5M570Z datasheet(21/72 Pages) ALTERA

21 / 72 page

Chapter 2: MAX V Architecture

2–15

MultiTrack Interconnect

December 2010

Altera Corporation

MAX V Device Handbook

The column interconnect operates similarly to the row interconnect. Each column of

LABs is served by a dedicated column interconnect, which vertically routes signals to

and from LABs and row and column IOEs. These column resources include:

■

LUT chain interconnects within an LAB

■

C4 interconnects traversing a distance of four LABs in an up and down direction

MAX V devices include an enhanced interconnect structure within LABs for routing

LE output to LE input connections faster using LUT chain connections and register

chain connections. The LUT chain connection allows the combinational output of an

LE to directly drive the fast input of the LE right below it, bypassing the local

interconnect. These resources can be used as a high-speed connection for wide fan-in

functions from LE 1 to LE 10 in the same LAB. 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 2–11

shows the LUT chain and register chain interconnects.

Figure 2–10. R4 Interconnect Connections

Notes to Figure 2–10:

(1) C4 interconnects can drive R4 interconnects.

(2) This pattern is repeated for every LAB in the LAB row.

Primary

LAB (2)

R4 Interconnect

Driving Left

Adjacent LAB can

drive onto another

LAB’s R4 Interconnect

C4 Column Interconnects (1)

R4 Interconnect

Driving Right

LAB

Neighbor

LAB

Neighbor

5M570Z Datasheet(PDF) 21 Page - Altera Corporation