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TMS320F28379D: SPRUHM81 REV 2019 missing GPIO chapter

Part Number: TMS320F28379D

I'm using the LaunchPadXL TMS320F28379D LAUNCH PAD.  I've downloaded SPRUHM81 Rev September 2019.  It contains references to the peripherals but the GPIO chapter is missing.

Several chapters reference it but it doesn't seem to exist.  Can someone point me to it?