An XLR8 XB which will run on the Alorium Technology Snō board and produce a simple VGA text demo over HDMI
This Xcelerator Block will run on the Alorium Technology Snō FPGA board and will produce a simple VGA text demo over HDMI at 640x480 pixels (60Hz).
The Verilog for the HDMI video, audio and VGA text generator is a remix of the HDL Utils written by Sameer Puri:
- https://github.com/hdl-util
- https://github.com/hdl-util/hdmi-demo
- https://github.com/hdl-util/vga-text-mode
- https://github.com/hdl-util/sound
- https://github.com/hdl-util/hdmi
CLKDivider and DifferentialSignal are taken from the KAMAMI maXimator HDMI Test example by Michał Kozioł:
- https://maximator-fpga.org/examples/
- https://maximator-fpga.org/wp-content/uploads/2017/03/maXimator-HDMI-test.zip
- https://youtu.be/agKPjtTc7_g
Once you have programmed the Snō with the XLR8Build 'bootloader', the blue status LED (D13) will blink a heartbeat at 1Hz.
The examples folder contains a very simple test .ino which will allow you to change the volume of the sawtooth sound.
- https://www.aloriumtech.com/sno-quickstart/
- https://www.aloriumtech.com/documents/Sno_Pin_Map.pdf
- https://www.aloriumtech.com/sno-support/
- https://www.aloriumtech.com/openxlr8/
- https://www.aloriumtech.com/xcelerator-blocks/
- https://www.aloriumtech.com/webinars/
The Intro to OpenXLR8 webinar contains a lot of useful information. You will need to watch that if you are using Snō and XBs for the first time.
You will need a suitable HDMI Breakout or cable to connect the Snō pins to the HDMI port on your TV/Monitor, e.g.:
| Signal | HDMI Pin | Snō Pin |
|---|---|---|
| TMDS D2+ | 1 | D28 |
| TMDS D2S | 2 | GND |
| TMDS D2- | 3 | D34 |
| TMDS D1+ | 4 | D35 |
| TMDS D1S | 5 | GND |
| TMDS D1- | 6 | D22 |
| TMDS D0+ | 7 | D23 |
| TMDS D0S | 8 | GND |
| TMDS D0- | 9 | D29 |
| TMDS CLK+ | 10 | D30 |
| TMDS CLKS | 11 | GND |
| TMDS CLK- | 12 | D36 |
| Shield | GND |
The Snō requires 3.3V power. Connecting it to 5V will damage it. Please make sure you are using one of the recommended FTDI cables to provide power for the board.
Sameer Puri's HDL Utils are dually-licensed under the MIT and Apache 2.0 licenses
The parts written by Alorium Technology are licensed under the MIT license
The parts written by Paul are licensed under the beerware license:
- This code and connection guide is public domain but you buy me a beer if you use it and we meet someday
Enjoy!
Paul