银行内任何能够路由到阵列的其他部分或从阵列的其他部分路由的IO位置没有显着差异，因此允许该工具选择没有任何好处。
PCB布线的IO选择存在显着差异，因此这应该是分配引脚位置的驱动因素。
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以上来自于谷歌翻译
以下为原文
There is no significant difference in the any IO location within a bank to able to route to or from other parts of the array, so allowing the tool to choose has no benefit.
 
There is a significant difference in the selection of the IO for PCB routing, so this should be the driving factor in assigning pin locations.
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