188.8.131.52. Modes of Operation
When an LE is configured in normal mode, the LUT in the LE can implement a function of four inputs.
When the LE is configured in arithmetic mode, the LUT in the LE is divided into two 3-input LUTs. The first LUT generates the signal that drives the output of the LUT, while the second LUT generates the carry-out signal. The carry-out signal can drive only a carry-in signal of another LE.
For more information about LE modes of operation, refer to volume 1 of the appropriate device handbook.
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