The December release of Tabby CAD Suite is now available for download. Notable changes in this version include:

• We have improved support for SystemVerilog config elements. You can now have multiple configurations defined, and select which configuration to elaborate with verific -import <configname>.
• We are working on improving the TCL integration in Yosys. There is now an interactive TCL shell mode: use yosys -C to enter the TCL shell. You can now also use the following command to get the output of a command returned to TCL without the use of an intermediate file: set command_output [yosys tee -s result.string <command>]

# In other YosysHQ news

• We had another great guest blogpost from Tom Verbeure. He wrote about how Yosys does techmapping, in particular logic primitive transformations. If you’ve not read any of Tom’s other writing, he has a very interesting index here. Two of our favourites are Post-Simulation Waveform-Based RISC-V with GDB and Cosimulating Verilog and VHDL with CXXRTL.
• We are starting a ‘community spotlight’ feature to help highlight useful open source EDA tools. If you have a tip, please let us know.