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FPGA SPI Configuration Interface (CONTROL/STATUS) Pins: PD[3:1]  for every TE USB FX2 module:

  • INIT_B, DONE, FX2_PROG_B ( aka PROG_B (Spartan3E/ASpartan-3E and Spartan-3A) or PROGRAM_B (Spartan6)),Spartan-6).
Info
FX2_PS_EN (PD0) is used to control the signal PS_EN (if the switch FX2_ON is set to on), so it is not really part of the SPI Configuration Interface. The signal PS_EN could enable/disable some power rails.

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