[转]vivado管脚分配：PACKAGE_PIN or LOC

最新推荐文章于 2025-05-29 13:59:24 发布

ddk43521

最新推荐文章于 2025-05-29 13:59:24 发布

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原文链接：http://www.cnblogs.com/tubujia/p/11169848.html

本文解释了在电子设计自动化(EDA)工具中，为何应当使用PACKAGE_PIN而非LOC属性来约束I/O端口的位置。尽管早期版本的Vivado等工具接受LOC属性，但未来版本可能仅支持PACKAGE_PIN。文章强调了PACKAGE_PIN属性的重要性，并说明了其与LOC属性的区别。

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The correct one is PACKAGE_PIN. If you do a "report_property" on the port you will see that it has both a LOC and a PACKAGE_PIN property. The LOC constraint is the location on the die, as in IOB_XnnYmm - its grid coordinates. The PACKAGE_PIN property is the name of the package pin to which it is connected. So the correct one is the PACKAGE_PIN.

However, both in UCF as well as in the earliest versions of Vivado, the LOC property was used. So, when you apply a LOC property to a port, it actually cheats, and assigns the value to the PACKAGE_PIN property instead. As a result, the net result is exactly the same if you assign the LOC or PACKAGE_PIN property - but PACKAGE_PIN is the correct one, and in some future version of the tool it may no longer accept LOC in place of PACKAGE_PIN.

转载于:https://www.cnblogs.com/tubujia/p/11169848.html