Hdmi Video Transmitter (HVTX)

Features

• For Arora FPGA family
• Compact - not exceed 200 LUTs, 200 FFs
• Modular - Divided into convenient modules
• Fmax - > 165 Mhz

Notes

• Video Only - only for clean video output
• RGB888 - the only format supported, but theoretically can do more as it modular
• DVI - doesn't use preamble and guard intervals to stay simple

In The Future

• AXI streaming support

Modules and usage

Copy the core file to your project

Complete example can be found here

hvtx_cursor

Slides the cursor over a frame of the specified size

hvtx_cursor #
( .WID(WIDTH)
, .FRAME_WIDTH(1650)
, .FRAME_HEIGHT(750)
) u_cursor
( .i_clk(pixel_clk)
, .i_rst(~rst_n)
, .o_x(x)
, .o_y(y)
);

hvtx_sync

Generates synchronization pulses based on the cursor position in the frame.
Latency: 2

hvtx_sync #
( .WID(WIDTH)
, .FRAME_WIDTH(1650)
, .FRAME_HEIGHT(750)
, .ACTIVE_WIDTH(1280)
, .ACTIVE_HEIGHT(720)
, .H_PORCH(110)
, .H_SYNC(40)
, .V_PORCH(5)
, .V_SYNC(5)
) u_sync
( .i_clk(pixel_clk)
, .i_x(x)
, .i_y(y)
, .o_hs(hs) // H Sync
, .o_vs(vs) // V Sync
, .o_de(de) // Active video
);

hvtx_mod

Combines current timings and active video data and produces a vector of 3 modulated tmds 10-bit symbols (per channel) ready for transmission
Latency: 4

hvtx_mod u_mod
( .i_pclk(pixel_clk)
, .i_sclk(serial_clk)
, .i_rst(~rst_n)
, .i_hs(hs)
, .i_vs(vs)
, .i_de(de)
, .i_video(video)
, .o_chan_vec(chan_vec)
);

hvtx_ser

Serializes tmds symbols and passes them to the LVDS output buffer. Serial clock should be 5 times faster than pixel clock. It is recommended to synthesize fast clock and then divide it by 5 to get pixel clock.

hvtx_ser u_ser
( .i_pclk(pixel_clk)
, .i_sclk(serial_clk)
, .i_rst(~rst_n)
, .i_chan_vec(chan_vec)
, .o_hdmi_clk_p(hdmi_clk_p_a)
, .o_hdmi_clk_n(hdmi_clk_n_a)
, .o_hdmi_chan_p(hdmi_chan_p_a)
, .o_hdmi_chan_n(hdmi_chan_n_a)
);