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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, 1.5 V and 2.5 V.

Figure 36: 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.

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 power rail 2.5V.

Image RemovedImage Added

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

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2V5V5VR131R132- 3VR131R132+

power rail	S1B= PON (PS_EN = 1) (PS_EN ≠ FX2_PS_EN) (Full power)	S1B = FX2 PON and PS_EN = FX2_PS_EN = 1 (Dynamic full power)	S1B = FX2 PON and PS_EN = FX2_PS_EN = 0 (Dynamic low power)
1.2 V	on	on	off
1.	5 V	on	on	off
2.	5 V	on	on	off
VCCCIO0 (= 2.	5 V)	R102-R103+	assembly ⁽¹⁾	on	on	off
VCCCIO0 (= 3.	3 V)	R102+R103-	assembly ⁽²⁾	on	on	on

⁽¹⁾ R131 soldered / R132 unsoldered R102 unpopulated / R103 populated

⁽²⁾ R131 unsoldered / R132 soldered R102 populated / R103 unpopulated

Table 40: Dip switch S1B settings overview ( 1.2 V, 1.2V 5 V , 2.5V5 V, VCCIO0).

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