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Explorer
Explorer
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Registered: ‎09-06-2019

ZCU106 VCU TRD HDMI RX

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Hello,

We are currently in the process of re-spinning a board in which a DVI-D interface shall be used along with the TMDS18 part that was used on the HDMI RX side of the 2019.1 TRD as shown below.

Capture.PNG

Our design only needs to capture DVI and then will either write to a file or stream out to a SDI sink. After looking at the example project it looks like there is an AXI IIC module within the block design to configure the SI chip as well as communicate to the TX HDMI redriver (SN65DP159RGZ) and does not look to have anything for the RX side of the TMDS18 (SCL_SNK and SDA_SNK which are the DDC signals). Here is the given device tree node for the iic module:

 

&mpsoc_ss_hdmi_ctrl_iic {
	clocks = <&vid_s_axi_clk>;
	/* Si5319 i2c clock generator */
	si5319: clock-generator@68 {
		status = "okay";
		compatible = "silabs,si5319";
		reg = <0x68>;
		#address-cells = <1>;
		#size-cells = <0>;
		#clock-cells = <1>;

		/* input clock(s); the XTAL is hard-wired on the ZCU102 board */
		clocks = <&refhdmi>;
		clock-names = "xtal";

		/* output clocks */
		clk0 {
			reg = <0>;
			/* HDMI TX reference clock output frequency */
			clock-frequency = <27000000>;
		};
	};

	/* DP159 exposes a virtual CCF clock. Upon .set_rate(), it adapts its retiming/driving behaviour */
	dp159: hdmi-retimer@5e {
		status = "okay";
		compatible = "ti,dp159";
		reg = <0x5e>;
		#address-cells = <1>;
		#size-cells = <0>;
		#clock-cells = <0>;
	};
};

 

If we do not plan to use the HDMI TX is it necessary to implement this part of the circuitry? I'm unclear what the HDMI RXSS is actually doing if anything at all in the vcu_hdmirx example design.

Thanks for the help!

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Xilinx Employee
Xilinx Employee
230 Views
Registered: ‎08-02-2007

If you don't need HDMI Tx, DP159 is not needed. For TMDS181, do you plan to pass HDMI 2.0 compliance? If so, you need it.

 

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Xilinx Employee
Xilinx Employee
231 Views
Registered: ‎08-02-2007

If you don't need HDMI Tx, DP159 is not needed. For TMDS181, do you plan to pass HDMI 2.0 compliance? If so, you need it.

 

View solution in original post