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TMS320C28346: QEP detection of falling edge

Part Number: TMS320C28346

Hello,

I would like to configure the use of the eQEP to detect a falling edge in stand of a rising edge.

I looked at 

TMS320x2834x Delfino Enhanced Quadrature
Encoder Pulse (eQEP) Module
Reference Guide

and found QDECCTL.XCR writing the value of 1 will allow the detection of both falling and rising, however I'd like the detection of falling only.

I attempted to write '1' to both  QDECCTL.QAP and QDECCTL.QBP to reverse both polarities however testing shows that regardless of the value written the detection is for a falling edge.

My question is how do I configure the detection of falling or edge only QEPA QEPB.

BR