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  • When slide switch S2 is in the left position (FX2 PON = power rails conditionally on depending on signal FX2_PS_EN), signal PS_EN is set to signal FX2_PS_EN driven by the EZ-USB FX2LP USB FX2 microcontroller under user control.

    Figure 34: Slide switch S2 schematic.


    Figure 35: When slide switch S2 = FX2 PON, signal PS_EN is set to signal FX2_PS_EN driven by the EZ-USB FX2LP USB FX2 microcontroller under user control.
  • Signal PS_EN enables (high) or disables (low) power rails 2.5V and 1.2V.
    Image Added
    Figure 36:
  • According to the corresponding assembly option, power rail VCCCIO0 can depend or not on the 2.5V power rail.

  • Power-rail 3.3V is not controlled by signal PS_EN and is unconditionally enabled. 

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