Oak-Development-Technologies / IcyBlue

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A few questions and suggestions #1

Open zapta opened 2 months ago

zapta commented 2 months ago

Hello, I found this nice board from your submission to apio and have a few random questions and notes for your consideration.

  1. Is the 12Mhz oscilator connected to the FPGA? If not, it may be useful.
  2. The FPGA datasheet mentions power rail sequencing. Have you considered it?
  3. You can add a few examples at https://github.com/FPGAwars/apio-examples . This way, apio users can run them using the apio examples command.
  4. Have you considered adding here instructions for installing apio and running a simple hello world?
skerr92 commented 2 months ago

Hi there,

To answer your questions:

  1. The distance between the 12MHz oscillator and the closest available FPGA pin is a bit far so connecting it might be troublesome. Given the board only goes up to 48MHz (which is difficult to achieve with complex designs), the onboard HFOSC and LFOSC are probably more than sufficient.

  2. Power up sequencing has never been an issue on this board. The recommendations are likely based on the assumption that the FPGA will be incorporated on board with more demanding power schemes. That isn't the case here.

  3. I can probably add examples, though I can give no time frame on when that will happen. Oak Development Technologies as a business has been shut down so there is no formal entity backing or selling this board anymore.

  4. Same with the third response, some instructions can be added for using APIO, but I guarantee no time frame right now.

Thanks! -Seth