EX128-PTQG100 Datasheet, PDF (7/49 Pages) Actel Corporation – eX Family FPGAs

eX Family FPGAs
Routing Resources
Clusters and SuperClusters can be connected through the
use of two innovative local routing resources called
FastConnect and DirectConnect, which enable extremely
fast and predictable interconnection of modules within
Clusters and SuperClusters (Figure 1-4). This routing
architecture also dramatically reduces the number of
antifuses required to complete a circuit, ensuring the
highest possible performance.
DirectConnect is a horizontal routing resource that
provides connections from a C-cell to its neighboring R-
cell in a given SuperCluster. DirectConnect uses a hard-
wired signal path requiring no programmable
interconnection to achieve its fast signal propagation
time of less than 0.1 ns (–P speed grade).
FastConnect enables horizontal routing between any
two logic modules within a given SuperCluster and
vertical routing with the SuperCluster immediately
below it. Only one programmable connection is used in a
FastConnect path, delivering maximum pin-to-pin
propagation of 0.3 ns (–P speed grade).
In addition to DirectConnect and FastConnect, the
architecture makes use of two globally oriented routing
resources known as segmented routing and high-drive
routing. Actel’s segmented routing structure provides a
variety of track lengths for extremely fast routing
between SuperClusters. The exact combination of track
lengths and antifuses within each path is chosen by the
fully automatic place-and-route software to minimize
signal propagation delays.
SuperClusters
Figure 1-4 • DirectConnect and FastConnect for SuperClusters
DirectConnect
• No antifuses
• 0.1 ns routing delay
FastConnect
• One antifuse
• 0.5 ns routing delay
Routing Segments
• Typically 2 antifuses
• Max. 5 antifuses
v4.3
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