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EP1C12F100I7 Datasheet(PDF) 15 Page - Altera Corporation |
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EP1C12F100I7 Datasheet(HTML) 15 Page - Altera Corporation |
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15 / 94 page ![]() Altera Corporation 15 Preliminary Information Cyclone FPGA Family Data Sheet Figure 8 shows the carry-select circuitry in an LAB for a 10-bit full adder. One portion of the LUT generates the sum of two bits using the input signals and the appropriate carry-in bit; the sum is routed to the output of the LE. The register can be bypassed for simple adders or used for accumulator functions. Another portion of the LUT generates carry-out bits. An LAB-wide carry-in bit selects which chain is used for the addition of given inputs. The carry-in signal for each chain, carry-in0 or carry-in1 , selects the carry-out to carry forward to the carry-in signal of the next-higher-order bit. The final carry-out signal is routed to an LE, where it is fed to local, row, or column interconnects. |
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