The HDMI GT Controller opens the
gt_refclk[0-5]_odiv2 ports when selected as the reference
clock source from the Vivado IDE. See the following
figure on how to connect the GT reference clock from a differential input to the
HDMI GT Controller and GT Wizard.
Two Utility Buffers and a Constant instance are needed to fully connect the GT reference clocks, configured as IBUFDSGTE, BUFG GT, and a constant value of 1 respectively. Follow the clock buffer connections as shown in the following figure.
GT_REFCLKalways corresponds to the same refclk as the HDMI GT Controller (hdmi_gt_controller) core. For example, the RX refclk can be connected to the HDMI GT Controller core's
gt_refclk0_odiv2port while the same refclk can be connected to the transceiver's REFCLK1. Refer to the clock connection guidance from the AMD Versal™ GT Quad.