Bootstrap Pins - Sierra Wireless AirPrime BX3100 Hardware Integration Manual

Rev 3 Sep.18
Table 4-7: GPIO Pins (Alternate function)
Pin Signal Name Direction
9 GPIO(23)
16 GPIO(0)
17 GPIO(25)
18 GPIO(34)
19 GPIO(35)
24 GPIO(32)
25 GPIO(33)
26 GPIO(18)
27 GPIO(26)
31 GPIO(36)
32 GPIO(37)
34 GPIO(38)
36 GPIO(39)
42 GPIO(15)
43 GPIO(12)
44 GPIO(14)
45 GPIO(13)
46 GPIO(2)
47 GPIO(4)
53 GPIO(16)
54 GPIO(17)
a. Leave open any pins that are not used.
b. Internal configuration—no internal pull-ups
c. Pulled high internally
d. GPIO(15) default state (pull HIGH) enables UART boot messaging. To disable UART boot mes-
sages, drive GPIO(15) LOW prior to boot.
e. Pulled low internally

4.7 Bootstrap Pins

The GPIOs listed in Table 4-8
Default State
b
No pull
c
Pull high
b
No pull
b
No pull
b
No pull
b
No pull
b
No pull
b
No pull
b
No pull
b
No pull
b
I/O No pull
b
No pull
b
No pull
c d
Pull high
e
Pull low
c
Pull high
c
Pull high
e
Pull low
e
Pull low
b
No pull
b
No pull
are used as Bootstrap pins during start-up.
19
Interfaces Specification
a
Function Voltage Level
General purpose I/O VDD_PADS_BB
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