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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.
The project to create the PAL device was managed by John Birkner and the actual PAL circuit was designed by H. T. Chua. [3] In a previous job (at mini-computer manufacturer Computer Automation), Birkner had developed a 16-bit processor using 80 standard logic devices. His experience with standard logic led him to believe that user-programmable ...
A programmable logic array (PLA) has a programmable AND gate array, which links to a programmable OR gate array, which can then be conditionally complemented to produce an output. A PLA is similar to a ROM concept, however a PLA does not provide full decoding of a variable and does not generate all the minterms as in a ROM.
The term commonly refers to devices such as ROMs, PALs, PLAs and GALs. ... (PLA) Field-programmable logic arrays (FPLA) ... Introduction to Digital Systems: Modeling, ...
Technology node 1 μm. A complex programmable logic device ( CPLD ) is a programmable logic device with complexity between that of PALs and FPGAs , and architectural features of both. The main building block of the CPLD is a macrocell , which contains logic implementing disjunctive normal form expressions and more specialized logic operations.
It is one type of read-only memory (ROM). PROMs are used in digital electronic devices to store permanent data, usually low level programs such as firmware or microcode. The key difference from a standard ROM is that the data is written into a ROM during manufacture, while with a PROM the data is programmed into them after manufacture. Thus ...
The MOS Technology 6502 is an example of a microprocessor using a PLA for instruction decode and sequencing. The PLA is visible in photomicrographs of the chip, [12] and its operation can be seen in the transistor-level simulation. Microprogramming is still used in modern CPU designs.
The Generic Array Logic (also known as GAL and sometimes as gate array logic [1]) device was an innovation of the PAL and was invented by Lattice Semiconductor. The GAL was an improvement on the PAL because one device type was able to take the place of many PAL device types or could even have functionality not covered by the original range of ...