Download Notes - Read

Tcl/Tk Overview
Lab 2: Using Tcl Scripts and Tk Widgets
in Simulation
Introduction
This lab introduces you to the concept of using Tcl/Tk as an aid to simulation and
debugging. The lab combines a mixture of ModelSim commands, Tk widgets and
Tcl scripting. You will see that you can streamline your simulations using Tcl
scripts, and you can add push button ease to your simulations using Tk.
The files we will use for this lab are cordic_core_rtl.vhd and cor_it.do. The
cordic_core_rtl.vhd file contains the code that takes input values from vectors x
and y, performs sine and cosine calculations and adjustments on the inputs, and
outputs the angle and the difference. The cor_it.do file is a scripting file that
contains Tcl commands and serves as the design’s testbench.
Directions
Creating a Tk Button to Run a Simulation Script
1. To set up the lab, invoke ModelSim and change directory to the labs/lab2/
cordic_core directory (use the “cd” command or the File → Change
Directory… menu.
2. First we will create a work library and a logical mapping to it.
ModelSim> vlib work
ModelSim> vmap work work
3. Next we will compile the file cordic_core_rtl.vhd using the -93 switch.
ModelSim> vcom -93 cordic_core_rtl.vhd
4. Now we will load the design into the simulator memory.
ModelSim> vsim cordic_core
5. Once the design is loaded into memory, we can run the Tcl script, cor_it.do.
2-24
ModelSim Advanced Debugging
December 2002