EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 31

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

Introduction
Overview
Logic Elements
Altera Corporation-Preliminary
March 2007
CIII51002-1.0
This chapter contains feature definitions for logic elements (LEs) and
logic array blocks (LABs). It provides details on how an LE works, how
LABs contain groups of LEs, and how LABs interface with the other
blocks in Cyclone
The logic array consists of LABs, with 16 LEs in each LAB. An LE is a
small unit of logic providing efficient implementation of user logic
functions. LABs are grouped into rows and columns across the device.
Cyclone III devices range from 5,136 to 119,088 LEs.
The smallest unit of logic in the Cyclone III architecture, the LE, is
compact and provides advanced features with efficient logic utilization.
Each LE features:
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■
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Figure 2–1
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 all types of interconnects: local, row, column,
register chain, and direct link interconnects
Support for register packing
Support for register feedback
shows a Cyclone III LE.
2. Logic Elements and Logic
®
III devices.
Array Blocks in Cyclone III
Devices
Preliminary
2–1