Altera Corporation
2–25
May 2007
Stratix II Device Handbook, Volume 1
Stratix II Architecture
Figure 2–17. Shared Arithmetic Chain, Carry Chain & Register Chain
Interconnects
The C4 interconnects span four LABs, M512, or M4K blocks up or down
from a source LAB. Every LAB has its own set of C4 interconnects to drive
either up or down.
Figure 2–18 shows the C4 interconnect connections
from an LAB in a column. The C4 interconnects can drive and be driven
by all types of architecture blocks, including DSP blocks, TriMatrix
memory blocks, and column and row IOEs. For LAB interconnection, a
primary LAB or its LAB neighbor can drive a given C4 interconnect. C4
interconnects can drive each other to extend their range as well as drive
row interconnects for column-to-column connections.
ALM 1
ALM 2
ALM 3
ALM 4
ALM 5
ALM 6
ALM 8
ALM 7
Carry Chain & Shared
Arithmetic Chain
Routing to Adjacent ALM
Local
Interconnect
Register Chain
Routing to Adjacent
ALM's Register Inpu
Local Interconnect
Routing Among ALMs
in the LAB
