EP2C5F256C7N Datasheet, PDF (48/168 Pages) Altera Corporation – Section I. Cyclone II Device Family Data Sheet

Embedded Multipliers
Embedded Multiplier Routing Interface
The R4, C4, and direct link interconnects from adjacent LABs drive the
embedded multiplier row interface interconnect. The embedded
multipliers can communicate with LABs on either the left or right side
through these row resources or with LAB columns on either the right or
left with the column resources. Up to 16 direct link input connections to
the embedded multiplier are possible from the left adjacent LABs and
another 16 possible from the right adjacent LAB. Embedded multiplier
outputs can also connect to left and right LABs through 18 direct link
interconnects each. Figure 2–19 shows the embedded multiplier to logic
array interface.
Figure 2–19. Embedded Multiplier LAB Row Interface
C4 Interconnects
Direct Link Interconnect
from Adjacent LAB
R4 Interconnects
18 Direct Link Outputs Direct Link Interconnect
to Adjacent LABs
from Adjacent LAB
LAB
16
36
Embedded Multiplier
18
18
LAB
16
5
Control
36
[35..0]
18
[35..0]
18
LAB Block
Interconect Region
Row Interface
Block
Embedded Multiplier
to LAB Row Interface
Block Interconnect Region
36 Inputs per Row
36 Outputs per Row
LAB Block
Interconect Region
C4 Interconnects
2–36
Cyclone II Device Handbook, Volume 1
Altera Corporation
February 2007