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28 The PCB Design Magazine • September 2014 feature links to specific software for FPGAs as an ex- ample. • Drill-related improvements: Specific de- scriptions for slots and cavities (depth, toler- ance, plating), Backdrill data attributes (size, tolerance, start, do not cut layer, max stub length), V-cut/V- grove (angle, offset, thickness, tolerance) for panel and pallet construction. • The SPEC (specification) section enhance- ments provide a SPEC dictionary. SPEC defines design intent and can be attached to objects in the design. This will associate currently speci- fied fabrication/assembly notes to the specific objects. The SPEC definition could describe a specific requirement for a part during the assem- bly process that would typically be described in the assembly drawing. The SPEC definition in IPC-2581 would allow that note to be attached to the component instance and reference elec- tronically, rather than shuffling through paper documents. SPEC has a very wide usage within IPC-2581 as fabrication/assembly notes are em- bedded directly into the IPC-2581 file. • Last, but not the least, a set of enhance- Figure 2: rev B allows use of attributes associated with graphical objects, such as the "+" polarity marking. Figure 3: a) library Pin one orientation, b) Pin One/Primary Pin marking, c) Polarity marking. Figure 4: a) Backdrilling of a via stub, b) v-groove parameters within IPC-2581 revision B. IPC-2581 ADOPTION UPDATE continues