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| im-tomu | [umarcor] Hi! I tried a couple of USB-Serial projects without much success. I adapted https://github.com/davidthings/tinyfpga_bx_usbserial to the Fomu, but nextpnr can not achieve more than 30MHz. I also tried LUNA, but it seems that some recent changes are failing to meet timing: https://github.com/greatscottgadgets/luna/pull/80. | 18:08 |
|---|---|---|
| im-tomu | @Sylvain, I read somewhere that you had achieved it with some tiny RISCV that took ~1K LUTs. Is that correct? | 18:08 |
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| tnt | It's more like 1.5k lut for a minimal riscv+usb core. | 18:50 |
| tnt | I'm hoping to use the SERV core to bring that down but haven't gotten around to it yet. | 18:51 |
| im-tomu | [umarcor] May I get some link to a repo/demo of that 1.5k design? | 18:53 |
| tnt | Nope sorry don't have it "as is". It was based on https://github.com/smunaut/ice40-playground/tree/master/projects/riscv_usb but with anything extra trimmed off to make is as small as I could ... just enough to enumerate and nothing else. | 19:03 |
| tnt | (so it wasn't all that useful ...). | 19:03 |
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