什么是LE?

请问什么是LE?

LE应该是ALTERA对其器件的最小单元的一种叫法，下面是从Cyclone III手册中摘录的。
An LE is the smallest unit of logic in the Cyclone III device family architecture.
Each LE has four inputs, a four-input look-up table (LUT), a register, and output logic.
The four-input LUT is a function generator that can implement any function with four
variables.

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