Figure 9-33 shows a simplified version of a CLB.This CLB contains two functiongenerators, two flip-flops, and various multiplexers for routing signals within the CLB.Each function generator has four inputs and can implement any function of up to fourvariables.The function generators are implemented as lookup tables (LUTs). A fourinputLUT is essentially a reprogrammable ROM with 16 1-bit words. This ROMstores the truth table for the function being generated. The H multiplexer selectseither F or G depending on the value of H1.The CLB has two combinational outputs
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