Writing correct and usable specifications for board and test: acase study

摘要

The author notes that current board test system specifications arenot adequate for a complete analysis of tester capability. He examinesthe error sources in timing specification; defines overall edgeplacement accuracy; discusses automatic compensation techniques for adistributed architecture tester; shows the effect of load, slew rate,and level variations on specifications; and gives techniques to verifymanufacturer's claims. He demonstrates that, in order to be meaningful,a driver or receiver must be referenced to other drivers and receivers,to an internal tester clock, and, ideally, to a user-supplied referenceclock. It is concluded that, although the overall edge placementaccuracy specification is extremely useful, the user needs to recognizehow limitations, such as variations in loads, programmed levels, andprogrammed slew rates, will affect the edge placement accuracy of thetester