How to know upto what length i have to route a trace in case of high speed signals when no guidelines is provided by the IC vendor.
Industrial standard interface have it's specification for common electrical and mechanical, so you can look up the CEM specification and use it as a baseline if you can't get the model or design guide from IC vendor.
For propertied interface, you have to guess it if you have no IC model nor design guide /datasheet( I can't image there is a case that you are using a propertied interface and the vendor refuse to provide design guide).
If you just wanna investigate how the signal get attenuate along trace, Hyperlyny Linesim is a good tool to help you to visulize it. You can do length sweep simulation
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