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在数据手册中，该寄存器类型为RW，且称“All combinations are supported with the exception of both ports 1 and 3 marked as disabled.”这是否意味着可以写入该register从而将port至为disable？如果可以，请问HUB内部的逻辑是将PHY至为disable，还是将PWRCTL至为disable，或是其他逻辑？
