EP4CE40 datasheet(33/488 Pages) ALTERA

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Chapter 2: Logic Elements and Logic Array Blocks in Cyclone IV Devices

2–5

Logic Array Blocks

November 2009

Altera Corporation

Cyclone IV Device Handbook,

Volume 1

Logic Array Blocks

Logic array blocks (LABs) contain groups of LEs.

Topology

Each LAB consists of the following features:

■

16 LEs

■

LAB control signals

■

LE carry chains

■

Local interconnect

The local interconnect transfers signals between LEs in the same LAB. Register chain

connections transfer the output of one LE register to the adjacent LE register in an

LAB. The Quartus II Compiler places associated logic in an LAB or adjacent LABs,

allowing the use of local and register chain connections for performance and area

efficiency.

Figure 2–4 shows the LAB structure for Cyclone IV devices.

Figure 2–4. Cyclone IV Device LAB Structure

Direct link

interconnect

from adjacent

block

Direct link

interconnect

to adjacent

block

Row Interconnect

Column

Interconnect

Local Interconnect

LAB

Direct link

interconnect

from adjacent

block

Direct link

interconnect

to adjacent

block

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