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looks like something massonic you know? :D .
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LOL:D , wel there is some useful books explains the fabric of the fpga you should have studied them if you are an electronics engineer, however as Rysc said you will never need to know anything about this layer while writing HDL code, HOWEVER there is something important which is the LE it self can operate in two modes : Normal mode and Arithmetic mode, the second is superior for adder,counter .... purposes while the Normal is better for combinational circuits.
search for them and you will find more about it
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