Connecting GT Reference Clocks to HDMI GT Controller and GT Wizard - 1.0 English

HDMI GT Controller LogiCORE IP Product Guide (PG334)

Document ID
PG334
Release Date
2022-04-21
Version
1.0 English

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 constant value of 1 respectively. Follow the clock buffer connections as shown in the following figure.

Figure 1. Connecting the GT Reference Clock
Note: BUFG_GT_CE port of the BUFG_GT buffer must be driven High.
Note: IBUF_DS_ODIV2 port of the IBUFDSGTE is by default configured to output divide by 1.
Note: It is not necessary that the transceiver GT_REFCLK always 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_odiv2 port while the same refclk can be connected to the transceiver's REFCLK1. Refer to the clock connection guidance from the Versal® GT Quad.