The combination LUT/dual flip-flop can be used as logic, distributed RAM, or shift-registers, as stated in the 'Spartan-6 Family Overview', linked above. It's easy to construct such a function - a function that requires two different 2-input LUTs. The LUTs are set to mimic logic gate combinations, and the flip-flops are used as a form of storage and as counters and dividers. the FPGA reliability improvement problem as follows: Problem: Given a circuit, use technology mapping to improve reliability by reducing the number of critical bits in the LUT configuration bits used to implement the circuit. These additional functions require a true 3-input LUT, or two 2-input LUTs plus a mux. However, this leaves 256 - 96 = 160 functions that cannot be created. One common defect point is in the lookup table (LUT) configuration bits, which are crucial to the correct operation of FPGAs. The FPGA configuration is generally specified using a hardware description language (HDL), similar to that used for an application-specific integrated circuit (ASIC). XC4000 series it can also be used as a RAM. Since you get to pick which of the three input variables is connected to the second LUT, you can actually create up to 32 × 3 = 96 different functions this way. A field-programmable gate array (FPGA) is an integrated circuit designed to be configured after manufacturing. The LUT is mostly used for implementing combinational logic, although in the Xilinx. When you cascade two 2-input LUTs, you are effectively creating a temporary variable T that is a function of two of the inputs (16 choices) and then the final output is a function of T and the third input (16 more choices), for a total of 32 choices. Each value represents one possible Boolean function of the three input variables.Ī 2-input LUT can contain one of 2 4 = 16 different functions. The LUT is the basic building block of an FPGA and is capable of implementing any logic function of N Boolean variables. Some of the most commonly used FPGA resources are number of LUTs and number of slices 17 18 FPGA have the ability to hold the entire system on a single chip and also allow in-platform. A 3-input LUT is an 8-bit memory, and that memory can contain one of 2 8 = 256 different values.
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