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This SysML diagram is far larger than usually recommended.
The Internal Block Diagram (IBD) shows the «chip» mcu:ATmega2560
with all «pin» Ports in the context of the Arduino Mega2560R3 board.
The chip is actually a square with 4 x 25 = 100 pins, the Port layout in the diagram does not reflect the geometry.
Later diagrams in this trail will show connections to specific pins according to function groups.