Testing and inspection

What is the main use of boundary scan, specified in IEEE 1149.1 (JTAG)?

  1. AMeasuring film thickness on wafers
  2. BEvaluating electromigration in wiring
  3. CTesting connections between the pins of LSIs mounted on a printed circuit board, without applying probes
Show answer and explanation

Answer: C. Testing connections between the pins of LSIs mounted on a printed circuit board, without applying probes

In boundary scan, scan cells are placed just inside each LSI pin and chained serially so values can be set and observed from outside. Even for BGAs and other parts whose pins cannot be probed on the board, defects such as bad solder joints can be detected. It is also used for debugging and programming.

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More Testing and inspection questions

  1. In final test after packaging, which machine works with the tester to feed ICs automatically and sort them according to test results?
  2. What is the two-dimensional chart called that summarizes pass/fail results while varying conditions such as supply voltage and operating frequency?
  3. Which correctly describes the typical test flow of semiconductor products?
  4. Which items are mainly checked in an AC test?
  5. What is the technology called that expands test patterns inside the chip and compresses the responses to reduce scan test data volume and test time?