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DP83867IR: Reserved pins

Part Number: DP83867IR
Other Parts Discussed in Thread: TIDA-00204

Why are the Reserved pins (Pin 1, 7, 9 and 16) not connected?

I am referring to the TI Design (TIDA-00204). The design guide describes why the Not Connected Pins are not connected, but the reason for the Reserved pins is unknown.

EMI/EMC Compliant, Industrial Temp, Dual-Port Gigabit Ethernet Reference Design (Rev. B)
http://www.ti.com/lit/ug/tidu832b/tidu832b.pdf

Best regards,

Daisuke