(I/O) FPGA chip select signal output, connected to the nCS pin of the configuration device.
It is a dedicated output pin in AS mode and can be used as an I/O pin in PS and JTAG modes. In AS mode, this pin is an enable pin used by CII to send to the external serial configuration chip. In AS mode, ASDO has an internal pull-up resistor, which is always active. This pin is active low. Connect directly to the /CS pin (pin 1) of the configuration chip.
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