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TMS320C6416T: EDMA transmit complete interrupt not triggered?

Part Number: TMS320C6416T

OS:NONE

CCS3.3

My program work flow is: FPGA trigger INT4(ever 0.5ms)----->ISR(INT4) start edma transmit(move data from EMIFA to L2 SRAM,need 150us to complete the tranfer),using TCC=10----->EDMA_int  ISR.

My problem is, when the EDMA transmit complete,the CPU interrupt (EDMA_int  INT8) is not triggered?And the problem happen rarely,Maybe happen once in an hour.