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    This memorable blog is about DRAM in all its forms, especially the latest standards: DDR3, DDR4, LPDDR3 and LPDDR4. Nothing is off limits--the memory market, industry trends, technical advances, system-level issues, signal integrity, emerging standards, design IP, solutions to common problems, and other stories from the always entertaining memory industry.
  • The Authors

    Graham Allan

    Graham Allan is the Sr. Product Marketing Manager for DDR PHYs at Synopsys. Graham graduated from Carleton University's Electrical Engineering program with a passion for electronics that landed him in the field of DRAM design at Mosaid in Ottawa, Canada. Beginning at the 64Kb capacity, Graham worked on DRAM designs through to the 256Mb generation. Starting in 1992, Graham was a key contributor to the JEDEC standards for SDRAM, DDR SDRAM and DDR3 SDRAM. Graham holds over 20 patents in the field of DRAM and memory design.

    Marc Greenberg

    Marc Greenberg is the Director of Product Marketing for DDR Controller IP at Synopsys. Marc has 10 years of experience working with DDR Design IP and has held Technical and Product Marketing positions at Denali and Cadence. Marc has a further 10 years experience at Motorola in IP creation, IP management, and SoC Methodology roles in Europe and the USA. Marc holds a five-year Masters degree in Electronics from the University of Edinburgh in Scotland.

Two DDR Tidbits

Posted by Graham Allan on April 7th, 2014

The definition of tidbit is:

1:  a choice morsel of food

2:  a choice or pleasing bit (as of information)

I’m going with the second one here.

DDR Tidbit #1

Did you happen to see last week’s episode of The Big Bang Theory called “The Indecision Amalgamation” that includes DDR memory getting a shout out?  At one point, the show featured Emmy award winning ultra-nerd Sheldon Cooper talking to his girlfriend Amy about his video game purchase dilemma – whether to buy the PS4 or the XBOX One.  Sheldon quips that he doesn’t think Amy is paying proper attention to his problem.  She apologizes and then feigns interest with overly enthusiastic responses as Sheldon explains the memory each system uses (DDR3 versus GDDR5).  The brief and comical exchange can be viewed at http://youtu.be/ue8eeQMar1M

DDR Tidbit #2

On a more serious note, DRAM vendor Micron Technology has a wonderful web site that is loaded with very useful information if you know where to look.  Some of the most useful information found there are their DRAM related application notes which Micron calls “Technical Notes”.  I have recently discovered a new one about DDR titled “Using DDR4 in Networking Subsystems”.  The name is a bit misleading and it is definitely worth a read as it contains an excellent overview of DDR4 and many of the new features found in DDR4 (15 pages worth!) and ends with design considerations for a few typical networking applications.  This document can be found at http://www.micron.com/-/media/Documents/Products/Technical%20Note/DRAM/tn_4003_DDR4_network_design_guide.pdf.  Be sure to look through the other technical notes from the past, there are some nuggets in there.  Thanks, Micron.

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