Virtual JTAG Intel® FPGA IP Core User Guide

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ID 683705
Date 8/12/2021
Public
Document Table of Contents
Document Table of Contents x
Virtual JTAG Intel® FPGA IP Core User Guide
Virtual JTAG Intel® FPGA IP Core User Guide x
Introduction System-Level Debugging Infrastructure Virtual JTAG Interface Description Run-Time Communication Instantiating the Virtual JTAG Intel® FPGA IP Core Simulation Support Compiling the Design SLD_NODE Discovery and Enumeration Capturing the Virtual IR Instruction Register AHDL Function Prototype VHDL Component Declaration VHDL LIBRARY-USE Declaration Design Example: TAP Controller State Machine Design Example: Modifying the DCFIFO Contents at Runtime Design Example: Offloading Hardwired Revision Information Document Revision History for the Virtual JTAG Intel® FPGA IP Core User Guide
Introduction x
Installing and Licensing Intel® FPGA IP Cores On-Chip Debugging Tool Suite Applications of the Virtual JTAG Intel® FPGA IP Core JTAG Protocol JTAG Circuitry Architecture
System-Level Debugging Infrastructure x
Transaction Model of the SLD Infrastructure SLD Hub Finite State Machine
Virtual JTAG Interface Description x
Input Ports Output Ports Parameters Design Flow of the Virtual JTAG Intel® FPGA IP Core Simulation Model Run-Time Communication Running a DR Shift Operation Through a Virtual JTAG Chain
Run-Time Communication x
Virtual IR/DR Shift Transaction without Returning Captured IR/DR Values Virtual IR/DR Shift Transaction that Captures Current VIR/VDR Values Reset Considerations when Using a Custom JTAG Controller
Instantiating the Virtual JTAG Intel® FPGA IP Core x
IP Catalog and Parameter Editor Specifying IP Core Parameters and Options Instantiating Directly in HDL
IP Catalog and Parameter Editor x
The Parameter Editor
Specifying IP Core Parameters and Options x
Files Generated for Intel® FPGA IP Cores (Legacy Parameter Editor)
Compiling the Design x
Third-Party Synthesis Support
SLD_NODE Discovery and Enumeration x
Issuing the HUB_INFO Instruction HUB IP Configuration Register SLD_NODE Info Register
Design Example: Modifying the DCFIFO Contents at Runtime x
Write Logic Read Logic Runtime Communication
Design Example: Offloading Hardwired Revision Information x
Configuring the JTAG User Code Setting
Virtual JTAG Intel® FPGA IP Core User Guide

Introduction

The Virtual JTAG Intel® FPGA IP core allows you to create your own software solution for monitoring, updating, and debugging designs through the JTAG port without using I/O pins on the device, and is one feature in the On‑Chip Debugging Tool Suite. The Intel® Quartus® Prime software or JTAG control host identifies each instance of this IP core by a unique index. Each IP core instance functions in a flow that resembles the JTAG operation of a device. The logic that uses this interface must maintain the continuity of the JTAG chain on behalf the PLD device when this instance becomes active.

With the Virtual JTAG Intel® FPGA IP core you can build your design for efficient, fast, and productive debugging solutions. Debugging solutions can be part of an evaluation test where you use other logic analyzers to debug your design, or as part of a production test where you do not have a host running an embedded logic analyzer. In addition to debugging features, you can use the Virtual JTAG Intel® FPGA IP core to provide a single channel or multiple serial channels through the JTAG port of the device. You can use serial channels in applications to capture data or to force data to various parts of your logic.

Each feature in the On‑Chip Debugging Tool Suite leverages on-chip resources to achieve real time visibility to the logic under test. During runtime, each tool shares the JTAG connection to transmit collected test data to the Intel® Quartus® Prime software for analysis. The tool set consists of a set of GUIs, IP core intellectual property (IP) cores, and Tcl application programming interfaces (APIs). The GUIs provide the configuration of test signals and the visualization of data captured during debugging. The Tcl scripting interface provides automation during runtime.

The Virtual JTAG Intel® FPGA IP core provides you direct access to the JTAG control signals routed to the FPGA core logic, which gives you a fine granularity of control over the JTAG resource and opens up the JTAG resource as a general‑purpose serial communication interface. A complete Tcl API is available for sending and receiving transactions into your device during runtime. Because the JTAG pins are readily accessible during runtime, this IP core enables an easy way to customize a JTAG scan chain internal to the device, which you can then use to create debugging applications.

Examples of debugging applications include induced trigger conditions evaluated by a Signal Tap logic analyzer by exercising test signals connected to the analyzer instance, a replacement for a front panel interface during the prototyping phase of the design, or inserted test vectors for exercising the design under test.

The infrastructure is an extension of the JTAG protocol for use with Intel® ‑specific applications and user applications, such as the Signal Tap logic analyzer.

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