Configuring the jtag user code setting – Altera Virtual JTAG IP Core User Manual
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Design Example: Offloading Hardwired Revision Information
This example demonstrates how you can use a GUI to offload revision information that is hardwired into
a design. The GUI offloads the time that the design was compiled, the USERCODE from the device, and
compile number that tracks the number of compile iterations that have been performed.
Because the Quartus II software ships with an installation of Tcl/Tk, you can use the Tk package to build a
custom GUI to interact with your design. In many cases, the JTAG port is a convenient interface to use,
since it is present in most designs for debug purposes. By leveraging Tk and the virtual JTAG interface, you
perform rapid prototyping such as creating virtual front panels or creating simple software applications.
The figure below shows the organization of the design.
Figure 22: Design Organization Example
Top-Level Design
JTAG
Version
Control
Information
VJI
USERCODE
A Tcl script creates and updates the verilog file containing the hardcoded version control information every
time the project goes through a full compile. The Tcl script is executed automatically by adding the following
assignment to the project’s .qsf file.
The
USERCODE
value shifted out by this design example is a user-configurable 32-bit JTAG register. This
value is configured in the Quartus II software using the Device and Pin Options dialog box.
Configuring the JTAG User Code Setting
The following steps describe how to configure the JTAG User Code setting. A separate script generates the
GUI and is executed with the
quartus_stp
command line executable. During runtime, the GUI queries the
device for the version information and formats it for display within the message box.
1. On the Assignment menu, click Settings.
2. On the Settings page, in the Category list, click Device.
3. The Device dialog box appears. Click Device and Pin Options.
4. In the Device and Pin Options dialog box, on the General tab, the JTAG user code appears. Type the
user code in 32-bit hexadecimal format.
5. Click OK.
Related Information
•
Using the MegaWizard Plug-In Manager
on page 22
•
Altera Corporation
Virtual JTAG Megafunction (sld_virtual_jtag)
41
Design Example: Offloading Hardwired Revision Information
UG-SLDVRTL
2014.03.19