Electronic digital logic circuitry – Multifunctional or programmable – Array
Reexamination Certificate
2006-10-03
2006-10-03
Tan, Vibol (Department: 2819)
Electronic digital logic circuitry
Multifunctional or programmable
Array
C326S038000, C326S113000, C326S093000
Reexamination Certificate
active
07116131
ABSTRACT:
A programmable logic device (PLD) includes dynamic lookup table (LUT) circuits, an interconnect structure implemented in either dynamic or static logic, and optional static logic circuits. Each dynamic LUT circuit has paired true and complement input terminals and provides to the interconnect structure both true and complement output signals pre-charged to a first known value. In some embodiments, the LUT circuits are self-resetting circuits that detect when the paired input signals are valid and evaluate the LUT output values at that time. Once a valid LUT output value has been produced, the LUT resets itself in anticipation of the next valid input condition. In some embodiments, the LUT circuits are implemented using clocked dynamic logic. Routing multiplexers in the interconnect structure can be static or dynamic logic, optionally skewed. Clocked LUTs and routing multiplexers use either of two clock phases under the control of configuration memory cells of the PLD.
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Chirania Manoj
Kondapalli Venu M.
Cartier Lois D.
Tan Vibol
Xilinx , Inc.
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