Hi Robert,
I am in Lesson 6 of the Advanced PCB Layout course and was working on the "Length Matching of Differential Pairs" activity. I opened the"L6 - 04 - Differential Pair Length Matching - Module and Baseboard" project and was working on the the HDMI lines on the baseboard. I had a lot of problems with the "Interactive Differential Routing" Tool. If I deleted one of the HDMI pairs on L3 and then tried to redraw, I get various problems. The tool would generally not start or end the two traces reliably. I could usually eventually get the track drawn, but only after playing with them for awhile. There was one case where I could never get the one of the signals reconnected to one of the vias assigned to that track. In that case, I had to exit without saving, and try again. I thought that maybe something went wrong with your activity project, so I tried playing with the original baseboard project you supplied in Lesson 1, and had the same issues. The problem seemed to be worse when working on the L3 differential tracks, but I also had similar problems modifying the differential tracks on L1 and L6.
I have attached a photo that I took as I tried to redraw the differential pair "HDMI_CLK" on L3 to try and give you a flavor of what is happening. As you can see the two tracks are not being created properly as I am initiating the tracks out of those vias (only one of the two tracks is being created). I have done some differential pairs previously in your training classes and not noticed this problem before. I did just update to version 20.1.11 of Altium Designer fairly recently; is it possible that they have introduced a bug in that new version? Could you give this a try on this project using your latest version of Altium to see if you have the same problem?
Thank you!
I am in Lesson 6 of the Advanced PCB Layout course and was working on the "Length Matching of Differential Pairs" activity. I opened the"L6 - 04 - Differential Pair Length Matching - Module and Baseboard" project and was working on the the HDMI lines on the baseboard. I had a lot of problems with the "Interactive Differential Routing" Tool. If I deleted one of the HDMI pairs on L3 and then tried to redraw, I get various problems. The tool would generally not start or end the two traces reliably. I could usually eventually get the track drawn, but only after playing with them for awhile. There was one case where I could never get the one of the signals reconnected to one of the vias assigned to that track. In that case, I had to exit without saving, and try again. I thought that maybe something went wrong with your activity project, so I tried playing with the original baseboard project you supplied in Lesson 1, and had the same issues. The problem seemed to be worse when working on the L3 differential tracks, but I also had similar problems modifying the differential tracks on L1 and L6.
I have attached a photo that I took as I tried to redraw the differential pair "HDMI_CLK" on L3 to try and give you a flavor of what is happening. As you can see the two tracks are not being created properly as I am initiating the tracks out of those vias (only one of the two tracks is being created). I have done some differential pairs previously in your training classes and not noticed this problem before. I did just update to version 20.1.11 of Altium Designer fairly recently; is it possible that they have introduced a bug in that new version? Could you give this a try on this project using your latest version of Altium to see if you have the same problem?
Thank you!
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