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Table from EZ-USB(R) Technical Reference Manual (EZ-USB_TRM.pdf)
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Signal PS_EN
Signal PS_EN enables (1) or disables (0) power rails 1.2 V, 1.5 V and 2.5 V.
Scroll pdf title title Power rails 1.2 V, 1.5 V and 2.5 V could be enabled/disabled by signal PS_EN. 
Power-rail 3.3V is not controlled by signal PS_EN and is unconditionally enabled.
Scroll pdf title title Power rails 3.3V could not be enabled/disabled by signal PS_EN. 
VCCIO assembly options
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| According to the corresponding assembly option, power rail VCCCIO0 (enabled by PS_EN and switch S1B ) can depend or not on the power rail 2.5V. |
VCCIO0 voltage can be configured in 3 ways:
- 2.5V - When resistor R103 is populated and resistor R102 is not populated.
- 3.3V - When R103 is not populated and resistor R102 is populated.
- 1.2 V ÷ 3.3 V (External supply) - When R103 is not populated and R102 is not populated. In this case external supply source have to be connected to pins 1, 2, 3, 4 of J4 B2B connector(1).
(1) See Spartan-6 documentation fo VCCIO power range.
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See section "FPGA I/O banks power supply" here.
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| Others options of VCCIO0 power supply are not supported and can damage the FPGA! |
See the figure below to locate R102 and R103 on PCB.
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Dip Switch S1B = FX2 PON
When Dip switch S1B 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 (PS_EN = FX2_PS_EN) driven by the EZ-USB FX2LP USB FX2 microcontroller under user control (IOD and OED of fw.c).
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