PADS中管脚交换的设置问题，swap=0/1/2

请问新建Part时将管脚的swap属性设为0是否就是表示在PCB自动布线时不允许该管脚被交换？而设置成其他数字，是否就表示在PCB自动布线时允许数字相同的管脚被交换。比如设为1，则表示该part中所有swap属性为1的管脚在PCB自动布线时允许被交换，且与其他数字比如swap=2 的管脚不能交换。请问我这样理解对吗？
file:///C:/Documents%20and%20Settings/Administrator/桌面/未命名.bmp

不知道 只知道 eco模式下可手工交换管脚

Setting Pin Swaps
Use Set Pin Swap to define a swap class for a terminal. Swapping information is used in the
PCB layout application for length minimization and routing optimization. The swap class is
assigned by a numeric value. The number for classes is 0, if the pin is not to be swapped under
any circumstances, and 1 through 99. A pin can be swapped with any other pin within the gate
that has the same swap class number.