VGA Clock

simple project to show the time on a 640x480 VGA display.

Simulation instructions

Ensure that you have libsdl2-dev and verilator installed.

sudo apt-get install libsdl2-dev libsdl2-image-dev verilator

To run the simulation use the following commands:

cd rtl
make verilator && ./obj_dir/Vvga_clock

Use the h, m and s keys to increment the hour, minute and second counters respectively.

FPGA Build instructions

It's setup to run on 1 Bit Squared icebreaker with my VGA pmod plugged into pmod1a.

type

make prog

to build & upload to the icebreaker

FPGA utilisation

using logLUTs to record resource usage and max frequency over commits:

ASIC utilisation

https://www.zerotoasiccourse.com/post/vga_clock/

using the Skywater/Google 130nm process and OpenLane

• copy contents of rtl directory to designs/vga_clock/src/
• remove digit_tb.v and top_tb.v from designs/vga_clock/src/ (I am working on separating test and rtl)
• copy asic/config.tcl to designs/vga_clock/
• inside the docker environment:
  • run ./flow.tcl -init_design_config -design vgaclock
  • run ./flow.tcl -design vga_clock

This results in a routed design that uses 180x180 microns.

See asic/Makefile for some rules that start the docker and show the finished GDS in magic or klayout.

License

This software and hardware is licensed under the Apache License version 2