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CCS/TMS320C6678: C6678 SRIO doorbell

Part Number: TMS320C6678

Tool/software: Code Composer Studio

Hello, I use C6678 and Xilinx K7 through SRIO communication. FPGA sent to C6678 doorbell, when sending 2023 times, C6678 cannot continue to trigger the interrupt. The interrupt I is mapped to the INTDST16, and and made clear the interrupt in interrupt operation. Excuse me, what is the reason?