XC3S100E-4CP132GI XILINX [Xilinx, Inc], XC3S100E-4CP132GI Datasheet - Page 19
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XC3S100E-4CP132GI
Manufacturer Part Number
XC3S100E-4CP132GI
Description
Spartan-3E FPGA Family: Complete Data Sheet
Manufacturer
XILINX [Xilinx, Inc]
Datasheet
1.XC3S100E-4CP132GI.pdf
(231 pages)
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These differences are outlined for each package, such as
pins that are unconnected on one device but connected on
another in the same package or pins that are dedicated
inputs on one package but full I/O on another. When design-
ing the printed circuit board (PCB), plan for potential future
upgrades and package migration.
The Spartan-3E family is not pin-compatible with any previ-
ous Xilinx FPGA family.
Dedicated Inputs
Dedicated Inputs are IOBs used only as inputs. Pin names
designate a Dedicated Input if the name starts with IP, for
example, IP or IP_Lxxx_x. Dedicated inputs retain the full
functionality of the IOB for input functions with a single
exception for differential inputs (IP_Lxxx_x). For the differ-
ential Dedicated Inputs, the on-chip differential termination
is not available. To replace the on-chip differential termina-
tion, choose a differential pair that supports outputs
(IO_Lxxx_x) or use an external 100Ω termination resistor on
the board.
ESD Protection
Clamp diodes protect all device pads against damage from
Electro-Static Discharge (ESD) as well as excessive voltage
transients. Each I/O has two clamp diodes: one diode
extends P-to-N from the pad to V
extends N-to-P from the pad to GND. During operation,
these diodes are normally biased in the off state. These
clamp diodes are always connected to the pad, regardless
of the signal standard selected. The presence of diodes lim-
its the ability of Spartan-3E I/Os to tolerate high signal volt-
ages. The V
and Switching Characteristics
voltage range that I/Os can tolerate.
DS312-2 (v3.4) November 9, 2006
Product Specification
R
IN
absolute maximum rating in
CCO
(Module 3) specifies the
and a second diode
Table 72
of
www.xilinx.com
DC
Supply Voltages for the IOBs
The IOBs are powered by three supplies:
1. The V
2. V
3. V
I/O and Input-Only Pin Behavior During
Power-On, Configuration, and User Mode
In this section, all behavior described for I/O pins also
applies to input-only pins and dual-purpose I/O pins that are
not actively involved in the currently-selected configuration
mode.
All I/O pins have ESD clamp diodes to their respective V
supply and from GND, as shown in
(1.2V), V
any order. Before the FPGA can start its configuration pro-
cess, V
their respective minimum recommended operating levels
indicated in
high-impedance state. V
serve as inputs to the internal Power-On Reset circuit
(POR).
A Low level applied to the HSWAP input enables pull-up
resistors on user-I/O and input-only pins from power-on
throughout configuration. A High level on HSWAP disables
the pull-up resistors, allowing the I/Os to float. HSWAP con-
tains a weak pull-up and defaults to High if left floating. As
soon as power is applied, the FPGA begins initializing its
configuration memory. At the same time, the FPGA inter-
nally asserts the Global Set-Reset (GSR), which asynchro-
nously resets all IOB storage elements to a default Low
state. Also see
Upon the completion of initialization and the beginning of
configuration, INIT_B goes High, sampling the M0, M1, and
M2 inputs to determine the configuration mode. Configura-
tion data is then loaded into the FPGA. The I/O drivers
remain in a high-impedance state (with or without pull-up
resistors, as determined by the HSWAP input) throughout
configuration.
At the end of configuration, the GSR net is released, placing
the IOB registers in a Low state by default, unless the
loaded design reverses the polarity of their respective SR
inputs.
The Global Three State (GTS) net is released during
Start-Up, marking the end of configuration and the begin-
ning of design operation in the User mode. After the GTS
net is released, all user I/Os go active while all unused I/Os
banks, power the output drivers. The voltage on the
V
signal.
logic.
optimize the performance of various FPGA functions
such as I/O switching.
CCO
CCINT
CCAUX
CCINT
CCAUX
CCO
pins determines the voltage swing of the output
is the main power supply for the FPGA’s internal
Table
is an auxiliary source of power, primarily to
, V
supplies, one for each of the FPGA’s I/O
CCO
Pin Behavior During
(2.5V), and V
73. At this time, all output drivers are in a
Bank 2, and V
CCO
CCO
Bank 2, V
supplies can be applied in
CCAUX
Functional Description
Figure
Configuration.
CCINT
must have reached
5. The V
, and V
CCAUX
CCINT
CCO
19
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