SX Family FPGAs
Chip Architecture
The SX family chip architecture provides a unique
approach to module organization and chip routing that
delivers the best register/logic mix for a wide variety of
new and emerging applications.
Module Organization
Actel has arranged all C-cell and R-cell logic modules into
horizontal banks called
clusters.
There are two types of
clusters:
Type 1 contains two C-cells and one R-cell, while
Type 2 contains one C-cell and two R-cells.
To increase design efficiency and device performance,
Actel has further organized these modules into
SuperClusters
SuperCluster 1 is a two-wide
grouping of Type 1 clusters. SuperCluster 2 is a two-wide
group containing one Type 1 cluster and one Type 2
cluster. SX devices feature more SuperCluster 1 modules
than SuperCluster 2 modules because designers typically
require significantly more combinatorial logic than flip-
flops.
D0
D1
Y
D2
D3
Sa
Sb
DB
A0
B0
A1
B1
Figure 1-3 •
C-Cell
R-Cell
D0
Routed Data Input
S0
S1
PSETB
Direct
Connect
Input
HCLK
CLKA, CLKB,
Internal Logic
CKS
CKP
CLRB
DB
D2
D
Q
Y
D3
D1
C-Cell
Y
Sa
Sb
A0
B0
A1
B1
Cluster 1
Cluster 2
Cluster 2
Cluster 1
Type 1 SuperCluster
Figure 1-4 •
Cluster Organization
Type 2 SuperCluster
v3.2
1-3
ACTEL [ Actel Corporation ]
