XC3S100E-4CP132GI XILINX [Xilinx, Inc], XC3S100E-4CP132GI Datasheet - Page 20
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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Functional Description
are weakly pulled down (PULLDOWN). The designer can
control how the unused I/Os are terminated after GTS is
released by setting the Bitstream Generator (BitGen) option
UnusedPin to PULLUP, PULLDOWN, or FLOAT.
One clock cycle later (default), the Global Write Enable
(GWE) net is released allowing the RAM and registers to
change states. Once in User mode, any pull-up resistors
enabled by HSWAP revert to the user settings and HSWAP
is available as a general-purpose I/O. For more information
on PULLUP and PULLDOWN, see
Resistors.
20
Pull-Up and Pull-Down
www.xilinx.com
Behavior of Unused I/O Pins After
Configuration
By default, the Xilinx ISE development software automati-
cally configures all unused I/O pins as input pins with indi-
vidual internal pull-down resistors to GND.
This default behavior is controlled by the UnusedPin bit-
stream generator (BitGen) option, as described in
JTAG Boundary-Scan Capability
All Spartan-3E IOBs support boundary-scan testing com-
patible with IEEE 1149.1/1532 standards. See
for more information on programming via JTAG.
DS312-2 (v3.4) November 9, 2006
Product Specification
JTAG Mode
Table
68.
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