Data Sheet

THUNDERCOMM TurboX C403-C Datasheet
33
Boot Configuration Interface
Pin Name
PIN Location
Voltage
Type
Description
Notes
GPIO_45
114
P3
IO
Forced USB boot; Configurable I/O
GPIO_55
B26
P3
IO
Fast boot select bit 0 (configure external boot
device); WDOG_DISABLE.Configurable I/O
GPIO_56
A27
P3
IO
Fast boot select bit 1 (configure external boot
device); Configurable I/O
GPIO_57
B27
P3
IO
Fast boot select bit 2 (configure external boot
device); Configurable I/O
GPIO_49
118
P3
IO
Fast boot select bit 3 (configure external boot
device); Configurable I/O
Table 3-15 Sensor interrupt definition
Forced USB boot
During development or factory production, boot from USB_HS port are forced by using GPIO_45.
■FORCED_USB_BOOT (GPIO_45) always takes precedence, regardless of the state of the BOOT_CONFIG
GPIOs or FAST_BOOT_SEL fuses.
■FORCED_USB_BOOT is checked first during the boot device detection prior to BOOT_CONFIG GPIOs.
■GPIO_45 = 1 forces the SDM device to boot from USB_HS port.
Blow the FORCE_USB_BOOT_DISABLE fuse to disable the feature that forces USB boot using GPIO_45.
Figure 3-4Power on signal
Other boot configuration bits are listed in the table below, and do not have pull up on these IOs also.
Other Boot Configuration Interface
Pin Name
PIN Location
Voltage
Type
Description
Notes
GPIO_54
A26
P3
IO
Fast boot select bit 4 (configure external boot
device); Configurable I/O
GPIO_52
A26
P3
IO
Fast boot select bit 5 (configure external boot
device); Configurable I/O
GPIO_51
B24
P3
IO
Fast boot select bit 6 (configure external boot
device); Configurable I/O
GPIO_48
119
P3
IO
Fast boot select bit 7 (configure external boot
device); Configurable I/O
C40x SoM
GPIO_45
VREG_1.8 V