Apply CLOCK_BUFFER_TYPE on an input clock to describe what type of clock buffer to use.
By default, Vivado synthesis uses BUFGs for clock buffers. Supported values are "BUFG" , "BUFH" , "BUFIO" , "BUFMR" , "BUFR" or "none" . The CLOCK_BUFFER_TYPE attribute can be placed on any top-level clock port. It can be set in the RTL and XDC.