RTSX-SU RadTolerant FPGAs (UMC)
Routing
R-cells and C-cells within 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. This routing architecture also dramatically
reduces the number of antifuses required to complete a
circuit, ensuring the highest possible performance
and
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 hardwired
signal path requiring no programmable interconnection to
achieve its fast signal propagation time of less than 0.1 ns.
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 a maximum interconnect
propagation delay of 0.4 ns.
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.
R-Cell
Routed
Data Input S1
S0
PRE
Direct
Connect
Input
HCLK
CLKA,
CLKB,
Internal Logic
D
Q
Y
D2
D3
D0
D1
C-Cell
Y
Sa
Sb
CLR
DB
CKS
CKP
A0 B0
A1 B1
Cluster 1
Cluster 1
Cluster 2
Cluster 1
Type 1 SuperCluster
Figure 1-2 •
R-Cell, C-Cell and Cluster Organization
Type 2 SuperCluster
v2.2
1-3
ACTEL [ Actel Corporation ]
