C6678的PCIE手册中,”CLASSCODE ID“在手册中是只读的,但是手册里面又说“writeable from internal bus interface”,这句话是什么意思??
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writeable from internal bus interface意思是可以通过本地BUS配置修改,只读仅仅指通过外部PCIE总线来的packet对该区域的修改权限