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尊敬的 Reed:
可以、如果 MAC 不需要 CRS 或 COL 引脚、那么可以将它们保持悬空/暂停状态。 PWRDOWN 也可以保持挂起状态、但最好使其保持已知状态、即上拉可避免其断电。
此致、
阿尔瓦罗