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PLA schematic example. A programmable logic array (PLA) is a kind of programmable logic device used to implement combinational logic circuits.The PLA has a set of programmable AND gate planes, which link to a set of programmable OR gate planes, which can then be conditionally complemented to produce an output.
PLA can degrade into innocuous lactic acid, making it suitable for use as medical implants in the form of anchors, screws, plates, pins, rods, and mesh. [45] Depending on the type used, it breaks down inside the body within 6 months to 2 years.
A desktop FFF printer made by Stratasys. Fused deposition modeling was developed by S. Scott Crump, co-founder of Stratasys, in 1988. [6] [7] With the 2009 expiration of the patent on this technology, [8] people could use this type of printing without paying Stratasys for the right to do so, opening up commercial, DIY, and open-source 3D printer applications.
PFD – process flow diagram; PFD – probability of failure on demand; PFE – plate/frame heat exchanger; PFHE – plate fin/frame heat exchanger; PFPG – perforation plug log; PFREC – perforation record log; PG – pressure gauge (report) PGC – Potential Gas Committee; PGB – permanent guide base; PGOR – produced gas oil ratio
A programmable logic device (PLD) is an electronic component used to build reconfigurable digital circuits. Unlike digital logic constructed using discrete logic gates with fixed functions, the function of a PLD is undefined at the time of manufacture. Before the PLD can be used in a circuit it must be programmed to implement the desired ...
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CPLDs were an evolutionary step from even smaller devices that preceded them: PLAs (first shipped by Signetics) and PALs.These in turn were preceded by standard logic products, which offered no programmability and were used to build logic functions by physically wiring several standard logic chips (or hundreds of them) together (usually with wiring on a printed circuit board or boards, but ...
Circuit diagrams were formerly used to write the configuration. The logic blocks of an FPGA can be configured to perform complex combinational functions, or act as simple logic gates like AND and XOR. In most FPGAs, logic blocks also include memory elements, which may be simple flip-flops or more sophisticated blocks of memory. [2]