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AM3354扩展第三块网口,用DM9000的问题

你好我正在做 335x扩展用DM9000第三块网口,搜了论坛里都是再GPMC上挂载,但是都不是用复用的方式,我目前用AD0-AD15,请教下DM9000上的CMD地址/数据切换信号,往哪接?ALE吗?,还是申请个GPIO自己操作?