cc @latticesemi: Reasons people use iCE40 FPGAs.https://twitter.com/GregDavill/status/979883322389098497 …
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On a side note – and not really relevant for my decision: A pretty neat feature of the iCE40 family is, that you can actually "burn" program them. I.e. they have one-time-programmable configuration memory. Useful if you have a thorougly tested design and want it to be instant-on.
jfyi: It's *not* instant-on. The device still transfers the configuration data from NVCM to SRAM during power-on.
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Thanks for the clarification. How many µs?
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Depends on the bitstream size and the "internal oscillator frequency" setting contained in the bitstream header. The bitstream size in turn not only depends on the device type but also on whether the bitstream includes bram init data (and how much of it).
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