EP2C8 datasheet(24/168 Pages) ALTERA

24 / 168 page

2–12

Altera Corporation

Cyclone II Device Handbook, Volume 1

February 2007

MultiTrack Interconnect

R24 row interconnects span 24 LABs and provide the fastest resource for

long row connections between non-adjacent LABs, M4K memory blocks,

dedicated multipliers, and row IOEs. R24 row interconnects drive to

other row or column interconnects at every fourth LAB. R24 row

interconnects drive LAB local interconnects via R4 and C4 interconnects

and do not drive directly to LAB local interconnects. R24 interconnects

can drive R24, R4, C16, and C4 interconnects.

Column Interconnects

The column interconnect operates similar to the row interconnect. Each

column of LABs is served by a dedicated column interconnect, which

vertically routes signals to and from LABs, M4K memory blocks,

embedded multipliers, and row and column IOEs. These column

resources include:

■

C4 interconnects traversing a distance of four blocks in an up and

down direction

■

C16 interconnects for high-speed vertical routing through the device

Cyclone II devices include an enhanced interconnect structure within

LABs for routing LE output to LE input connections faster using register

chain connections. The register chain connection allows the register

output of one LE to connect directly to the register input of the next LE in

the LAB for fast shift registers. The Quartus II Compiler automatically

takes advantage of these resources to improve utilization and

performance. Figure 2–9 shows the register chain interconnects.

EP2C8 Datasheet(PDF) 24 Page - Altera Corporation