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TMS320F28388D: 关于EMIF接口地址位宽的疑问

Part Number: TMS320F28388D

在TRM文档中,EMIF1的地址位宽为22位,请问这是为什么呢?

数据手册中,External memory interface 1 address line 最大是19,那应该是20位的地址位宽吧