EP2S15 datasheet(31/238 Pages) ALTERA

31 / 238 page

Altera Corporation

2–23

May 2007

Stratix II Device Handbook, Volume 1

Stratix II Architecture

The direct link interconnect allows an LAB, DSP block, or TriMatrix

memory block to drive into the local interconnect of its left and right

neighbors and then back into itself. This provides fast communication

between adjacent LABs and/or blocks without using row interconnect

resources.

The R4 interconnects span four LABs, three LABs and one M512 RAM

block, two LABs and one M4K RAM block, or two LABs and one DSP

block to the right or left of a source LAB. These resources 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 2–16 shows R4

interconnect connections from an LAB. R4 interconnects can drive and be

driven by DSP blocks and RAM blocks and row IOEs. For LAB

interfacing, a primary LAB or 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 and C16 interconnects for connections

from one row to another. Additionally, R4 interconnects can drive R24

interconnects.

Figure 2–16. R4 Interconnect Connections

Notes (1), (2), (3)

Notes to Figure 2–16:

(1)

C4 and C16 interconnects can drive R4 interconnects.

(2)

This pattern is repeated for every LAB in the LAB row.

(3)

The LABs in Figure 2–16 show the 16 possible logical outputs per LAB.

Primary

LAB (2)

R4 Interconnect

Driving Left

Adjacent LAB can

Drive onto Another

LAB's R4 Interconnect

C4 and C16

Column Interconnects (1)

R4 Interconnect

Driving Right

LAB

Neighbor

LAB

Neighbor

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