Viesturs, the problem is in the rate of change of the ps. in other words how fast the 5 Volt is reached from startup. A switch-mode supply pumps up the output capacitor a little bit with each cycle of the switching circuit ( like a bicycle pump with a tyre). So if the ps is a bit cheap it might take some time before the capacitor is pumped up to 5 Volt. So that is why there is a ps. ready signal coming from the ps to the motherboard in the big ps plug.
maybe try putting a manual switch in the card 5Volt supply that you switch on as soon as the bios test screen comes up. At that point the ps is stable cause the computer has started, and it is early enough for linux, which has not started yet. At the same time the rise of the 5 Volt is guaranteed to be fast enough in this way. And see what happens. You never know. cheers j. On Sat, Nov 26, 2011 at 11:38 PM, Viesturs Lācis <viesturs.la...@gmail.com>wrote: > 2011/11/26 Jan de Kruyf <jan.de.kr...@gmail.com>: > > I seem to remember some long ago shit with the rise time of the 5V supply > > for some logic ICs. In fact I installed a DeltaTau board that > > hangs every other start-up because the start-up time of some PC > > power-supply that supplies it is too slow. > > > > Solution to that one: interlock the 5 Volt with the power-supply ready > > signal from the PSU. > > I am ready to test even craziest possible causes of the problem :)) > I suppose I could test it by measuring the voltage right before > starting EMC. Is that correct? I suspect I need something above 4V for > the card to work. > Another thing - Power LED on the card is shining, when I turn on the > PC, so I suspect that is a signal, that it receives 5V power. > > Viesturs > > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure > contains a definitive record of customers, application performance, > security threats, fraudulent activity, and more. Splunk takes this > data and makes sense of it. IT sense. And common sense. > http://p.sf.net/sfu/splunk-novd2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-novd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
