Companies need to determine early in the design phase how to maximize test coverage
using the minimum number of test points, so it is essential to know what JTAG access is available at the schematic stage of the design process.
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This typically will result in test coverage
occasionally approaching 100%.
Boundary scan enables test coverage
at the in-circuit test stations in limited test access situations.
TestWay's test coverage
analysis module to allow users to estimate and measure the overall test coverage
provided by either a single piece of test equipment or a combination of test systems, from the test equipment list.
The TestWay Coverage Analyst provides a push-button test coverage
analysis tool for coverage estimation (pre-test program development) and coverage measurement (post-test program measurement) using PCOLA-SOQ1for the Agilent Medalist i3070 and i1000 platforms and other test and inspection equipment on the user's production line, such as optical and X-ray inspection, boundary scan tester, MDA and functional test.
With more test methods evolving from boundary scan, one can now expect boundary scan to provide test coverage
beyond just boundary scan devices.
Usually, an optimum test strategy boils down to achieving maximum test coverage
at an acceptable cost level (Figure 1).
While some of those solutions offer improved test coverage
by combining boundary scan and ATE resources, they introduce new problems like skewed test-coverage statistics and very limited portability.
SpyGlass-DFT provided test coverage
at the RTL-level and helped address scan and testability issues early in the design cycle.
It also determines the extent of a design's boundary scan test coverage
and recommends changes to increase coverage.
The XJTAG system has been implemented at Prism's 6,500 square foot manufacturing facility in St Ives, England, where it has led to significantly improved production test coverage
- up to 98% for certain boards - and it is also being used extensively for new product introductions and prototype verification.