Multi-mode look-up table with flexible routing for programmable logic device systems and methods
AssigneeLattice Semiconductor Corporation
InventorsSatwant Singh, Patrick J. Crotty
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Abstract
Various techniques are provided for implementing one or more multi-mode look-up tables (LUTs) in programmable logic devices (PLDs). In one example, a PLD includes a multi-mode LUT. The comprising: a plurality of input nodes configured to receive a plurality of input signals; wherein the multi-mode LUT is configurable to selectively operate in a first mode as a single LUT or in a second mode as dual LUTs and generate a plurality of output signals in accordance with one or more logic functions in response to the input signals; and a plurality of output nodes configured to provide the plurality of output signals simultaneously to routing resources of the PLD.
Claims20
A programmable logic device (PLD), comprising:
- a multi-mode look-up table (LUT) comprising:
- a plurality of input nodes configured to receive a plurality of input signals;
- wherein the multi-mode LUT is configurable to selectively operate in a first mode as a single LUT or in a second mode as dual LUTs and generate a plurality of output signals in accordance with one or more logic functions in response to the input signals;
- and
- a plurality of output nodes configured to provide the plurality of output signals simultaneously to routing resources of the PLD without an output multiplexer positioned between the dual LUTs and the routing resources.
A method comprising:
- receiving a plurality of input signals at a plurality of input nodes of a multi-mode look-up table (LUT) of a programmable logic device (PLD);
- selectively operating the multi-mode LUT in a first mode as a single LUT or a second mode as dual LUTs to generate output signals in accordance with one or more logic functions in response to the input signals;
- providing the output signals from corresponding output nodes of the PLD simultaneously to routing resources of the PLD without an output multiplexer positioned between the dual LUTs and the routing resources.
Dependencies are inferred from the claim text.