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EP3C80

Cyclone III Device Handbook

Altera Corporation 

December 2011

CIII51002-2.3

CIII51002-2.3

2. Logic Elements and Logic Array Blocks

in the Cyclone III Device Family

This chapter contains feature definitions for logic elements (LEs) and logic array

blocks (LABs). Details are provided on how LEs work, how LABs contain groups of

LEs, and how LABs interface with the other blocks in the Cyclone® III device family

(Cyclone III and Cyclone III LS devices).

Logic Elements

Logic elements (LEs) are the smallest units of logic in the Cyclone III device family

architecture. LEs are compact and provide advanced features with efficient logic

usage. Each LE has the following features:

■ A four-input look-up table (LUT), which can implement any function of four

variables

■ A programmable register

■ A carry chain connection

■ A register chain connection

■ The ability to drive the following interconnects:

■ Local

■ Row

■ Column

■ Register chain

■ Direct link

■ Register packing support

■ Register feedback support

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trademarks or service marks are the property of their respective holders as described at www.altera.com/common/legal.html. Altera warrants performance of its

semiconductor products to current specifications in accordance with Altera's standard warranty, but reserves the right to make changes to any products and

services at any time without notice. Altera assumes no responsibility or liability arising out of the application or use of any information, product, or service

described herein except as expressly agreed to in writing by Altera. Altera customers are advised to obtain the latest version of device specifications before relying

on any published information and before placing orders for products or services.

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Cyclone III Device Handbook

Volume 1

December 2011

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