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EX256-CSG100 Datasheet(PDF) 5 Page - Actel Corporation

Part # EX256-CSG100
Description  eX Automotive Family FPGAs
Download  44 Pages
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Manufacturer  ACTEL [Actel Corporation]
Direct Link  http://www.actel.com
Logo ACTEL - Actel Corporation

EX256-CSG100 Datasheet(HTML) 5 Page - Actel Corporation

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eX Automotive Family FPGAs
v3.2
1-1
eX Automotive Family FPGAs
General Description
Based on a 0.22 µm CMOS process technology, the eX
family of FPGAs is a low-cost solution for low-power,
high-performance
designs.
With
the
automotive
temperature grade support (–40ºC to 125ºC), the eX
devices can address many in-cabin telematics and
automobile interconnect applications. The low-power
attributes inherent in antifuse technology make the eX
devices ideal for designers who are looking to integrate
low-density, power-sensitive automotive applications
into a programmable logic solution, enabling quick time-
to-market.
eX Family Architecture
The Actel eX family is implemented on a high-voltage
twin-well CMOS process using 0.22 µm design rules. 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
metal-to-metal
programmable
antifuse
interconnect elements. The antifuse interconnect is
made up of a combination of amorphous silicon and
dielectric material with barrier metals and has an "on"
state resistance of 25
Ω with a capacitance of 1.0 fF for
low-signal impedance. The antifuses are normally open
circuit and, when programmed, form a permanent low-
impedance connection. 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 (Figure 1-1). The R-cell
registers 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 hardwired clock or the
routed clock.
The C-cell implements a range of combinatorial functions
up to five inputs (Figure 1-2 on page 1-2). Inclusion of
the DB input and its associated inverter function enables
the implementation of more than 4,000 combinatorial
functions in the eX architecture in a single module.
Two C-cells can be combined together to create a flip-
flop to imitate an R-cell via the use of the CC macro. This
is particularly useful when implementing nontiming-
critical paths and when the design engineer is running
out of R-cells. For more information about the CC macro,
refer to the Actel Maximizing Logic Utilization in eX, SX
and SX-A FPGA Devices Using CC Macros application
note.
Figure 1-1 • R-Cell
DirectConnect
Input
CLKA,
CLKB,
Internal Logic
HCLK
CKS
CKP
CLR
PSET
Y
DQ
Routed
Data Input
S0
S1


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