I have to get the least skew between 1bit data_in port and all registers it feeds. I've tried to include "set_max_skew" to the SDC file but everything became even worse. In case when I used single receiver channel satisfying result was reached by option "lock region", but using this way to make good skew for 24 channels doesn't seem possible.
set_max_skew is the constraint to specify maximum allowable skew between paths.
Did you compared the skew before and after the constrain in Timing Analyzer using "Report Max Skew" ?
Topic: 184.108.40.206. Maximum Skew (set_max_skew)
Another thing you might want to try remove the location constraint for the Input pins to give fitter more flexibility to achieve better skew.
Thanks for your reply.
I checked the skew by using a comand "report path" and my calculating the differece. I know that constrain skew is achieveble, but when I use "set_max_skew" the result of actual skew is worse than without any constrains. Here I have a small experement with this thing https://drive.google.com/open?id=1XC4QK_nwmswpdUEPY9IS4_woeTTtOxiL . Screenshots and some additional info in PDF and some instructions in readme.txt file. Also there's the project in this folder.