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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

 

 (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 (12)

on

on

off

VCCCIO0 (= 3.3V)
R131-R132+ assembly (23)

on

on

on

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(1) R131 soldered / R132 unsoldered

(2) R131 unsoldered / R132 soldered

Table 14: Slide switch S2 settings overview ( 1.2V , 2.5V, VCCIO0).

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