Boot - Digi ConnectCore 8X Hardware Design Manuallines And Checklist

Design checklist
☑ Item
5.
Unconnected
power rails

Boot

☑ Item
1. BOOT_MODE
[1:0]
2.
Recover/Debug
mode (USB)
ConnectCore 8X Hardware Design Guidelines
Description
By default, leave the following power rails unconnected:
VCC_SNVS_LDO_1V8
n
VDD_PCIE_DIG
n
VDD_EMMC0
n
NVCC_MIPI_CSI_DSI
n
Although these signals are not used externally, it may be helpful to leave them
accessible for debugging (test points).
Description
These lines select the boot mode of the SOM:
BOOT_MODE1 BOOT_MODE0
0 0
0 1
1 0
1 1
Digi recommends you configure the boot mode lines to boot by default from
the internal eMMC of the module. This means:
BOOT_MODE0 pulled-down through 100 K resistor
n
BOOT_MODE1 pulled-high through 4.7 K resistor
n
See the ConnectCore 8X System-on-Module Hardware Reference Manual
detailed information about the boot modes available on the SOM.
Note BOOT_MODE0 is internally pulled-low. In the castellated version, only
BOOT_MODE1 is available externally.
To allow the system to boot from USB as a recovery/debug method, Digi
recommends you add switches to quickly switch between the different boot
Boot mode switches for selecting the boot source of the module
modes. See
Description
Boot from fuses
Serial downloader
Boot from board settings
Reserved
Boot
for
.
8