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数据搜索系统，热门电子元器件搜索 |
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EPF10K100 数据表(PDF) 16 Page - Altera Corporation |
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EPF10K100 数据表(HTML) 16 Page - Altera Corporation |
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16 / 128 page  16 Altera Corporation FLEX 10K Embedded Programmable Logic Device Family Data Sheet Figure 7 shows how an n-bit full adder can be implemented in n +1 LEs with the carry chain. One portion of the LUT generates the sum of two bits using the input signals and the carry-in signal; the sum is routed to the output of the LE. The register can either be bypassed for simple adders or be used for an accumulator function. The carry chain logic generates the carry-out signal, which is routed directly to the carry-in signal of the next- higher-order bit. The final carry-out signal is routed to an LE, where it can be used as a general-purpose signal. Figure 7. Carry Chain Operation (n-bit Full Adder) LUT a1 b1 Carry Chain s1 LE1 Register a2 b2 Carry Chain s2 LE2 Register Carry Chain sn LEn Register an bn Carry Chain Carry-Out LEn + 1 Register Carry-In LUT LUT LUT |
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