EP2C5F256C7N Datasheet, PDF (19/168 Pages) Altera Corporation – Section I. Cyclone II Device Family Data Sheet

Cyclone II Architecture
Logic Array
Blocks
Each LAB consists of the following:
■ 16 LEs
■ LAB control signals
■ LE carry chains
■ Register chains
■ Local interconnect
The local interconnect transfers signals between LEs in the same LAB.
Register chain connections transfer the output of one LE’s register to the
adjacent LE’s register within an LAB. The Quartus II Compiler places
associated logic within an LAB or adjacent LABs, allowing the use of
local, and register chain connections for performance and area efficiency.
Figure 2–5 shows the Cyclone II LAB.
Figure 2–5. Cyclone II LAB Structure
Row Interconnect
Direct link
interconnect
from adjacent
block
Direct link
interconnect
to adjacent
block
LAB
Local Interconnect
Column
Interconnect
Direct link
interconnect
from adjacent
block
Direct link
interconnect
to adjacent
block
Altera Corporation
February 2007
2–7
Cyclone II Device Handbook, Volume 1