yosys4gal/extractions/README.md

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Extractions
===========
All the yosys extraction pass Verilog file used for mapping to the GAL
structure. See the `synth_gal.tcl` file for details on how they're used. A
summary is below (in the order they're used):
- `ndff.v` merges NOT gates and DFFs into a single cell. Used to set the active
high/low state of the GAL_OLMCs later
- `tristate.v` merges tristate cells and NOT gates or tristate cells and DFFs.
Used to combine tristate functionality into the GAL_OLMCs later