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Altera_Forum
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15 years ago

Arria II with single DDR3 SODIMM

Hello, I am trying to use an Arria II with a single DDR3 SODIMM and was wondering if I can avoid parallel termination and use a simpler termination scheme. I can place the SODIMM as close to th...
Altera_Forum's avatar
Altera_Forum
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15 years ago

Jake,

You are correct; Arria II does have termination for DQ and DQS and I should be able to use a point-to-point termination as illustrated on page 10 of AN520. I believe most or all of the other signals are terminated on the DIMM and a point to point scheme should work fine.

My confusion started as I read through AN520 in the Arria II section in which they suggest using the DDR2 guidelines. So, I looked at what they did in the Arria II Dev board, and they did not use a point to point topology for either the DDR2 DIMM or the DDR3 chip. Was that by choice or was there a limitation that caused them to do so?

I will do pre/post layout simulation eventually, but wanted to start in the right direction.