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6455 SRIO 如何配置1.25G,2.5G的数据率



我在做一个6455和V6的FPGA的SRIO通信,4X3.125G的通信可以成功,但我将两边都配置成1.25G或2.5G都无法建立通信,请问6455要配置lane的数据率是不是只用将MPY和TX和RX的datarate寄存器配置就可以了,还有一个现象是,我原来的3.125G用的是125M的Refclk,MPY选12.5,datarate是FULL,可以建立通信,后来我改成MPY选25,datarate是HALF,就无法建立通信了,请问专家这是怎么回事?

谢谢~