AR# 57261

Xilinx HSSIO Solution Center - Design Assistant Digital Simulation of Serial Transceivers


Digital simulation should be performed to verify the behavior of the digital side of a transceiver as well as its interface to user logic.
To this end, the wizard provides wrappers around a digital simulation model of the transceiver with every generated core.

These primitives model transceiver behavior as closely as possible and provide realistic system behavior in simulations.
They can, and should, be used to accurately simulate transceiver bring-up, resets, and interaction with user logic.
For each core generated by the wizard, an example design is also included which allows for immediate simulation of the chosen transceiver setup.

Below is a guide to digitally simulating the example designs provided by the transceiver wizard.

What is presented below is an overview, for a more detailed discussion see the Vivado Design Suite User Guide: Logic Simulation(UG900).

We recommend using the Document Navigator in the latest Vivado Version to find this, or any, User Guide.

Note: This article is part of the Xilinx HSSIO Solution Center and is available to address all questions related to HSSIO.

Whether you are starting a new design or troubleshooting a problem, use the HSSIO Solution Center to guide you to the right information.


Example Design

directory/file structure
   coregen directory       - core files (.xco, .v[hd], _readme.txt, _flist.txt)
      core directory
         doc               - documentation
         example_design    - example design files
         implement         - implementation scripts
         simulation        - testbenches
            functional     - simulation scripts for example design
            netlist        - simulation scripts for implemented design

You can open an example design in the Vivado tool by right-clicking on designName.v and selecting Open IP example design.

Simulation start / simulators

Go into the functional directory and either run the simulation script simulate_[simulator].[sh|bat] (ISIM,XSIM,NC,VCS), or start the simulator and start the run script there (ModelSim)

From the Vivado tool, in the left side of the Project Manager panel, select simulation settings.

- testbench structure for Kintex GTX as an example:
      global reset
      clock settings/generation
         reset for supporting modules
         _gt_usrclk_source   - usrclk generation
         _gt_frame_gen       - frame generator to provide data stream for TX - gt_rom_init_tx.dat used
         _gt_frame check     - check of RX data against send data stream     - gt_rom_init_rx.dat used
         ICON/VIO/ILA for Chipscope
         _init               - GT wrapper and initialisation
            core             - GT wrapper
            RX startup FSM
            TX startup FSM
            RX/TX phase alignment

Add or delete waves to tailor the simulation to the signals of interest.

Digital Simulations Use Cases

Digital simulations of GT's are excellent for making sure you have the right connections and that the basic installation is correct. 

A successful simulation shows that the clock frequencies and connections are correct and that the use case is viable.

Digital simulations however, will not show that the equalization, termination and physical layout of the channel is workable. 

These issues could be addressed with electrical simulations.

AR# 57261
Date 09/30/2015
Status Active
Type Solution Center
Devices More Less