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6455与Xilinx V5用SRIO通信时,6455只能响应16次doorbell的问题

v5每隔几秒向6455发送doorbell,在SRIO用户层接口用Chipscope看信号,可以看到DSP只回发了16个doorbell响应,之后就不发响应了,而v5还可以继续发doorbell(最终发了49个不发了),这是为什么啊?调了好久了,没解决,求指导~~