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[enh] use Misc() properties in trellis' PCF#221
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Hmm, the idea behind |
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Currently Misc() properties are ignored when generating the pcf constraint file for trellis.
To keep compatibility with existing platforms, Lattice's Diamond properties are translated to nextpnr's.
Only PULLUP has been successfully tested (on icestick), but PULLUP_RESISTOR should be supported aswell, based on document found here (p91)
the IOStandard() properties are not supported by nextpnr, therefore nothing is done with them.