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Sport Frame Sync Edge detection

Category: Hardware
Product Number: ADSP-CM409F

We have 2 SPORT halves configured. SPORT 0 A is the transmitter and SPORT0 B receiver. SPORT0 B is configured interrupt mode, external clock, external Frame Sync. If SPORT0 B is configured as follows: 

if((retCode = adi_sport_ConfigFrameSync(sportRxHandle, 32,
true, false, false, false, false,
false)) != ADI_SPORT_SUCCESS) 

which is frame sync required, external, active high, NO late FS, no edge. Things work OK.  But if I turn on edge frame sync, then the receiver never detects frame sync. What am I missing?????