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求问C6455的SRIO自环怎么设置?



求问C6455的SRIO自环怎么设置?

1、在SERDES之前的自环如何设置?除了PER_SET_CNTL的25位(LOOPBACK)还要设置其他的吗?

2、在SERDES之后的自环如何设置?看了SERDES_CFGRXn_CNTL和SERDES_CFGTXn_CNTL,还有SERDES_CFGn_CNTL,怎么没有自环的位呢?是不是6455不能这么自环啊?