Occasional Contributorset_max_skew giving path not found warning
Hello,
I have a set of signals passing between asynchronous clock domains in an spi slave module.
I get the following warning when i try to add the max skew constraint
Warning (332182): No path is found satisfying assignment "set_max_skew -from [get_keepers {*spi*shift_reg*}] -to [get_keepers {*spi*rx_data_reg*}] -get_skew_value_from_clock_period min_clock_period -skew_value_multiplier 0.800 ". This assignment will be ignored.
The exact command from the sdc file is also included
set_max_skew -from [get_keepers {*spi*shift_reg*}] -to [get_keepers {*spi*rx_data_reg*}] -get_skew_value_from_clock_period min_clock_period -skew_value_multiplier 0.8
Thanks
Jay
Hey,
I have the exact same problem. https://community.intel.com/t5/Intel-Quartus-Prime-Software/Crossing-Clock-Domain-Problems-Timing-Analyser-ignores-set-max/td-p/1308590 .
However it works during the place and route and also the designs output is correct. I can not detect any metastability.Am I right assuming that this error just occurs while using the Timing Analyser and no error is thrown during compilation?
Sadly I also got no answer as do other people with the same question (looking through the forum it gets asked at least once a week I would say).
Best regard
Christian
