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S2 position	Effect on 1.2 V and 2.5 V rails
FX2 PON (on)⁽¹⁾	1.2 V and 2.5 V rails controlled by USB FX2 microcontroller (signal FX2_PS_EN)
PON (off)	1.2 V and 2.5 V rails always enabled

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⁽¹⁾ default: FX2 PON

Table 14: Slide switch S2 settings overview (1.2 V and 2.5 V rails only).

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power rail	S2= PON	S2 = FX2 PON and PS_EN = FX2_PS_EN = 1	S2 = FX2 PON and PS_EN = FX2_PS_EN = 0
1.2V	on	on	off
2.5V	on	on	off
VCCCIO0 (= 2.5V) R131+R132- assembly ⁽²⁾	on	on	off
VCCCIO0 (= 3.3V) R131-R132+ assembly ⁽³⁾	on	on	on

⁽¹²⁾ R131 soldered / R132 unsoldered

⁽²³⁾ R131 unsoldered / R132 soldered

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