Sorry to miss some important informations and thanks for the help already.
Got the form LCSC (just 12 pcs - for first test) - packed in tray - so I don't think that they have been damaged during transport.
I've only tried new memtest .... but should make no difference.
Right orientation? YES - one time, maybe ... 4 times (I'm not Homer Simpson
) - NO - I've checked this, belive me.
No, the even not pass 70MHz
(automatic test dropping to 70MHz and error couter is running wild - manual -> same)
I have no real idea bout the problem.
Having EDS protected soldering place.
Using different methods of soldering (hotair and drag) (sorry no reflow available).
What I can say: No problems with the AS - I've only one board XS with passing 140MHz, all other doing 167MHz.
The universals one passing in most cases 160MHz (new test) and at least 150MHz.
So I don't think that it's caused by my soldering skills ....
I can also eliminate the boards - as I said: Having Winbond soldered - don't work at all .... removing the Winbond (hotair), cleaning pads and soldering AS ....
-> passing 167MHz.
I don't have any idea anymore yet - execpt:
1.) Got some damaged chips (either transport, picking, whatever)
2.) They need some other capacity (not to be expected - but who knows - the reson why I'm asking)
3.) They've problems on XS board (but cvenditti did also XS)
4.) I'm doing something constantly wrong (but I don't have any idea what it should be)
Thanks for your help.
The Winbond are not available at LCSC at the moment (placed order yesterday) and I've to place an order at Digikey anway - I'll go for some more AS