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am572x datasheet 内DDR布线参数疑问。感谢!

am572x datasheet 内给出的布线规则见下图和下表。 这里给出的信号线长度单位是PS,不应该是mil吗,是不是单位搞错了,还是这里指的是信号的飞行时间?如果是飞行时间,这里该如何转换成长度呢(A1+A2是cpu到DDR信号线)