Look-up table structure with embedded carry logic
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United States of America Patent
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Feb 13, 2007
Grant Date -
Jun 29, 2006
app pub date -
Feb 17, 2006
filing date -
Dec 24, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multiple input look up table (LUT) structure adapted for carry-logic implementation, wherein each input is received in true and compliment levels, comprising: an output of an intermediate stage within the LUT structure; and a LUT value input of a stage next to said intermediate stage; and a multiplexer (MUX) structure coupled between the output and the LUT value input, wherein the MUX structure further comprises: a plurality of secondary inputs, including a carry-in logic signal; and a configuration circuit to couple one of the output or a said secondary input to said LUT value input.
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