Logic Cells

A logic cell is the equivalent logic capacity normalized for architectural features.
 * In Virtex-6 and Spartan-6 a logic cell is 1.6 times the number of LUTs, since these use a LUT6 with 2 FFs
 * In Spartan-3 and Virtex-4 a logic cell is equal to the number of LUTs, since these use a LUT4 with a single FF.