EP2A15 Datasheet, PDF (22/99 Pages) Altera Corporation – Programmable Logic Device Family

APEX II Programmable Logic Device Family Data Sheet
Figure 11. Driving the FastTrack Interconnect
Row
Interconnect
MegaLAB
Interconnect
Column
Interconnect
LE
Local
Interconnect
APEX II devices feature FastRow^TM lines for quickly routing input signals
with high fan-out. Column I/O pins can drive the FastRow interconnect,
which routes signals directly into the local interconnect without having to
drive through the MegaLAB interconnect. FastRow lines traverse two
MegaLAB structures. The FastRow interconnect drives the four
MegaLABs in the top row and the four MegaLABs in the bottom row of
the device. The FastRow interconnect drives all local interconnects in the
appropriate MegaLABs. Column pins using the FastRow interconnect
achieve a faster set-up time, because the signal does not need to use a
MegaLab interconnect line to reach the destination LE. Figure 12 shows
the FastRow interconnect.
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Altera Corporation