Cross-Network Cosimulation

Why Perform Cross-Network Cosimulation?

You can perform cross-network cosimulation when your setup comprises one machine running MATLAB^® and Simulink^® software and another machine running the HDL simulator. Typically, a Windows^®-platform machine runs the MATLAB and Simulink software, while a Linux^® machine runs the HDL simulator. However, these procedures apply to any combination of platforms that HDL Verifier™ and the HDL simulator support.

Vivado^® cosimulation runs as a single process with a shared DLL, and therefore does not support cross-network cosimulation.

Preparing for Cross-Network Cosimulation

Before you cosimulate between the HDL simulator and MATLAB or Simulink across a network, perform the following steps:

1. Create your design and testing files.

    ModelSim Users

   • Create and compile your HDL design, and create your MATLAB function (for MATLAB cosimulation) or Simulink model (for Simulink cosimulation).

   • If you are going to cosimulate with Simulink, use the -voptargs=+acc flag when you compile so that the design is not optimized, and include the same flag when you issue the vsim command (see Performing Cross-Network Cosimulation Using Simulink). Using this flag retains some unused signals from the design which are required by the Simulink model to run and display the results.

    Xcelium Users

   Create, compile, and elaborate your HDL design, and create your MATLAB function (for MATLAB cosimulation), or Simulink model (for Simulink cosimulation).

2. Copy HDL Verifier libraries to the machine with the HDL simulator

   1. Go to the system where you installed MATLAB. Then, find the folder in the MATLAB distribution where the HDL Verifier libraries reside.

      You can usually find the libraries in the default installed folder:

      matlabroot/toolbox/edalink/extensions/adaptor/platform/productlibraryname_
      compiler_tag.ext

      where the variable shown in the following table have the values indicated.

      Variable	Value
      matlabroot	The location where you installed the MATLAB software; default value is MATLAB/version where version is the installed release (for example, R2009a).
      adaptor	incisive or modelsim
      platform	The operating system of the machine with the HDL simulator, for example, linux32. (For more information, see Cosimulation Libraries.)
      productlibraryname	The name of the library files for MATLAB and for Simulink (for example, liblfmhdlc, liblfmhdls for ModelSim® users; liblfihdlc, liblfihdls for Xcelium™ users). See Cosimulation Libraries.
      compiler_tag	The compiler used to create the library (for example, gcc32 or spro). For more information, see Cosimulation Libraries.
      ext	dll (dynamic link library—Windows only) or so ( shared library extension)

      For a list of all the HDL Verifier HDL shared libraries shipped, see Default Libraries.

   2. From the MATLAB machine, copy the HDL Verifier libraries you plan to use (which you determined in step 2) to the machine where you installed the HDL simulator. Make note of the location to which you copied the libraries; you'll need this information when you are actually establishing the connection to the HDL simulator. For purposes of this example, the sample code refers to the destination folder as HDLSERVER_LIB_LOCATION.

If you now want to cosimulate with MATLAB, see Performing Cross-Network Cosimulation Using MATLAB. If you want to cosimulate with Simulink, see Performing Cross-Network Cosimulation Using Simulink.

Performing Cross-Network Cosimulation Using MATLAB

To perform an HDL-simulator-to-MATLAB cosimulation session across a network, follow these steps:

 ModelSim Users

1. In MATLAB, get an available socket using hdldaemon:

   hdldaemon('socket',0)

   Or assign one (that you know is available):

   hdldaemon('socket',4449)

2. On the machine with the HDL simulator, launch the HDL simulator from a shell with the following command:

   vsim -foreign "matlabclient /HDLSERVER_LIB_LOCATION/library_name;" design_name

   where the arguments shown in the following table have the values indicated.

   Argument	Value
   library_name	The name of the library you copied to the machine with the HDL simulator (in Preparing for Cross-Network Cosimulation).
   design_name	The VHDL® or Verilog® design you want to load

3. In the HDL simulator, schedule the test bench or component (matlabcp or matlabtb). Specify the socket port number from step 1 and the name of the host machine where hdldaemon is running.

 Xcelium Users

1. In MATLAB, get an available socket using hdldaemon:

   hdldaemon('socket',0)

   Or assign one:

   hdldaemon('socket',4449)

2. Create a MATLAB configuration file (for loading the functions used in the HDL simulator) with the following contents:

   //Command file for MATLAB HDL Verifier.
   //Loading of foreign Library and HDL simulator functions.
   
   
   -loadcfc /HDLSERVER_LIB_LOCATION/library_name:matlabclient
   //TCL wrappers for MATLAB commands
   -input @proc" "nomatlabtb" "{args}" "{call" "nomatlabtb" "\$args}
   -input @proc" "matlabtb" "{args}" "{call" "matlabtb" "\$args}
   -input @proc" "matlabcp" "{args}" "{call" "matlabcp" "\$args}
   -input @proc" "matlabtbeval" "{args}" "{call" "matlabtbeval" "\$args}
   

   Where library_name is the name of the library you copied in Preparing for Cross-Network Cosimulation. You may name this configuration file anything you like.

3. On the machine with the HDL simulator, launch the HDL simulator from a shell with the following command:

   xmsim -gui -f matlab_config_file design_name

   where the arguments shown in the following table have the values indicated.

   Argument	Value
   matlab_config.file	The name of the MATLAB configuration file (from step 3)
   design_name	The VHDL or Verilog design you want to load

4. In the HDL simulator, schedule the test bench or component (matlabcp or matlabtb). Specify the socket port number from step 1 and the name of the host where hdldaemon is running.

Performing Cross-Network Cosimulation Using Simulink

When you want to perform an HDL-simulator-to-Simulink cosimulation session across a network, follow these steps:

 ModelSim Users

1. Launch the HDL simulator from a shell with the following command:

   vsim -foreign "simlinkserver /HDLSERVER_LIB_LOCATION/library_name;
       -socket socket_num" -voptargs=+acc design_name

   where the arguments shown in the following table have the values indicated.

   Argument	Value
   library_name	The name of the library you copied to the machine with the HDL simulator (in Preparing for Cross-Network Cosimulation).
   socket_num	The socket number you have chosen for this connection
   design_name	The VHDL or Verilog design you want to load

2. On the machine with MATLAB and Simulink, start Simulink and open your model.

3. Double-click on the HDL Cosimulation block to open the Function Block Parameters dialog box.

4. Click on the Connections tab.

   1. Clear “The HDL simulator is running on this computer.” HDL Verifier changes the Connection method to Socket.

   2. In the text box labeled Host name, enter the host name of the machine where the HDL simulator is located.

   3. In the text box labeled Port number or service, enter the socket number from step 1.

   4. Click OK to exit block dialog box, and save your changes.

 Xcelium Users

1. Launch the HDL simulator from a shell with the following command:

   xmsim -gui -loadvpi "/HDLSERVER_LIB_LOCATION/library_name:simlinkserver"
       +socket=socket_num design_name

   where the arguments shown in the following table have the values indicated.

   Argument	Value
   library_name	The name of the library you copied to the machine with the HDL simulator (in Preparing for Cross-Network Cosimulation).
   socket_num	The socket number you have chosen for this connection
   design_name	The VHDL or Verilog design you want to load

2. On the machine with MATLAB and Simulink, start Simulink and open your model.

3. Double-click on the HDL Cosimulation block to open the Function Block Parameters dialog box.

4. Click on the Connections tab.

   1. Clear the check box labeled The HDL simulator is running on this computer. HDL Verifier changes the Connection method to Socket.

   2. In the Host name box, enter the host name of the machine where the HDL simulator is located.

   3. In the Port number or service box, enter the socket number from step 1.

   4. Click OK to exit block dialog box, and save your changes.

Next, run your simulation, add more blocks, or make other desired changes. For instructions on using Simulink and the HDL simulator for cosimulation, see Simulink as a Test Bench or Component Simulation with Simulink.