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LPDDR4 tracing for imx8mini

Question asked by Vladimir Sirik on Feb 3, 2020
Latest reply on Feb 3, 2020 by Yuri Muhin

one of my ctm has the question related to LPDDR4 tracing for imx8mini - 

 

there is the Table 31. "i.MX 8M Mini DDR package trace delays" into the « i.MX 8M Mini Hardware Developer’s Guide» with the delays into the picoseconds.

Question - to match LPDDR4 lines (for delays) we need to convert the PCB line lengths  into the delays. Please advise which formula we should use for it? For the waves propagating into the dielectric or into the air?  

 

Thanks for your help.

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