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Arachne-pnr by Cotton Seed (who also uses pseudonyms cseed and mian2zi3) is an open-source FPGA placement and routing tool for Lattice iCE40 FPGAs.  It's a companion to the open-source Project IceStorm by Clifford Wolf and Mathias Lasser, which has reverse-engineered the iCE40 bitstream. The usual design flow for IceStorm is to synthesize Verilog source code using Clifford Wolf's Yosys to produce a netlist in the form of a Berkeley Logic Interchange Format (BLIF) file.  Arachne-pnr p ...

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