Logic element for a programmable logic integrated circuit
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United States of America Patent
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Mar 19, 2002
Grant Date -
N/A
app pub date -
Jul 26, 2001
filing date -
Apr 9, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A logic element (300) for a programmable logic integrated circuit allows two independent logic functions to be carried out during the same clock cycle. In an embodiment, a 4-input lookup table (406) is provided using a 3-input lookup table (434) and two 2-input lookup tables. The results of the 4-input lookup table (406) and the 3-input lookup table (434) may be routed simultaneously from the logic element. It also allows a signal to be routed through a logic element (300) while carrying out an independent logic function. Carry logic (425) is provided. The results of the carry logic (486) may be routed to the global and local interconnect structure of the programmable logic integrated circuit.
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