If you scroll down to the entry for opb_uartlite_0 sopb, which you just added, you'll see that it has no connections (all three bus squares are blank).

如果向下滚动到刚刚添加的opb_uartlite_0 sopb条目，会看到它没有连接(所有三个总线方框都是空的)。

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You could also draw them as a 2 wire bus using the bus and bus Entry tools.

您还可以使用总线和总线输入工具将它们绘制为2线总线。

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The first level MMU entry may contain an invalid entry or it contains a 2nd level page table address that gives a bus error when accessed.

第一级MMU条目可能包含一个无效的条目或它包含了2 第二级页表的访问时，给出了一个的总线错误的地址。

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