XC3S100E-4CP132GI XILINX [Xilinx, Inc], XC3S100E-4CP132GI Datasheet - Page 111

• Manufacturer Part Number: XC3S100E-4CP132GI
• Description: Spartan-3E FPGA Family: Complete Data Sheet
• Manufacturer: XILINX [Xilinx, Inc]

Powering Spartan-3E FPGAs
Voltage Supplies
Like Spartan-3 FPGAs, Spartan-3E FPGAs have multiple
voltage supply inputs, as shown in
supply inputs for internal logic functions, V
V
Table 69: Spartan-3E Voltage Supplies
In a 3.3V-only application, all four V
3.3V. However, Spartan-3E FPGAs provide the ability to
bridge between different I/O voltages and standards by
applying different voltages to the V
banks. Refer to
can be intermixed within a single I/O bank.
Each I/O bank also has an separate, optional input voltage
reference supply, called V
I/O standard that requires a voltage reference such as
HSTL or SSTL, then all V
be connected to the same voltage.
Voltage Regulators
Various power supply manufacturers offer complete power
solutions for Xilinx FPGAs including some with integrated
three-rail regulators specifically designed for Spartan-3 and
Spartan-3E FPGAs. The
vides links to vendor solution guides and Xilinx power esti-
mation and analysis tools.
Power Distribution System (PDS) Design and
Decoupling/Bypass Capacitors
Good power distribution system (PDS) design is important
for all FPGA designs, but especially so for high perfor-
DS312-2 (v3.4) November 9, 2006
Product Specification
CCAUX
VCCO_0
VCCO_1
VCCO_2
VCCO_3
V
Supply
V
Input
CCAUX
CCINT
. Each of the four I/O banks has a separate V
R
Internal core supply voltage. Supplies all internal logic functions, such as CLBs,
block RAM, and multipliers. Input to Power-On Reset (POR) circuit.
Auxiliary supply voltage. Supplies Digital Clock Managers (DCMs), differential
drivers, dedicated configuration pins, JTAG interface. Input to Power-On Reset
(POR) circuit.
Supplies the output buffers in I/O Bank 0, the bank along the top edge of the
FPGA.
Supplies the output buffers in I/O Bank 1, the bank along the right edge of the
FPGA. In
connects to the same voltage as the Flash PROM.
Supplies the output buffers in I/O Bank 2, the bank along the bottom edge of the
FPGA. Connects to the same voltage as the FPGA configuration source. Input
to Power-On Reset (POR) circuit.
Supplies the output buffers in I/O Bank 3, the bank along the left edge of the
FPGA.
I/O Banking Rules
Byte-Wide Peripheral Interface (BPI) Parallel Flash
REF
Xilinx Power Corner
REF
. If the I/O bank includes an
pins within the I/O bank must
Table
CCO
for which I/O standards
CCO
supplies connect to
69. There are two
inputs of different
website pro-
CCINT
Description
www.xilinx.com
CCO
and
supply input that powers the output buffers within the asso-
ciated I/O bank. All of the V
bank must be connected and must connect to the same
voltage.
mance applications, greater than 100 MHz. Proper design
results in better overall performance, lower clock and DCM
jitter, and a generally more robust system. Before designing
the printed circuit board (PCB) for the FPGA design, please
review XAPP623: Power Distribution System (PDS) Design:
Using Bypass/Decoupling Capacitors.
Power-On Behavior
Spartan-3E FPGAs have a built-in Power-On Reset (POR)
circuit that monitors the three power rails required to suc-
cessfully configure the FPGA. At power-up, the POR circuit
holds the FPGA in a reset state until the V
and V
threshold levels (see
supplies reach their respective thresholds, the POR reset is
released and the FPGA begins its configuration process.
Supply Sequencing
Because the three FPGA supply inputs must be valid to
release the POR reset and can be supplied in any order,
there are no FPGA-specific voltage sequencing require-
ments. Applying the FPGA’s V
V
CCINT
CCO
supply uses the least I
Bank 2 supplies reach their respective input
Mode,
Table 73
CCO
CCINT
in Module 3). After all three
connections to a specific I/O
CCAUX
Selectable, 3.3V, 2.5V,
Selectable, 3.3V, 2.5V,
Selectable, 3.3V, 2.5V,
Selectable, 3.3V, 2.5V,
Functional Description
current.
1.8, 1.5V, or 1.2V
1.8, 1.5V, or 1.2V
1.8, 1.5V, or 1.2V
1.8, 1.5V, or 1.2V
Nominal Supply
supply before the
Voltage
1.2V
2.5V
CCINT
, V
CCAUX
111
,