Virtex HDL

This repository contains the Xilinx Vivado project for the Artix-7 (XC7A35T-1FTG256C) FPGA on Virtex. See 34-Engineering/Virtex-PCBs for wiring/setup. All FPGA code is written in SystemVerilog.

Description

The FPGA handles the following tasks:

1. Automatic Configuration, Reconfiguration, & Tempturature Shutoff over an SPI Interface with the Python 300 Image Sensor
2. 576Mb/s LVDS Interface through SerDes with the Python 300
3. Run Length Encoding & Frame Buffering of Python 300 Image Data
4. Real-time Vision Processing (Blob Making & Target Selection) from Python 300 Image Data
5. Configuration, Enabling, & Target Reading over external Virtex SPI Interface
6. Async FT245 FIFO Interface with FT2232H USB 2.0 IC to the 34-Engineering/Virtex-App
7. IR LED and RGB LED Bar Control with Fault Tolerance
8. EEPROM SPI Interface for Saving Virtex Configurations
9. JTAG Boundry Scan to Flash Memory Interface

Nomenclature

Blob: an isolated white region in the image

• Bounding Box: the minimum non-rotated rectangle that covers all pixels in the blob
• Quad: a quadrilateral made from the four most extreme points in the blob (used for angle calculations)

Target: a blob or group of blobs that represent the entire physical target

Kernel: a line of 8 horizontal pixels (native to the Python 300)

Source

Virtex-HDL.srcs/sources_1/new: source modules; only these files are synthesized into the FPGA bit file

• Top.sv: top (main) module for the FPGA source code

Virtex-HDL.srcs/sim_1/new: sim modules; used to simulate the hardware that the source modules interact with (Python 300, FT2232H, etc.)

• TopSim.sv: top simulation file for executing a global test of the entire FPGA

Virtex-HDL.srcs/test_1/new: test modules; used to confirm that every module is working correct

• TopTest.sv: top test file for executing unit tests on every module

Virtex-HDL.srcs/constrs_1/new/Virtex.xdc: master contrains file mapping ports in Top.sv to physical BGA pads

Simulating & Building

All simulating, synthesis, implementation, and bitstream generation is done through Vivado 2021.

VSCode Setup (Windows 10/11)

1. Add VSCode to PATH (ex C:\Users\liams\AppData\Local\Programs\Microsoft VS Code\bin), and ensure code . works in the command line

2. Download Universal Ctags, add it to PATH (ex D:\Program Files (x86)\ctags), and ensure ctags works in the command line

3. Download Xilinx Vivado, add the following enviornment vairables, and ensure xvlog works in the command line

   • PATH
     • C:\Xilinx\Vivado\2021.1\bin
     • C:\Xilinx\Vivado\2021.1\lib\win64.o
     • C:\Xilinx\DocNav
     • C:\Xilinx\Model_Composer\2021.1\bin
     • C:\Xilinx\Vitis_HLS\2021.1\bin
   • XILINX_HLS = C:\Xilinx\Vitis_HLS\2021.1
   • XILINX_VIVADO = C:\Xilinx\Vivado\2021.1

4. Install the Verilog VSCode Extension and configure settings

   • Set verilog.ctags.path = ctags
   • Set verilog.linting.linter = xvlog

5. (Optional) Run set_param general.maxThreads 8 in the Vivado TCL console to reduce Synthesis time.

Questions

If you have any questions feel free to contact info@34engineering.com or liamsnow03@gmail.com

Flashing with Open OCD

openocd --file ocd.cfg