eX Fam i l y FP G A s
4v3.0
Rou ti ng Res our ces
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 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 100 percent
automatic place-and-route software to minimize signal
propagation delays.
Figure 3 • Cluster Organization
Figure 4 • DirectConnect and FastConnect for Type 1 SuperClusters
Type 1 SuperCluster
Cluster 1
Cluster 1
R-Cell
C-Cell
D0
D1
D2
D3
DB
A0
B0
A1
B1
Sa
Sb
Y
DirectConnect
Input
CLKA,
CLKB,
Internal Logic
HCLK
CKS
CKP
CLR
PSET
Y
DQ
Routed
Data Input
S0
S1
Type 1 SuperClusters
DirectConnect
• No antifuses
• 0.1 ns routing delay
FastConnect
• One antifuse
• 0.3 ns routing delay
Routing Segments
• Typically 2 antifuses
• Max. 5 antifuses
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