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  1. Dynamic full power operation (PS_EN = 1): when the EZ-USB FX2LP USB FX2 microcontroller sets signal PS_EN = FX2_PS_EN = 1, power rails 2.5V and 1.2V are enabled.
    This setting can be useful for .
  2. Dynamic low power operation (PS_EN = 0): when the EZ-USB FX2LP USB FX2 microcontroller resets signal PS_EN = FX2_PS_EN = 0, the following components are switched off:
  • FPGA core logic (1.2V)
  • DDR SDRAM (2.5V)
  • FPGA bank 3 (2.5V)
  • VREF (2.5V)
  • VCCCIO0 (2.5V) FPGA bank 0

Slide Switch S3 = PON 

Full power operation (PS_EN = 1): when slide switch S3 is in the right position (PON = power rails unconditionally on), signal PS_EN is set to power rail 3.3V. Thus power rails 2.5V and 1.2V are unconditionally enabled.

 
Figure 39: S3 on position PON (PS_EN ≠ FX2_PS_EN = x; PS_EN = high ). 

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Table 40: Slide switch S3 settings overview ( 1.2V , 2.5V, VCCIO0).

 Alternate Assembly Options for Slide Switch S3 (on the User Manual ODT does not exist ???)