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
Direct Link Interconnect
from Adjacent LAB
18 Direct Link Outputs
to Adjacent LABs
Direct Link Interconnect
from Adjacent LAB
C4 Interconnects
R4 Interconnects
36
Embedded Multiplier
LAB
LAB
18
18
16
16
5
Control
[35..0]
36
[35..0]
18
18
Row Interface
Block
Embedded Multiplier
to LAB Row Interface
Block Interconnect Region
36 Inputs per Row
36 Outputs per Row
LAB Block
Interconect Region
LAB Block
Interconect Region
C4 Interconnects
2–36
Altera Corporation
February 2007
Cyclone II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
