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→Note on NVCC_AXEL_I/O_3.3V/1.8V usage
[[File:Axel-power-good.png]]
==== Note on NVCC_EIM_EXT ====
If the SPI NOR flash is mounted on the AXEL ULTRA SoM, the NVCC_EIM_EXT input signal can't be configured as an extended range voltage, but it must be connected to a +3.3V rail (because the SPI bus used internally for the NOR flash shares some pins of the EIM bank).
=== Power rails and related signals ===
