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diff --git a/readme.md b/readme.md deleted file mode 100644 index d13c3a0..0000000 --- a/readme.md +++ /dev/null @@ -1,50 +0,0 @@ -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. - |