EPM240 datasheet(21/88 Pages) ALTERA

21 / 88 page

Chapter 2: MAX II Architecture

2–13

MultiTrack Interconnect

Altera Corporation

MAX II Device Handbook

The R4 interconnects span four LABs and are used for fast row connections in a four-

LAB region. Every LAB has its own set of R4 interconnects to drive either left or right.

Figure 2–10 shows R4 interconnect connections from an LAB. R4 interconnects can

drive and be driven by row IOEs. For LAB interfacing, a primary LAB or horizontal

LAB neighbor can drive a given R4 interconnect. For R4 interconnects that drive to the

right, the primary LAB and right neighbor can drive on to the interconnect. For R4

interconnects that drive to the left, the primary LAB and its left neighbor can drive on

to the interconnect. R4 interconnects can drive other R4 interconnects to extend the

range of LABs they can drive. R4 interconnects can also drive C4 interconnects for

connections from one row to another.

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 II 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

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

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