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-Ngspice Ghdl Interfacing Documentation 
-====
-
-It contains all the documenation for Ngspice and Ghdl related work.
-
-> Note: This project is in beta version and has been tested for rings, counters and PWM controllers.
-
-
-## How is Ngspice interfaced with GHDL?
-Ngspice supports mixed mode simulation. It can simulate both digital and analog components.
-
-Ngspice has something called code-model which defines the behavior of your component and can be used in the netlist. For example you can create a full-adder's code-model in Ngspice and use it in any circuit netlist of Ngspice.
-
-Now the question is if we already have digital model creation in Ngspice, then why this interfacing?
-
-Well, in Ngspice, it is difficult to write your own digital code-models. Though, many people are familiar with GHDL and can easily write the VHDL code.
-So the idea of interfacing is just to write VHDL code for a model and use it as a dummy model in Ngspice. Thus, whenever Ngspice looks for that model, it will actually call GHDL to get the results.
-GHDL's foreign language interface is used for this inter-process communication.
-
-
-## Pre-requisites
-1. Ubuntu 16.04-18.04 (You can try it on other version and let us know)
-2. GHDL (LLVM)-0.36
-3. Ngspice-31
-
-
-## How to install?
-This module is made available with eSim (Electronic Circuit Simulation). 
-Refer https://esim.fossee.in/ for more information.
-
-
-## Installed Code Structure
-1. Ngspice will be installed in home directory $HOME.
-2. Source code for all other file will be present in ~/.esim-nghdl
-3. symlink "nghdl" is stored in /usr/local/bin
-
-
-## Features
-1. Support for 512 digital models.
-2. Support for digital models upto 64 output ports/pins.
-3. Multiple instances of same digital model.
-
-
-## How to use the Examples provided with NGHDL?
-1. Launch eSim --> Click on "NGHDL" icon from the left toolbar --> Click on "Browse" button --> Go to ../nghdl/Example/
-2. Locate the example you wish to simulate, find the VHDL file within that example and click on "Open" button at the bottom of "Open File" window.
-3. Click on "Upload" button in the NGHDL window. File will be processed in the backend for few seconds. Now exit the NGHDL window.
-4. Open the desired example under eSim/Examples/NGHDL_Examples/ using the "Open Project" button, double click on the project when the project is loaded in the "Projects" window.
-5. Click on the "Simulation" button on eSim Main window.
-