Programmable logic array ppt

A programmable logic array pla is a kind of programmable logic device used to implement combinational logic circuits. Even though pals are less flexible than plas, they eliminate the time delays associated with programmable or gates. Programmable logic array pla e programmable array logic pal a a compact form of the internal logic of plds can be referred to as array logic. The pla programmable logic array has programmable connections for both. Unlike, pla product term cannot be shared among two or more or gates. When designing with a pal, the boolean functions must be simplified. 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. Programmable array logic pal 1 programmable array logic pal fixed or array programmable and array. Plds have undefined function at the time of manufacturing but they are programmed before made into use. Ppt programmable array logic pal powerpoint presentation. Fixed or array programmable and array easy to program poor flexibility boolean function must be simplified to fit into each. The device shown in the figure has 4 inputs and 4 outputs. Programmable logic arraypla, digital circuits slideshare.

The advantage of pal is that we can generate only the required product terms of boolean function instead of generating all the min terms by using programmable and gates. As only and gates are programmable, the pal device is easier to program but it is not as flexible as the pla. It has 2 n and gates for n input variables, and for m outputs from pla, there should be m or gates. A programmable logic array pla has a programmable and array at the inputs and programmable or array at the outputs. Fpga field programmable gate array introduction, structure. The pal device is a pld with a fixed or array and a programmable and array. Programmable logic array pla c university of waterloo. Ppt programmable logic array mohammed najm abdullah al. Unlike the pla, a product term cannot be shared among two or more or gates. Programmable logic array it is kind of pld used to implement combinational logic circuit. The device has a number of and and or gates which are linked together to give output or further combined with more gates or logic circuits. Programmable array logic pal a a compact form of the internal logic of plds can be referred to as array logic when designing with a pal, the boolean functions must be simplified unlike the pla, a product term cannot be shared among two or more or gates.