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JTAG Technologies Announces Support for 'VJI'

Direct access to FPGA and cPLD cores through the Virtual JTAG Interface (VJI)

(PresseBox) (Eindhoven,The Netherlands, ) JTAG Technologies is pleased to announce its support - through its standard hardware and software systems - of the Altera VJI (Virtual JTAG Interface) Megafunction. Available for the majority of Altera's newer FPGA and cPLD families, the VJI Megafunction allows the JTAG (boundary-scan) test access port (TAP) to be used as a general purpose communications port for the transfer of data to an FPGA or cPLD.

Device families for which the VJI Megafunction is currently available include: ArriaR; StratixR; CycloneR; MAXR II; and APEXTM (II, 20KE and 20KC).

Peter van den Eijnden, Director JTAG Technologies comments: "By harnessing the capabilities of the VJI Megafunction, both designers and test development engineers can access the core of an FPGA or cPLD, via the JTAG port, during test and debug phases. This allows custom functionality to be introduced that facilitates much higher speed testing than is normally possible with standard JTAG/boundary-scan."

An application note covering the subject is available on request for existing JTAG customers.


JTAG IEEE Std. 1149.1 boundary-scan is well known by design and test engineers alike as a mechanism for proving device-to-device connectivity at a board or system-level. In the world of programmable logic it is also widely used as the de facto method for programming configuration data into devices.

VJI Uses

While regular 'standard' JTAG tests such as scan path infrastructure, [bus-wire] interconnects, memory blocks and logic cluster tests have proved invaluable for structural testing, functional testing often relies on the completion of final product firmware.

By harnessing JTAG and the VJI Megafunction JTAG (re-)programmable FPGA cores can be designed and downloaded at test-time to implement 'at-speed' functional testing of peripheral circuits. Using JTAG Technologies' systems to implement this also facilitates test execution in a production-friendly package.

Current examples include using VJI to enhance flash memory programming performance by programming a simpler reduced BSR equivalent register. Other documented uses include the use of VJI to load and trigger BIST (Built-In Self Test) cores for ADC and DAC circuits that are accessed via an FPGA.

JTAG Technologies BV

JTAG Technologies is a market leader and technology innovator of boundary-scan software and hardware products and services. The company was the first to bring to the market such important advances as automated test generation, automated fault coverage analysis, automated flash and PLD programming via boundary-scan, and visualized boundary-scan analysis. Its customers include world leaders in electronics design and manufacturing such as Ericsson, Flextronics, Honeywell, Medtronic, Motorola, Nokia, Philips, Raytheon, Rockwell-Collins, Samsung, and Sony. Its innovative boundary-scan products provide test preparation, test execution, test result analysis and in-system programming applications. With an installed base of over 5,500 systems worldwide, JTAG Technologies serves the communications, medical, electronics, avionics, defence, automotive, and consumer industries with offices throughout North America, Europe and Asia. JTAG Technologies headquarters are located in Eindhoven, The Netherlands. JTAG and JTAG Technologies are registered trademarks of JTAG Technologies, Inc. All other brand names or product names mentioned are trademarks or registered trademarks of their respective holder(s).