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CYIV-51002-1.0

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Cyclone IV Device Handbook,

Volume 1

November 2009

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2. Logic Elements and Logic Array Blocks

in Cyclone IV Devices

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 Cyclone® IV devices.

Logic Elements

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

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

■

Direct link

■

November 2009

CYIV-51002-1.0

EP4CE40 Datasheet(PDF) 29 Page - Altera Corporation

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