FPGA 中的警告：Warning: Some pins have incomplete I/O assignments （Missing drive strength and slew rate）

本文轉載自查看原文 2013-02-23 17:59 3875 FPGA

最近在FPGA程序全綜合時碰到了個奇怪的問題：

Warning: Some pins have incomplete I/O assignments. Refer to the I/O Assignment Warnings report for details

查看了compilation report-> I/O Assignment Warnings 提示是輸出管腳“ Missing drive strength and slew rate”。記得用過CycloneII芯片就不會出現這種警告，google了下，是因為后續高級的芯片的 drive strength 和 slew rate 都是可編程的。如果不指定的話，quartus會給出默認值並給出警告。消除警告的辦法是在pin planner 分配管腳時同時制定這兩個值。設置方法如下：

In the pin planner in the pin list there's a column called Current Strength.
If it doesn't show up there, right-click your mouse in the pin list and select customize columns.... You can add the currenth strenght column and select the desired drive strength.

網址：http://www.alteraforum.com/forum/showthread.php?t=24347

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