Problem with cheap EOS3 BGA64 design

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goran-mahovlic
Posts: 3
Joined: Fri Feb 12, 2021 7:57 am

Hi to all!

I bought EOS3 BGA on CrowdSupply and as II started to work on my board I discovered that it would be hard to make it at low price.
If I would do it correctly I would need to use small vias, probably buried vias so for few boards that did not make sense to me...
But as I still wanted board I had some idea to do it hacky way.
If I do not use VIA under BGA then all will be good and cheap.

I tough that one of two approaches should work.
First idea was to use just the pins I need - and not to place pads for the pins I do not need.

But then I looked at the datasheet and as I discovered some pins in datasheet some pins would not mind if they are connected on startup I used other approach.
Connected some pins together so if that would work I could use more pins at the end...
EOS3.jpeg
EOS3.jpeg (153.81 KiB) Viewed 222 times
I ordered board from OshPark -

https://oshpark.com/shared_projects/bjR6vplZ

I assembled board and start to study tool chain.
Finally understood how to "compile" everything, but I run on the issue.

https://github.com/QuickLogic-Corp/qorc-sdk/issues/86

Problem is that I can load fw to board, but LED does not blink and if I connect to debug board I see
DBG.png
DBG.png (102.03 KiB) Viewed 222 times
Problem is that now I an stuck as I tried many things in software, and I am not sure that HW is done right.
So if someone who knows architecture could check my board and schematics for things I did bad - that would really help me to get i running.
Quick_BGA_soldered_L.jpg
Quick_BGA_soldered_L.jpg (76.58 KiB) Viewed 222 times
Board is here: Cheap version QuickBGA64_cheap.pro is the one I am referring to, as in the same repo there is other unfinished board...

https://github.com/intergalaktik/QuickL ... QuickBGA64

Board now has all parts on, with addition of BOOT jumpers and LED on other pin for testing...
goran-mahovlic
Posts: 3
Joined: Fri Feb 12, 2021 7:57 am

EOS3_L.jpg
EOS3_L.jpg (30.3 KiB) Viewed 211 times
anthony-ql
Posts: 49
Joined: Thu Jun 04, 2020 1:26 am

Found your post. I will look at the schematic and layout and give you feedback in 1 week time.
georgefernandis
Posts: 1
Joined: Thu Apr 08, 2021 12:09 pm

Thanks........
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