各位仁兄,现在对ATX的上电时序跟同事之间有异议,还请各位指点迷津.我查了ATX Guide,是这么说的: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,就是说5V,12V先上电或同时上电.可同事给的要求却是3.3V先上电.到底哪个对呢?还是我的理解有偏差.
还有,核心电压和I/O口电压哪个先上电?为什么呢?
贵求各位!谢谢!
