adamse/fpga

FPGA experiments

Resources for Digilent Basys 3

Digilent Basys 3, built on Artix-7, specifically XC7A35T-1CPG236C.

• Basys 3 overview: https://reference.digilentinc.com/reference/programmable-logic/basys-3/start
• Basys 3 reference manual: https://reference.digilentinc.com/reference/programmable-logic/basys-3/reference-manual
• Basys 3 schematics: https://reference.digilentinc.com/learn/documentation/schematics/basys-3-schematic
• Xilinx series 7 datasheet: https://reference.digilentinc.com/learn/programmable-logic/doc/datasheets/7-series-fpgas-overview

Installing Vivado

Things from Vivado are needed for project "X-Ray" to generate the bitstream for programming the FPGA.

1. Download the full install for 2017.2 (~20GB). https://www.xilinx.com/member/forms/download/xef.html?filename=Xilinx_Vivado_SDK_2017.2_0616_1.tar.gz

2. On Ubuntu I need libtinfo5 for the installer to complete

   • apt-get install libtinfo5

3. Extract Xilinx_Vivado_SDK_2017.2_0616_1.tar.gz

   • tar --exclude "*win64*" -xvf ./Xilinx_Vivado_SDK_2017.2_0616_1.tar.gz

     to skip some windows files we don't care about (smaller unpack)

4. Run ./xsetup and select the device types you need.

Install cable drivers

Needed for vivado to find the device.

# wherever I installed vivado
$ ~/opt/Xilinx/Vivado/2017.2/data/xicom/cable_drivers/lin64/install_script/install_drivers/install_drivers

INFO: Installing cable drivers.
INFO: Script name = ./install_drivers
INFO: HostName = tpa
INFO: Current working dir = /home/adam/opt/Xilinx/Vivado/2017.2/data/xicom/cable_drivers/lin64/install_script/install_drivers
INFO: Kernel version = 5.8.0-26-generic.
INFO: Arch = x86_64.
Successfully installed Digilent Cable Drivers
--File /etc/udev/rules.d/52-xilinx-ftdi-usb.rules does not exist.
--File version of /etc/udev/rules.d/52-xilinx-ftdi-usb.rules = 0000.
--Updating rules file.
--File /etc/udev/rules.d/52-xilinx-pcusb.rules does not exist.
--File version of /etc/udev/rules.d/52-xilinx-pcusb.rules = 0000.
--Updating rules file.

INFO: Digilent Return code = 0
INFO: Xilinx Return code = 0
INFO: Xilinx FTDI Return code = 0
INFO: Return code = 0
INFO: Driver installation successful.
CRITICAL WARNING: Cable(s) on the system must be unplugged then plugged back in order for the driver scripts to update the cables.

Setup SymbiFlow

TBD.

Guide at https://symbiflow.readthedocs.io/en/latest/symbiflow-arch-defs/docs/source/getting-started.html.

git clone https://github.com/SymbiFlow/symbiflow-arch-defs.git
cd symbiflow-arch-defs
make env
cd build/xc/xc7/tests/counter
make counter_basys3_bit