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- [](https://github.com/tmeissner/formal_hw_verification/actions?query=workflow%3ATest)
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- The original repository is located on my own git-server at [https://git.goodcleanfun.de/tmeissner/formal_hw_verification](https://git.goodcleanfun.de/tmeissner/formal_hw_verification)
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- It is mirrored to github with every push, so both should be in sync.
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- # formal_hw_verification
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- Tests and examples of using formal verification to check correctness of digital hardware designs. All tests are done with [SymbiYosys](https://github.com/YosysHQ/SymbiYosys), a front-end for formal verification flows based on [Yosys](https://github.com/YosysHQ/yosys).
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- All stuff in the master branch uses [ghdl-yosys-plugin](https://github.com/ghdl/ghdl-yosys-plugin) and [GHDL](https://github.com/ghdl/ghdl) as VHDL front-end plugin for (Symbi)Yosys. Using GHDL as synthesis frontend allows using PSL as verification language. The alu, counter & vai_reg designs can be verified with that combination at the moment.
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- Some examples in the [verific branch](https://github.com/tmeissner/formal_hw_verification/tree/verific) use the commercial VHDL/SystemVerilog frontend plugin by Verific which isn't free SW and not included in the free Yosys version. See on the [Symbiotic EDA website](https://www.symbioticeda.com) for more information.
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- You can use the `hdlc/formal:all` docker image provided by the [hdl containers project](https://hdl.github.io/containers/) (recommended). Or you build a docker image on your own machine using my [Dockerfiles for SymbiYosys & GHDL](https://github.com/tmeissner/Dockerfiles). With both you have the latest tool versions available.
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- ### alu
- A simple ALU design in VHDL. The formal checks contain various simple properties used by assert & cover directives which are proved with the SymbiYosys tool.
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- ### counter
- A simple counter design in VHDL. The testbench contains various simple properties used by assert & cover directives which are proved with the SymbiYosys tool.
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- ### fifo
- A simple synchronous FIFO with various checks for write/read pointers, data and flags.
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- ### vai_fifo
- A simple FIFO with valid-accept-interface. Consists of fifo as sub-unit and some glue logic doing fifo<->vai interface conversion. This design serves as an example how to verify designs with sub-units containing formal checks.
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- ### vai_reg
- A simple register file with VAI (valid-accept-interface) which serves as test design to try formal verification of FSMs.
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