cc @latticesemi: Reasons people use iCE40 FPGAs.https://twitter.com/GregDavill/status/979883322389098497 …
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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).
But all this equally effects the initialization time when loading from an external SPI flash in SPI master mode. So I would expect the power-on period to be about equal when using an external SPI flash or the built-in NVCM.
