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EPF8282A Datasheet(PDF) 9 Page - Altera Corporation |
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EPF8282A Datasheet(HTML) 9 Page - Altera Corporation |
9 / 62 page Altera Corporation 9 FLEX 8000 Programmable Logic Device Family Data Sheet 3 Figure 4. FLEX 8000 Carry Chain Operation Cascade Chain With the cascade chain, the FLEX 8000 architecture can implement functions that have a very wide fan-in. Adjacent LUTs can be used to compute portions of the function in parallel; the cascade chain serially connects the intermediate values. The cascade chain can use a logical AND or logical OR (via De Morgan’s inversion) to connect the outputs of adjacent LEs. Each additional LE provides four more inputs to the effective width of a function, with a delay as low as 0.6 ns per LE. LU a1 b1 Carry s1 LE1 Register a2 b2 Carry Chain s2 LE2 Register Carry Chain s n LE n Register a n b n Carry Chain Carry-Out LE n + 1 Register Carry-In LUT LUT LUT |
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