SimpleVOut -- A Simple FPGA Core for Creating VGA/DVI/HDMI/OpenLDI Signals
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SimpleVOut (SVO) is a simple set of FPGA cores for creating video signals
in various formats. The cores connect using AXI-streams. Most configurations
(resolution, framerate, colordepth, etc.) are set at compile-time using
Verilog parameters. See svo_defines.vh for details on those parameters.

SimpleVOut is licensed under the ISC license:

    Copyright (C) 2014  Clifford Wolf <clifford@clifford.at>

    Permission to use, copy, modify, and/or distribute this software for any
    purpose with or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

This directory contains:

    svosrc/
      This is the actual SVO sourcecode. If you use SVO simply copy this
      directory into your project.

    vivado_ip/
      An example Vivado IP wrapper (simplehdmi) for SVO. This IP provides a
      video DMA and a simple terminal overlay and creates DVI/HDMI signals.

    zybo_vl/
      An example design using SVO for the Zybo Board (Xilinx Vivado). This
      example is written in Verilog HDL.

    zybo_bd/
      An example Vivado block-design using the IPs from vivado_ip/.

The svosrc/ directory contains the following cores for outputing video
streams in different formats (see zybo_vl/system.v for usage examples):

    svo_enc.v
      The video "encoder". Other frameworks call this component a video
      timings generator. The output of this core can be fed directly
      into a DAC to create a VGA signal.

    svo_openldi.v
      This takes the svo_enc-output and creates an OpenLDI (aka LVDS)
      video signal.

    svo_tmds.v
      This takes the svo_enc-output and creates a DVI/HDMI video signal.

The following cores can be used to create video streams:

    svo_tcard.v
      This core generates a static test card.

    svo_pong.v
      A little pong game. This is implemented as video overlay, so it
      is perfect as an easter-egg for your design.

    svo_term.v
      A text terminal. Only stores the last N (default=2048) characters
      and scrolls when running out of character memory. Good for
      dislaying debug information (such as early boot messages).

    svo_vdma.v
      A video DMA controller. Has a read-only AXI4 master interface to
      access the video memory.

See also svo_utils.v for various helpers for combining video streams. The
svo_pong core is in fact a collection of various cores generating video
overlays that are combined using the helper modules from svo_utils.v. So
have a look at svo_pong.v for usage examples for the stuff in svo_utils.v.