各位仁兄,現在對ATX的上電時序跟同事之間有異議,還請各位指點迷津.我查了ATX Guide,是這么說的:The +12 VDC and +5 VDC output levels must be equal to or greater than the +3.3 VDC output at all times during power-up and normal operation. The time between the +12 VDC or +5 VDC output reaching its minimum in-regulation level and +3.3 VDC reaching its minimum in-regulation level must be ≤ 20 ms.
按字面意思理解,就是說5V,12V先上電或同時上電.可同事給的要求卻是3.3V先上電.到底哪個對呢?還是我的理解有偏差.
還有,核心電壓和I/O口電壓哪個先上電?為什么呢?
貴求各位!謝謝!