Programmable logic array - Wikipedia, the free encyclopedia. A programmable logic array (PLA) is a kind of programmable logic device used to implement combinational logiccircuits. 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. It has 2^N AND Gates for N input variables and for M outputs from PLA, there should be M OR Gates, each with programmable inputs from all of the AND gates. This layout allows for a large number of logic functions to be synthesized in the sum of products (and sometimes product of sums) canonical forms. PLA's differ from Programmable Array Logic devices (PALs and GALs) in that both the AND and OR gate planes are programmable.
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Philips Semiconductors Programmable Logic Devices Product specification PLS173 Programmable logic array (22
JK flip flop for memory. TI coined the term Programmable Logic Array for this device. However, that would require a separate memory location for every possible combination of inputs, including combinations that are never supposed to occur, and also duplicating data for . This is particularly valuable when it is part of a processing chip where transistors are scarce (for example, the original 6.
PLA to direct various operations of the processor. It defines various states in an instruction set, and produces the next state (by conditional branching). Programmable logic arrays should correspond to a state diagram for the system. Other commonly used programmable logic devices are PAL, CPLD and FPGA. Note that the use of the word . This is particularly true of PLAs that are embedded in more complex and numerous integrated circuits such as microprocessors. PLAs that can be programmed after manufacture are called FPGA (Field- programmable gate array), or less frequently FPLA (Field- programmable logic array).
IEEE TRANSACTIONS ON COMPUTERS, VOL. 9, SEPTEMBER 1979 AHigh Density Programmable Logic Array Chip ROY A. WOOD Abstract-Aprogrammablelogic array (PLA)chipdesign using specialarrayfoldingtechniquesandanon-chipbusstructurehasbeen. 1 Memory and Programmable Logic Memory Device: Device to which binary information is transferred for storage, and from which information is available for processing as needed. Memory Unit: is a collection of cells capable of storing a large quantity of binary. Circuit Description This applet shows the structure of a PLA or programmable logic array. Logically, a PLA is a circuit that allows implementing Boolean functions in sum-of-product form. The typical implementation consists of input buffers for all inputs, the. Programmable array logic pdf Programmable Array Logic PAL is a family of programmable logic device. The Universal Language For Programmable Logic PDF Press release.array. Programmable array block diagram for sum of products form.array product terms.
The Commodore 6. 4 home computer released in 1.