TM4C123GH6PZT core board

The schematic and PCB design notes

begin with two LDO step-down converters, each with LED indicators. The 3.3V_P output is for external use, primarily to prevent accidentally burning out the MCU while programming one 3.3V output. TI MCUs are quite expensive, so this prevents accidental programming of a 3.3V output that could damage the MCU. Although there's a 3.3V header, external power supply is not recommended. Use 3.3V_P for external power
. Regarding external power to the core board, a 5V input is recommended. The board uses two diodes for 5V to prevent reverse current, so a higher voltage can be supplied to the 5V header for external power, but since it's an LDO, a large voltage difference is not advised.
For the microcontroller's USB, R155, R54, and R153 can be removed. They were included here because it's a direct copy of the STM32F1 board, but they're not actually used.
The only user-defined I/O on the board is the LED on PB4, which can be used to indicate the board is still functional.
A debugging interface is provided here; my J-Link is perfectly adequate for testing.

The physical product demonstration is shown
in two attached pictures.
Note that
most of the boards are 0603 packaged. Soldering the 0402 packaged capacitors around the MCU is inconvenient. You can consider using a stencil, which will make soldering much easier.