Project: HDMI/DVI out for STFM

[exxos]

My SR98 is outputting 5.05V, so be about the same as my "exxos psu"...

I will try running the ST + FPGA board on other voltages when I get home from work tomorrow.

[Icky]

My SR98 is outputting 5.05V, so be about the same as my "exxos psu"...

I will try running the ST + FPGA board on other voltages when I get home from work tomorrow.

Thought I would give this a go too.

So I started at 4.3V and although my floppy failed to work the board dropped to the desktop and has been sat there stable. No resets.

Of course I can’t load anything as the floppy is not recognised at that voltage.

Will start to up the voltage to see when resetting starts

[Smonson]

Thought I would give this a go too.

So I started at 4.3V and although my floppy failed to work the board dropped to the desktop and has been sat there stable. No resets.

Now that is interesting.

[exxos]

Icky, did you try a 4700uF across the shifter power rails ?

[Icky]

Thought I would give this a go too.

So I started at 4.3V and although my floppy failed to work the board dropped to the desktop and has been sat there stable. No resets.

Now that is interesting.

4.4V and I started getting resets not as many as I normally get.

Have gone back down to 4.3V managed to get my Gigafile working with it and am currently running GEMBench and it’s gone through one loop without resetting.

[Icky]

Icky, did you try a 4700uF across the shifter power rails ?

Currently have a 1000uF across the rails.

[Icky]

So any voltage for me above 4.3V up to 5V and the board resets. I didn’t go any higher.

[exxos]

Icky, did you try a 4700uF across the shifter power rails ?

Currently have a 1000uF across the rails.

Staring to sound like ringing or noise on a signal somewhere. Or indeed gnd bound across the FPGA board s even,

[Smonson]

This gives me hope that I might be able to reproduce the issue here, by using a different power supply. Excellent!

[Icky]

Would be interesting to see how troed’s behaves at different voltages. See if he can replicate the same behaviour I am experiencing.

Still at 4.3V and on 5th loop now in GEMBench and no resets.