![]() The dev board features the "4K" CLB ICE40 Ultra silicon, the largest version offered (actually, it's like 3.8K CLB but never mind). But there is quite a long list of confusions and puzzlements about it and its software. ![]() The dev board is nice and cheap at USD50 from Digikey. To be fair some of it is the usual problems about shipping Linux binaries but many of the issues are completely self-inflicted by Lattice. I decided to write an article about it because there are numerous puzzling things about their dev kit and even after spending a day on it, what I found should certainly help other victims. The cheapest FPGAs are now becoming competitive on price with the old CPLDs, this article discusses a new variant of Lattice's ICE40, ICE5 or "ICE40 Ultra". ![]() However the cheapest ones are very resource-starved and there is little room for tricks with their crossbar structure. In terms of price the cheapest way to get usable amounts of programmable logic is still the ancient cpld.
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