Nebruda Posted February 15, 2016 Share Posted February 15, 2016 Hi I have purchased a Zybo board for software development of my new project; I ask why in the schematic ( Rev B3) there are no termination resistors for DDR3, which I find rather on your ZedBoard ? Best regards. Nebruda Link to comment Share on other sites More sharing options...
elodg Posted February 15, 2016 Share Posted February 15, 2016 On the Zybo, a different routing topology has been used (tree vs. fly-by), that allowed for shorter traces and the use of near-series termination, instead of far-parallel. Link to comment Share on other sites More sharing options...
Nebruda Posted February 15, 2016 Author Share Posted February 15, 2016 Hi elodg, I wish that the two DDR3 are mounted on the top side of the my PCB as ZedBoard; what type of termination do you suggest? Parallel or series? Thanks. Link to comment Share on other sites More sharing options...
elodg Posted June 14, 2016 Share Posted June 14, 2016 Although this is an old post, I would like to clarify the situation. @Nebruda, I see no reason to prefer DDR3 on a certain side from the user's point-of-view. Both topologies are technically sound and functionally the same. They present advantages and disadvantages for the board designer only. The tree topology on the Zybo allowed us to save a power supply, resulting in a more compact board. However, compared to the fly-by topology it is harder to route and validate. Link to comment Share on other sites More sharing options...
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Nebruda
I have purchased a Zybo board for software development of my new project; I ask why in the schematic ( Rev B3) there are no termination resistors for DDR3, which I find rather on your ZedBoard ?
Best regards.
Nebruda
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