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3.4
Pull-Up During Configuration
The Pull-Up During Configuration signal (PUDC) is pulled to GND on the module; as PUDC is an active-low
signal, all FPGA I/Os will have the internal pull-up resistors enabled during device configuration.
If the application requires the pull-up during configuration to be disabled, this can be achieved by removing
R202 component and by mounting R203 - in this configuration the PUDC pin is connected to VCC_CFG_B14.
Figure 11 illustrates the configuration of the I/O signals during power-up. Figure 12 indicates the location of
the pull-up/pull-down resistors on the module PCB - lower right part on the top view drawing.
Figure 11: Pull-Up During Configuration (PUDC)
Figure 12: Pull-Up During Configuration (PUDC) Resistors - Assembly Drawing Top View (lower right part)
For details on the PUDC signal please refer to the 7 Series FPGAs Configuration User Guide [17].
3.5
JTAG
The JTAG interface can be used for configuring and debugging the FPGA logic. The JTAG signals on the
FPGA are directly connected to the module connector.
The FPGA device and the QSPI flash can be configured via JTAG using Xilinx tools.
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Version 06, 25.07.2019