Pin Function Grouping

0:35

Consulting file search options.

You're right. For a usable symbol, each pin should appear in exactly one section, not repeated across multiple overlapping groups. The pin-grouping guidance is explicit that every pin on a complex IC should belong to exactly one sub-symbol/section, and the grouping should use the most common primary function for readability rather than listing every alternate mux function

So the cleaner rule is:

One pin = one section
Use the pin's primary/common schematic role
Do not duplicate a pin just because it also supports USB, ADC, JTAG, touch, etc.
Power and ground stay in a dedicated Power/Ground area

Better exclusive grouping

For this module, I would assign pins like this:

Power

3V3

Ground

GND_1
GND_2
EPAD

Control

Strapping / Boot

IO0
IO45
IO46

Debug

IO39
IO40
IO41
IO42

Communication

TXD0
RXD0
IO17
IO18
IO19
IO20

GPIO / Analog

IO1
IO2
IO3
IO4
IO5
IO6
IO7
IO8
IO9
IO10
IO11
IO12
IO13
IO14
IO15
IO16
IO21
IO35
IO36
IO37
IO38
IO47
IO48

Why this is better

Because pins like:

IO19/IO20 can be USB and GPIO
IO39-IO42 can be GPIO and JTAG
IO1-IO14 can be GPIO and ADC/touch

…but for symbol organization, you normally pick one dominant bucket only. That matches the recommended practice of assigning each pin one section and one sub-symbol instead of duplicating multifunction pins across categories

Practical recommendation

If you're building the part in Flux, I’d use these sections:

Table

Section	Pins
Power	3V3
Ground	GND_1, GND_2, EPAD
Control	EN
Strapping	IO0, IO45, IO46
Debug	IO39, IO40, IO41, IO42
Communication	TXD0, RXD0, IO17, IO18, IO19, IO20
GPIO	IO1-IO16, IO21, IO35-IO38, IO47, IO48

If you want, I can next turn that into a clean pin property table with:

Pin name
Pin number
Section
Pin Group
Pin Type
Sub-symbol suffix

with no duplicated pins at all.

Skip duplicate pins

Clean up IO1 groups

One canonical function

Prioritize primary function

8 days

IO41

IO4

IO20

GND_5

IO18

IO1

IO11

IO7

IO15

IO19

GND_10

IO35

IO37

IO8

IO2

GND_6

IO3

GND_8

IO14

IO42

GND_7

IO5

IO40

IO39

GND_9

IO6

IO46

IO12

IO38

IO9

IO16

RXD0

IO13

GND_2

IO21

IO10

GND_4

GND_3

IO47

IO48

IO17

TXD0

IO36

GND_11

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