Many people say that the IP core in QUAYUSII is a fee, and it can't be used directly. Actually, I will use the core of the FIR filter to introduce the use of the IP core. I hope it will help you a bit.
Use
(1) First establish the project, this will not say. Then create a schematic file or a .v file
(2) Open the magevizard toolbox, as shown
(3) Then find the core you want to use, find fir09 here
(4) then 
Write the name of the file you want, 
Then next. This menu bar appears. As shown below
Then came the step by step, 
Set the parameters, 
Generate simulation files 
Finished.
(5) Then you can call it in a .v or schematic file.
(6) The specific method of use depends on the use of the document.
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