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tms320c6455的PCI接口问题

请问专家,如果DSP的PCI和HPI接口我都不用的话,那么我将PCI_EN上拉,即,使能PCI功能,PCI模块的输入输出引脚我该空接还是下拉到地?如果下拉应该多大的电阻?我在手册上没有看到相关的解决方案啊。