Spreadsheet for DDR3 Fly-by topology

[Rishat]

Hello,

Could you please provide a DDR3 spreadsheet for Fly-by topology the same like the T-branch one from Lesson 4 of the Advanced PCB Layout Course?

[robertferanec]

We have spreadsheet for OpenRex: https://www.imx6rex.com/open-rex/

Here it is: OpenRex DDR3 length calculator - spreadsheet.zip

Hope this helps

[Rishat]

Hi Robert, thank you very much. So you say I should manually measure every net by the tool "Measure Selected Objects" to fill those cells in the spreadsheet, right? Is there any other way to fill the spreadsheet?

[robertferanec]

You can ... or this can be also a way to do it:

https://youtu.be/jpk-hfsFaqA

[Rishat]

You can ... or this can be also a way to do it:
https://youtu.be/jpk-hfsFaqA

In spite of using xSignals in length matching should I still fill the spreadsheet?

[robertferanec]

We do it. Simple reason is, that Altium keeps changing the algorithm what calculates the total length, spreadsheet is always the same and easy to verify.