Critical Path

[Lizwi]

1. Is it normal for one input not to show under timing when I look at list of paths in Vivado timing report?

2. What does infinite slack mean?

 

[Bluejets]

Normally "not showing details here" to start with.

 

[Harald Kapp]

2. What does infinite slack mean?

See here.

 

[ahsrabrifat]

Infinite slack typically means that Vivado has not found any timing path for the signal in question, meaning there is no dependency on a clock edge. Here is a video about Vivado's timing reports.