BOM optiimisation!

I uhh changed the LEDs from 0402 Extended to 0603 basic and uhm i changed how they were placed on the board and i will now be using the C9002 crystal, thanks Kai! Will update the BOM and the costs. Here are the new images:

Branding+BOM

Okay, i did the branding for the board, it looks really cool!

I mainly added resistor values as well as branding. the font i used is just a spacex clone because it looks really cool. uhh yea i am gonna make BOM next and i hope it works!
I reoriented the PCB to so it looks better in the PCB editor.

PCB Complete!

I completed the PCB. Changed a few nets, added a 10uF cap for the 1.2v rail. added all the different 3d models, and idk why but it was a pain to find the RP2350A 3d model. About everything is complete, will finish beautifying the repo and make the BOM and senD it! Check out the Images:

Removed silkscreen references + removed excess routes

removed extra traces like random traces connecting 3v3 because i switched to 4 layers(made the routing so much easier as there were a few nets that were impossible to route). i made the PCB better overall. GPIO headers are yet to be added and i will add them later today. i also have to find a suitable resistor and add it's value. and yeah i have to add 3d models too along with branding and naming.

Finished PCB routing

okay, I finally completed the PCB.. I can ship it just now after making the BOM and beautifying the repo but no, i choose to make the dev board better, fix a lot of mistakes prolly and add all the 3d models. i want this project to be as polished as possible from my side. I still have to assign values to a resistor or two and i'll do that later too. Here's some images:

Started with the PCB routing

I started with the PCB routing, and i am aiming for a 2 layer PCB because idk. But like i am facing a lot of issues with routing, it is real hard to route. The two ICs make it a lot lot harder to route. i have yet not placed and routed with the power part of the board because that is a pain and the bottom part of the PCB looks beautiful but a lot of routing is left there too. will prolly do it later.

Schematic Done!

Yes, i finished the schematic, and i changed my flash to W25q128JVP instead of W25q128JVS because the JVS was too big for the board and JVP is significantly smaller and thus helps with space. i have realised that the board will be very tightly made and i will have to choose assembly as the items are placed very very closely. i have added a lot of LEDs too to not not use any GPIO pin. as well as i have 8 wires connecting the two semiconductors together. i still have to search for suitable LEDs and then assign resistor values.

Started with the schematic + minor placement

umm yeah, i started with the schematic for the devboard, it went well.

first i couldn't figure out some things like different voltages and i was concerced if i would need 2.5 volts too. but some wise people on the internet told that i can tie the VPP_2V5 pin to 3.3v directly. so yeah here it is.

and i think i will have to share a lot of GPIO to output to the headers. the space is very very small.

here's how the power part(dual buck converter) looks like:

I basically wired the basics of FPGA and the rp2350a. now in the next sesh i will connect both the chips and add headers and hopefully i will be done with the schematic.

Idea Changed

There are some things i want to change, first of all, i cannot figure out how to program the FPGA, as there are two ways, first you use a flash configured where the FPGA is the SPI master and the second is programming from an external MCU, where the FPGA acts as a slave. So i have an idea, I WILL USE THE RP2350 along with the FPGA. So yes, the board cost will be upped a little bit ig. i will still try to maintain the rpi pico form factor and use all the GPIOs, but if it is not possible then also it is fine as i will have many many GPIOs.

here are other things that i have decided to put:
1x RGB LED.
4x normal LEDs
2x power LEDs(3.3v and 1.2v both)
a buck convertor with 2 channels (most probably RT8075ZQW)

it would look something like this:

deciding stuff

so, i have decided that i will be making an FPGA dev board in a raspi pico form factor, which will have the ice40up5k FPGA with 5280 LUTs. Here are some other things that i will need:

• A programming interface
• a flash storage
• cramming everything in rpi pico form factor
• USB-C
• required voltage regulators(3.3v and 1.2v prolly)
• too many LEDs(with suitable resistors) Yeah that's all ig and yes no castellations because they are expensive, and i'll solder the board myself at home yay