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US 6,747,480 B1Granted
Programmable logic devices with bidirect ional cascades
AssigneeAltera Corporation
InventorsSinan Kaptanoglu, Michael D. Hutton, James Schleicher
Life of this patent
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AssigneeAltera Corporation
InventorsSinan Kaptanoglu, Michael D. Hutton, James Schleicher
Estimating the term…
A programmable logic integrated circuit device has a plurality of regions of programmable logic disposed on the device in a plurality of intersecting rows and columns of such regions. The regions of logic may include logic subregions that each have a look-up table. Interconnection resources (e.g., inter-region and intra-region interconnection conductors, signal buffers and drivers, programmable connectors, etc.) are provided on the device for making programmable interconnections between the look-up tables. Programmable bidirectional cascade circuitry that is distinct from the interconnections may be used to make connections directly from the output of one look-up table to another without using the interconnection resources. The programmable cascade circuitry may be programmed so that multiple look-up tables are interconnected to form sequential cascade chains or cascade trees.
Programmable logic device circuitry comprising:
Circuitry comprising:
A method for programming programmable logic device circuitry to implement a given logic function in look-up table logic, wherein the programmable logic device circuitry has a plurality of look-up tables each having a plurality of look-up table inputs and a corresponding look-up table output and programmable cascade circuitry, comprising:
Dependencies are inferred from the claim text.