The reference clock output mode structure with the OBUFDS_GTME5_ADV primitive is shown in the following figure. The ports and attributes controlling the reference clock output are tied to the OBUFDS_GTME5_ADV software primitives. The port RXRECCLKSEL controls the multiplexer that selects between HSCLK*_RXRECCLKOUT[0/1] from the four different channels in a Quad.
Figure 1. Reference Clock Output Use Model with OBUFDS_GTME5_ADV