FPGA_HW_SIM_FWK_2

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FPGA_HW_SIM_FWK_2

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FPGA Hardware Simulation Framework

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# FPGA_HW_SIM_FWK_2

FPGA Hardware Simulation Framework 2.2

Simulate hardware containing an FPGA interactively!
The concurrent simulation of stimulus and results is straight forward, "real" threads can be used to test realistic situations which are otherwise not possible with standard VHDL or Verilog simulation tools.
The simulation framework replaces the FPGA chip itself, as well as peripheral components and external devices.

- includes generation of .exe file!
  - includes "synchronized" connection to [circuitjs](https://www.falstad.com/circuit/) over websockets!
  
    (the circuitjs simulation may even be run in a separate computer).
  - links:

- [video1](https://youtu.be/OznmQC0OJ48)
    - [video2](https://youtu.be/F2Q6Gl9-56A)
    - [old article in Code Project](https://www.codeproject.com/Articles/5329919/FPGA-Hardware-Simulation-Framework-FPGA-HW-SIM-FWK "FPGA_HW_SIM_FWK Article in Code Project")
    - [old project in GitHub](https://github.com/ClarkFieseln/FPGA_HW_SIM_FWK)

## Simulate hardware containing an FPGA programmed in VHDL interactively!

![plot](https://raw.githubusercontent.com/ClarkFieseln/FPGA_HW_SIM_FWK_2/main/img/simulation.png)

## Architecture overview

![plot](https://raw.githubusercontent.com/ClarkFieseln/FPGA_HW_SIM_FWK_2/main/img/architecture_overview.png)

## Framework GUI

![plot](https://raw.githubusercontent.com/ClarkFieseln/FPGA_HW_SIM_FWK_2/main/img/fpga_gui.png)

## FPGA_HW_SIM_FWK_2 (demo videos)

- [video1](https://youtu.be/OznmQC0OJ48)
  - [video2](https://youtu.be/F2Q6Gl9-56A)

## Dependencies
To install dependencies go to python\hw_sim_fwk_2 and type:

> pip_install_requirements.bat
  
To install the designer tool type:

> pip install pygubu-designer
  
## Executable file (approx. 29MB, all included!)
To generate and run an executable file go to python\hw_sim_fwk_2 and type:

> gen_and_run_exe.bat

This only takes a moment to complete.

## New example
The VHDL code (e.g. VIVADO) sets the frequency of the output voltage generated by the application board ("sig-gen" in python app) which drives the input voltage of the transformer (circuitjs).

The output voltage of the transformer (circuitjs) is then read by the application board ("ADC" in python app) and input to the VHDL code using 10 digital inputs (VIVADO).
The frequency can be changed using the push button B0.

The closed simulation loop runs "in sync" thus making sure that all models are consistent.

Note: simulating in sync with circuitjs is slower than the other options (random, counter, input file), e.g. 1500 Hz i.o. 5000 Hz.

## Summary
This tool provides the following features, usually not supported by standard simulation methods:
  - GUI
  - concurrent input / output
  - interactive user experience with emulated HW
  - synchronized communication interface between App and VHDL-Simulator based on named pipes (FIFOs)
  - synchronized communication interface between App and [circuitjs](https://www.falstad.com/circuit/) based on websockets
    (synchronization is achieved using the original/unmodified circuitjs websocket API)
  - any combination of simulation sources allowed: VHDL testbench, Python script, circuitjs model
    (the circuitjs model needs at least some python script as a "bridge" to the VHDL DUT)
  
The stimulus and results exchanged between the Simulation App written in Python and the
VHDL Simulation Tool (any tool supporting VHDL 2008), are fast enough to produce a realistic and interactive HW behavior.
The rate of data exchanged between Simulation App and circuitjs is also very high.

The current project is an improvement of an earlier project which has been optimized for performance.
Signals beyond some frequency, which depends on the specific configuration and the used computer, will no longer be processed in real-time but the simulation will still be very fast.

In order to support simulation of "asynchronous" signals, the current rate of the simulation clock is reduced to 1/4th. But the overall simulation rate continues to be the maximum in "turbo mode" because the signals are exchanged in 4 different clock phases within each clock period.

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