https://docs.amd.com/r/2022.1-English/ug974-vivado-ultrascale-libraries/MUXF8?contentId=QUGbKIFURkHnZpstDXmpLg
MUXF8 - MUXF8 - 2022.1 English - Primitive: CLB MUX to connect two MUXF7's Together - UG974
Primitive: CLB MUX to connect two MUXF7's Together