EX256-FCS100 ETC1 [List of Unclassifed Manufacturers], EX256-FCS100 Datasheet - Page 3

• Manufacturer Part Number: EX256-FCS100
• Description: eX Family FPGAs
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

e X F a m il y F P GA s
eX F am i l y A r c hi t e c t ur e
The eX family architecture uses a “sea-of-modules”
structure where the entire floor of the device is covered
with a grid of logic modules with virtually no chip area lost
to interconnect elements or routing. Interconnection
among these logic modules is achieved using Actel’s
patented
interconnect elements. Actel’s eX family provides two types
of logic modules, the register cell (R-cell) and the
combinatorial cell (C-cell).
The R-cell contains a flip-flop featuring asynchronous clear,
asynchronous preset, and clock enable (using the S0 and S1
lines) control signals
feature programmable clock polarity selectable on a
register-by-register basis. This provides additional flexibility
while allowing mapping of synthesized functions into the eX
FPGA. The clock source for the R-cell can be chosen from
either the hard-wired clock or the routed clock.
Figure 1 • R-Cell
Figure 2 • C-Cell
metal-to-metal
(Figure
DirectConnect
Internal Logic
programmable
DB
D3
1). The R-cell registers
D0
D1
D2
HCLK
CLKA,
CLKB,
Input
CKS
S0
antifuse
Data Input
Routed
A0 B0
v3.0
CKP
S1
The C-cell implements a range of combinatorial functions
up to 5 inputs
associated inverter function dramatically increases the
number
implemented in a single module from 800 options in
previous architectures to more than 4,000 in the eX
architecture.
M o d ule O r g a n i z a t io n
Actel has arranged all C-cell and R-cell logic modules into
horizontal banks called Clusters. The eX devices contain
one type of Cluster, which contains two C-cells and one
R-cell.
To increase design efficiency and device performance, Actel
has further organized these modules into SuperClusters
(Figure 3 on page
SuperClusters, which are two-wide groupings of one type of
clusters.
Sa
D
of
PSET
CLR
A1
(Figure
combinatorial
B1
Q
Sb
4). The eX devices contain one type of
2). Inclusion of the DB input and its
Y
Y
functions
that
can
be
3