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DDR3 Memory

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gge's picture
gge
Junior(0)
DDR3 Memory

Hello Again.
 
I wanted to ask another question about the Zedboard.  This one is particular to the DDR3 Memory spec'd out for the Zedboard.  We are currently using the Zedboard and want to make a custom version of it.  Looking at the DDR3 spec'd out it is the Micron, MT41K128M16JT-125:K which is hard to find in stock with anyone.  Is there a qualified 2nd source for the memory that is easier to obtain and would not change any of the parameters in firmware/software side?
 
Thanks
Gary

fletch's picture
fletch
Moderator(16)
4G Micron, Kingston or ISSI

Gary,

Here are a few thoughts:

  • I do not believe that there is a qualified 2nd source for the MT41K128M16JT-125:K, although to be sure, you would have to contact Digilent as they are the manufacturer of that board.
  • From the Micron perspective, other temperature grades, speed grades, or going to the 256M depth would all be functionally compatible with MT41K128M16JT-125:K.
  • Avnet Americas does have 3 similar products in stock, although minimum quantities are required. It might be worth checking with your local Avnet office to see if there is a way around those minimums.
    https://products.avnet.com/shop/SearchDisplay?searchTerm=MT41K128M16JT&s...
  • Although different boards, MicroZed and PicoZed use a very similar Micron 4G DDR3. On those boards, Avnet did qualify both Kingston and ISSI. See the following PCN: http://microzed.org/sites/default/files/documentations/Product%20Change%...
  • From ease of use, ease of supply, ease of design, and faster time to market, I enourage you to consider designing a SOM Carrier card for one of the Zynq SOMs, like MicroZed or PicoZed, rather than doing a full chip-down design of your own. Then you don't have to worry about which specific DDR3's are compatible. You don't have to deal with high-speed layout of the DDR3/Zynq interface.
  • Whether you move ahead with a carrier design or design based on ZedBoard, if you are willing to work with your Avnet FAE, they can get you the schematic/layout source files for either the ZedBoard or any of our SOM carriers. Contact your local Avnet FAE and request this.

Bryan