초록 ▼

A configurable logic element (CLE) for a field programmable gate array (FPGA) includes "expanders", i.e., connectors that allow fast signal communication between logic blocks. Expanders allow the configurable interconnection of a plurality of logic blocks, or portions thereof, to form a single logic

A configurable logic element (CLE) for a field programmable gate array (FPGA) includes "expanders", i.e., connectors that allow fast signal communication between logic blocks. Expanders allow the configurable interconnection of a plurality of logic blocks, or portions thereof, to form a single logical entity that can implement large user circuits such as PALs, lookup tables, multiplexers, tristate buffers, and memories. One embodiment includes a configurable logic block. In a first mode, the logic block provides two N-input LUTs having N shared inputs and two separate outputs. The outputs are then combined using an expander to generate an (N+1)-input function. In a second mode, the logic block provides two N-input LUTs having M unshared inputs. An optional third mode provides a plurality of product term output signals based on the values of the N input signals.

대표청구항 ▼

1. A configurable logic element (CLE) for a programmable logic device (PLD), the CLE comprising:a logic block providing two N-input lookup tables (LUTS), the logic block having a first LUT mode wherein the two LUTs have at least one unshared input and a second LUT mode wherein the two LUTs have N sh

1. A configurable logic element (CLE) for a programmable logic device (PLD), the CLE comprising:a logic block providing two N-input lookup tables (LUTS), the logic block having a first LUT mode wherein the two LUTs have at least one unshared input and a second LUT mode wherein the two LUTs have N shared inputs; and an AB expander configurably interconnecting the outputs of the two LUTs, the AB expander having two or more configurable functions one of which is a multiplexer function from which the AB expander provides the output of an (N+1)-input LUT.