JTAG Boundary-Scan Benefits FAQ

Learn some facts on how you can benefit from JTAG and JET technology.

There is an increased demand for JTAG due to some of the following:

  • PC boards are becoming more complex
    • Loss of physical/electrical access decreases
      effectiveness of Bed of Nails test technologie
    • Smaller, multilayer, internal vias, dual-sided placement, BGAs, more complex devices
  • Product life cycles are becoming shorter
    • Minimize time from design to volume manufacturing
  • Device packaging density and lack of access makes physical access
    • Expensive
    • Unreliable
    • Impossible
  • Increased Board Density
  • In-System Programming
  • JTAG provides the capability to test interconnects on a PC-board without physical test probes or test fixtures
  • Does not require the board to be in a bootable state for fault diagnostics
  • JTAG allows In-System Programming of devices such as Flash, CPLDs, FPGAs and Serial EEPROMs
  • Automated test development for DSP initialization, memory and flash
  • Device level diagnostics
  • Customized diagnostic messages
  • JET rigorously exercises all external memory locations before execution of any boot code
  • Test vectors can be reused in production
  • Does not require the board to be in a bootable state for fault diagnostics
  • Embedded tests are downloaded and run from on-chip DSP memory at-speed
  • Provides testability on all DSP addressable components by exercising their functionality
  • In-system programming at theoretical speeds reduces time waiting for code to download
  • Automated test development for DSP initialization, memory and flash
  • Device level diagnostics
  • Customized diagnostic messages
  • JET rigorously exercises all external memory locations before execution of any boot code
  • Test vectors can be reused in production
  • JTAG Pin Connectivity; Noisy Signals
  • Opens, Shorts & Stuck-At Conditions
  • DSP Initialization
  • Component Discovery and Identification
  • Bad Memory Locations
  • Flash Communication Problems
  • Timing Problems