News - Board and System Test

First development tool for the emerging IJTAG Standard

10 November 2010 - The ASSET ScanWorks platform for embedded instruments has the industry's first toolkit to automate the development of validation and test routines based on the soon-to-be ratified Internal JTAG (IEEE P1687 IJTAG) standard. The beta version of the ScanWorks IJTAG toolkit for developers has already been deployed by two equipment manufacturers and Flextronics, one of the leading electronic manufacturing services (EMS) firms in the world.

According to Al Crouch, co-chairman of the IEEE IJTAG working group and a chief technologist at ASSET, ratification of the IJTAG standard is expected during the second half of 2011.

The IJTAG standard specifies an access architecture and protocol for instruments that are embedded into semiconductor chips. In addition, it defines how these embedded instruments can be managed, accessed and automated, and their output analyzed. ScanWorks IJTAG provides tools that can read IJTAG's two languages, Instrument Connectivity Language (ICL) and Procedural Description Language (PDL), and exercise embedded IJTAG instruments. ICL defines the connections among embedded instruments in chips and on circuit boards while PDL is an extension of the popular Tcl (Tool command language) for programming validation, test and debug vectors to be executed by IJTAG instruments.

"Our early users have provided us with valuable insight into the functionality that chip and circuit board designers need to take full advantage of IJTAG's many integration and product life-cycle benefits. Certainly the rapid adoption of any standard depends upon the support it receives from firms across the industry," said Scott Hack, ASSET's product manager for ScanWorks IJTAG tools. "We're seeing this take place now and we expect our toolkit to accelerate the adoption process even further."

The IJTAG standard will enable a new generation of embedded validation, test and debug methods for chips, circuit boards and systems. For the first time, validation and test routines will be portable. The routines or vectors based on IJTAG will hold tremendous value for manufacturers because they will migrate along with the instruments in the chips and be re-used during every stage in the integration and product life cycle. Starting with core intellectual property (IP) and chip development, a device's IJTAG capabilities will move with it into circuit board assembly and eventually into system integration, field deployment and repair. Before the IJTAG standard, separate and unrelated validation routines and test vectors were developed at each stage in a system's life cycle, compounding unnecessarily the cost of finished products. Now manufacturers can pass along reduced costs to users and achieve higher quality and greater reliability in their products because of the more thorough validation and test methods made possible by IJTAG.

"Embedded instruments have been placed in chips for some time now; we're just now getting around to capitalizing on them by standardizing how we access and re-use them," Hack explained. "For example, certain built-in self test (BIST) capabilities have been in chips for years, but they were never readily accessible or easy to use for system-on-a-chip (SoC), circuit board and system developers. Now they are because of tools like ScanWorks IJTAG."

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