Experiment 26: Analyzing JTAG Communication

Objective: Debug and analyze JTAG communication for device testing and programming.

Background:

JTAG (Joint Test Action Group) is a standard for testing and programming electronic devices. It provides a method for accessing the internals of a device, including its microcontroller or FPGA, using a set of standard pins. In this experiment, we will use a JTAG analyzer to capture and decode communication signals to verify the functionality of the device under test.

Steps:

1. Setup:
   • Connect the JTAG analyzer to the device under test via the JTAG interface pins (TDI, TDO, TMS, TCK, and possibly TRST).
   • Ensure the device is powered on and the JTAG interface is correctly configured for communication.
2. Capture JTAG Signals:
   • Initiate communication with the device using the JTAG analyzer software.
   • Monitor the JTAG signals during device testing or programming activities.
3. Analyze Data:
   • Interpret the captured JTAG signals to verify correct communication between the analyzer and the device.
   • Check for any errors or issues in the device’s response during the JTAG sequence.

Expected Outcome:

Understand how JTAG communication works and how to use it for debugging and testing purposes. You will learn how to capture and interpret JTAG signals to verify that devices are correctly responding to programming and test commands.