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Question asked by Seung-Gon Hong on Aug 8, 2016
Latest reply on Aug 9, 2016 by Seung-Gon Hong

I found attached PCB stackup file for SDP board and I checked the stackup of LAY-27392_C.brd. I got to know they are different.

In attached file, impedance of differential 100 ohm on top and bottom layer is controlled 3.7/9/3.7, but controlled 3.7/5.3/3.7 in Lay-27392.brd.  Differential 90 ohm is also different. I think LAY-27392 seems to comply with the Hardware Development Guide document (IMX6DQ6SDLHDG).

In addition, the thickness information is  also different. LAY-27392 is 41.74 mil (1.06 mm) as below picture, but actual measurement value is 62 mil (1.57mm). I don't know what stack-up I refer.


I want the exact data of LAY-27392 for impedance control.