Knowledge Base

Boundary Scan Documentation

Here is a selection of tips and information sheets we’ve put together to help with some of your boundary scan tasks. Below you will find onTAP Boundary Scan product documentation and select onTAP boundary scan/JTAG test application notes. Please choose the document you want to view from one of the links below. The links will open a PDF. If you do not have Adobe Reader, please click here. If there is a topic you do not see, please contact onTAP technical support.

Multi-UUT Manager

onTAP’s Multi-UUT Manager tool provides a method to duplicate tests when an application requires multiple test boards (UUTs) be tested at one time. This tool allows a developer to create a single set of tests and then duplicate them for as many UUTs as will be tested together.

JTAG Testing for Undetected MidState Shorts

Mid-state shorts are a major problem that often goes undetected by typical boundary scan connectivity tests is mid-state/resitive shorts. Flynn Systems recognized this “hole” in boundary scan testing and was the first boundary scan test company to test for mid-state shorts, improving test fault coverage.

Software Fault Insertion

Improves boundary scan test diagnostics by letting you verify fault coverage by injecting faults into your test. Increase confidence in your test results.

Eliminating the “Ground Bounce” Effect

Eliminating the “Ground Bounce” Effect This test setting option reduces the number of output pins switching simultaneously in any test scan.

Managing Differential I/O Pins

Addresses post-configuration I/O for FPGA and CPLD devices.

onTAP Managing Modules

Easily include multi-die modules in your test development procedure. Improves test fault coverage.


BIST Built In Self Test, also referred to as user defined test. Shows the procedure to incorporate BIST in your onTAP test strategy.

onTAP True Parallel Test

PC based, parallel JTAG testing speeds manufacturing, and eliminates the need for expensive test hardware.

The onTAP JTAG Controller Overview

onTAP Series 4000 Boundary Scan Software Information

onTAP Overview

An overview of onTAP’s capabilities and features within onTAP Series 4000.

onTAP Development

Information about the complete boundary scan solution and how onTAP helps speed test development and increase test fault coverage.

onTAP ProScan Graphical Debug Environment

This overview of the new graphical debug environment for onTAP Series 4000 provides information showing how ProScan improves your test development and manufacturing testing.

onTAP Manufacturing Product Brief

Learn about how onTAP provides an upgrade path and that fits your manufacturing test and FLASH programming needs.

onTAP DLL & Licenses

The onTAP DLL runs with third-party test executives, expanding your test capability.

Printable PDF Describing onTAP Turnkey JTAG Project Solutions

Printable PDF Describing onTAP Turnkey JTAG Project Solutions Learn how onTAP and Flynn Systems works with you as a partner to maximize test fault coverage, speed test development, time to market, and maximizes your ROI.

onTAP Technical Support

Get more information on the benefits of maintaining a current Flynn Systems Technical Support agreement.

A Brief Overview of BSDL

Learn about the Boundary Scan Description Language.

Learn more about creating DTS models

Flynn Systems works hard to maintain a current list of working and verified models of all types of memory, flash, and discreet components. All of these models are made using the DTS Language, and are not project specific. These models are flexible, easy to modify, and completely re-usable.
*We have the ability to make and add netlist translators and models for your project.

*We have the ability to make and add netlist translators and models for your project.

Application Notes

onTAP Interconnect Test

(Tutorial) Learn how to develop interconnect tests and maximize test fault coverage with onTAP. Tests include basic interconnect, AC Coupled circuits (IEEE 1149.6), loop backs, and mid-state shorts.

onTAP Memory Cluster Testing

onTAP handles memory and other non-scan devices such as popular DDR4, DDR3, DDR2, SRAM, SDRAM, I2C, Ethernet, PCI…

onTAP Flash Programming

onTAP programs flash devices, and calculates an estimated programming time. Direct Drive SPI Flash Programming capability also available.

Learn more about creating DTS models

Use the information in this document to better understand the DTS language and how to adjust onTAP DTS models.

onTAP Bus Management

Learn how to boost fault coverage by testing circuits between pins.

onTAP Managing Modules

Easily include multi-die modules in your test development procedure.

onTAP Test Types

Discover what onTAP can do, and how it’s proprietary test methods will help you get the most out of your boundary scan test strategy.

onTAP Download

And Update Requests

onTAP Video Tutorials

circuit trace Download

And Update Requests

circuit trace Video Tutorials

JTAG STIL Player Download

Knowledge Base

Basic Boundary Scan Building Blocks


Boundary Scan FAQs

A Look at BSDL

Boundary Scan
Description Language

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