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本帖最后由 wpy 于 2012-5-22 12:57 编辑
文档名:Operating Requirements for Altera Devices Data Sheet.
原文地址:http://www.altera.com/literature/ds/dsoprq.pdf
第六页(第二段)说防止闩锁时说
The designer should ensure that the inputs cannot rise faster than the power supply at the VCCINT and VCCIO pins.
然而下面的一段却说
Increasing the length of the VCC and ground connections can reduce the chances of contention during hot-socketing. If metal “fingers” are used for the board connection, the VCC and ground fingers at the card edge should be longer than the logic connections。
如果增加VCC的连接长度,VCC的上升时间不就比输入信号上升的时间慢吗?总感觉有些矛盾 |
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