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AM5728: AM5728的SYSBOOT

Part Number: AM5728

AM5728的SYSBOOT[5..0]是用来选择Boot启动项的,需要做上下来处理,这个能理解,我的问题是,SYSBOOT[15..6](就是GPMC_AD6.....GPMC_AD15)为啥还需要上拉下拉?我看官方的demo原理图和其他人的原理图,都有上下来

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