SCI FIFO RX interrupt not triggering

Hi all,

I'm having trouble getting the SCIRX FIFO interrupt to trigger when it seems it should be.  I'm using the SCI-C module on a TMS320F2335.

I have the SCI-C RX FIFO register configured as such:

ScicRegs.SCIFFRX.all = 0x0061;

Which I believe should trigger an interrupt when the FIFO level is 1 or greater.

I think I have the interrupt configured properly in my main() function...

DINT;

InitPieCtrl();

IER = 0x0000;

IFR = 0x0000;

InitPieVectTable();

EALLOW;

PieVectTable.SCIRXINTC = &scicRxFifoIsr;

EDIS;

IER |= M_INT8;

PieCtrlRegs.PIECTRL.bit.ENPIE = 1;

PieCtrlRegs.PIEIER8.bit.INTx5 = 1;

EINT;

...but let me know if something looks amiss.  SCI-C RX is definitely receiving data, but no interrupt is generated.

Thanks so much for any and all help!

-sam