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S1B position

Default position

Effect on 1.2 V, 1.5 V and 2.5 V rails

FX2 PON (off, open)

1.2 V and 2.5 V rails controlled by USB FX2 microcontroller (signal FX2_PS_EN)

PS_EN = FX2_PS_EN = 1 or 0

PON (on, closed)

1.2 V and 2.5 V rails always enabled (PS_EN = 1)

PS_EN ≠ FX_PS_EN = 1 or 0

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Port D Pin	Alternate Function	Alternate Function is Selected By...	Alternate Function is Described in...
PD.[7:0]	FD[15:8]	IFCFG1 = 1 and any WORDWIIDE bit = 1	Slave FIFOs chapter 9 on page 99

Table from EZ-USB(R) Technical Reference Manual (EZ-USB_TRM.pdf).

Signal PS_EN enables (1) or disables (0) power rails 1.2 V, 1.5V 5 V and 12.2V5 V.

Figure 36: Power rails 1.2 V, 1.5V 5 V and 12.2V 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.

Figure 37: Power rails 3.3V could not be enabled/disabled by signal PS_EN.

According to the corresponding assembly option, power rail VCCCIO0 can depend or not on the 2.5V power rail.

Figure 37: example of VCCIO0 assembly not dependent on 2.5V power rail. The other way is also possible.

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