Good Stuff Department
The ButterStick is an FPGA development board. Building off the OrangeCrab, the Butterstick's primary focus is exposing lots of fast I/O pins. To achieve this goal it makes use of the SYZYGY peripheral connector standard. The board features High-speed USB and Gigabit Ethernet for high-speed input/output to a computer. Additionally there is up to 1 GB of onboard DDR3 memory.
The development board makes use of the ECP5 FPGA from Lattice which is fully compatible with the open-source FPGA synthesis flow.
ButterStick-r1.0-8G-85F | ------------------------|
2x MT41K256M16TW-107 |
The groupbuy will facilitate the funds required to make a production batch of these boards.
One Butterstick FPGA
Not available / campaign funded, end date: Fri, 29 Jan 2021 13:00:00 PST
Basic breakout/prototype board
Design subject to change
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Tim Michals @tcmichals was kind enough to point out the large collection of compatible(?) boards: https://syzygyfpga.io/peripherals/
All, we have some good news and really good news if you backed the lower cost 25F version. There were so few orders for the 25F that it didn't make sense to even build it. That type of market intelligence is one of the strengths of a GroupGet campaign - you get to see what is working or not really quickly. What we have done in response is removed it as an option. If you were one of the few who backed it, you will get the 85F at no extra charge so congrats to you. As a result of this move, we have also been able to lower the minimum buy so now we're close to funding and we have no doubt that we will hit over 100% by Jan 28.
And well said above Tommy! Greg is very busy but I know that he has plans to do that.
Some exciting news! As many of you are aware, 2020/2021 has seen some pretty significant chip shortages and supply chain issues. But we've got all but one part needed to push the ButterStick boards through the PnP line and get assembled boards out the other side.
The part in question is a somewhat exotic power MUX IC. The TPS2121. Unfortunately it doesn't appear to available anytime soon, ETA on our back order back in Feb have slipped a couple of times. So we've decided to remove the IC from the design. Which means we can start production next week, but also means you can only power the board over USB or Externally. But not both at the same time now.
I feel like this is a reasonable compromise in order to get boards out into peoples hands this year.
You can see the technical details of the change here: https://github.com/butterstick-fpga/butterstick-hardware/tree/main/hardware/ButterStick_r1.0/Production/ECN/ECN_001
Tommy: It's recommended to remove external power if connecting USB. This is due to the backfeeding current from 'ext 5V' back into a USB port. Or you could use a USB cable with the +5V line removed.)
Attie: Yep, you can totally remove the 0603 and then bridge either external or USB power across.
Another option: once the chips are available (~mid 2022) I'd be happy to rework chips any of the groupbuy boards. You'd just need to cover shipping.
Written by: Griffin | December 10, 2021
If you don't plan to use the SD card slot, you can ignore this update.
An issue with U3 is causing the SD card reader to not work.
U3 is a TVS diode for anti-static protection. The SD card reader will work if this IC is removed.
This can be accomplished with a hot air rework station.
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