other transfer, describing the transfer rate in units of MHz is technically incorrect, although very common.

It is also misleading because various memory timings are given in units of clock cycles, which are half the speed of data transfers. DDR3 prototypes were announced in early The Core i7 supports only DDR3.


DDR3 SDRAM – Wikipedia

Not only are they keyed differently, but DDR2 has rounded notches on the side and the DDR3 modules have square notches on the side. The CPU’s psecification memory controller can then work with either.

There is some improvement because DDR3 generally uses more recent dr3 processes, but this is not directly caused by the change to DDR3. As with earlier memory generations, faster DDR3 memory became available after the release of the initial versions.

Bandwidth is calculated by taking transfers per second and multiplying by eight. This is because DDR3 memory modules transfer data on a bus that is 64 data bits wide, and since a byte comprises 8 bits, this equates to 8 bytes of data per transfer. CL — CAS Latency clock cyclesbetween sending a column address to the memory and the beginning of the data in response.

AR# MIG Virtex-6 DDR2/DDR3 JEDEC Specification – Additive Latency

Some manufacturers also round to a certain precision or round up instead. Of these non-standard specifications, the highest reported speed reached was equivalent to DDR, as of May DDR3 modules are often incorrectly labeled with the prefix PC instead of PC3for marketing reasons, followed by the data-rate.


Under this convention PC is listed as PC In addition to bandwidth designations e.

DDRDand capacity variants, modules can be one of the following:. The DDR3L standard is 1. Devices that require DDR3L, which operate at 1. DDR3 memory utilises speciflcation presence detect.

It is typically used during the power-on self-test for automatic configuration of memory modules. From Wikipedia, the free encyclopedia. This article is about the computer main memory. For spcification graphics memory, see GDDR3. For the video game, see Dance Dance Revolution 3rdMix.

Retrieved 19 March Archived from the original on Retrieved 12 December Archived from the original PDF on Memory standards on the way”. Archived from the original on April 13, Retrieved 12 October Archived from the original on December 19, Dynamic random-access memory DRAM. Retrieved from ” https: All articles with unsourced statements Articles with unsourced statements from March Views Read Edit View history. In other projects Wikimedia Commons.

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