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10/5/2025 11 AM - Started making the Schematic

Hello, World! I settled down to a ICE40UP5K-SG48I since it has a QFN package and an OK number of LUTs Found a crystal suitable for the fpga, and started building the power rails. I also tried making a power supply filter, but I can't seem to add ferrite beads to the schematic (I'm using Easyeda Pro). Screenshot From 2025-10-05 11-37-35.png Note that the voltage regulators are still to be chosen, since I want to power an rp2350 on the same board too.

10/5/2025 9 PM - Habemus schematic!

INSANE rp2350 && ice40 schematic speedrunning session Just mostly need to get the 40-pin connector in-place I still have to find the perfect ferrite bead image.png image.png I also need to add an SPI and UART connection between the rp2350 and the ice40.

By the way, you might be wondering what are those strangely-routed USB and USBc female ports are for, and I will be using those to see if I can make my own TCP/IP stack on the fpga, as a nice side-quest.

10/21/2025 - Routed?

Today I changed switched of my capacitors to be 0402, I also placed the components on the pcb and routed them, for the most part.

I also decided I will use a 4 layer board with Signal-GND-3v3?-Signal layout. I have a few doubts if I have positioned the inductors for the rp2350 regulator correctly Did some of the work in class because I was bored =D

image.png

10/26/2025 - Routing session #2

image Re-did the wiring of some of my components, added routing to the headers I have yet to find the use for 10 pins also to add is a nice reset button for the fpga and maybe a programming port

10/30/2025 - The end?

image

Hi fellow readers, today I added 4 small neopixels on the top-right of my board, fixed some of my extremely janky routing for the headers, added some debug headers for the rp2350 and a button to reset the ice40.

I am most likely finished with this board, just needs some polishing and some silkscreen art :)

11/3/2025 - smol update

image Fellow readers, we have reached the end, wanted to show you a final pcb screenshot of the wiring, I routed cdone and reset pins out to the headers to be able to program it. Here follow the rest of the pcb stackup image image image