DD4 and DD7 pins functions on FT4232HQ

Question

DD4 connected LEDs and DD7 connected the jumper on FT4232HQ on Azure Sphere Standalone FTDI Interface Board.
https://github.com/Azure/azure-sphere-hardware-designs/blob/master/P-FTINT-1-1/P-FTINT-1-1.PDF

But DD4 and DD7 NOT connected on Azure Sphere MT3620 RDB.
https://github.com/Azure/azure-sphere-hardware-designs/blob/master/P-MT3620RDB-1-6/P-MT3620RDB-1-6%20(Production).PDF

Q1. What functions of pins?
Q2. Is it necessary to connect LEDs or jumper?

Answer 1

@matsujirushi thanks for your time!

From our Product Team:

"The Readme file indicates that R12, R13, R14 resistors are optional and need not be connected. We designed the interface board with the extra connections as a cheap way of future proofing. There was a possibility of using those extra pins as a way for our tools to signal to an operator if there was an error or to notify the operator that recovery had completed."

We will improve the documentation or\and the diagram to call this out specifically.

Thank you so much for your continuous feedback!

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