> On 2021-06-02, at 17:33, Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de> wrote: > >>> Do we know / have any data about what board/VIV-II combination is the most >>> prone to the said error? So far I was able to reliably reproduce it (with >>> VSP-Lab) using 250425 board and 6567R56A VIC-II (which is in fact quite >>> different from all other variants in respect to timings) but I need to test >>> it on PAL too. While I remember finding hardware combination exposing the >>> issue some good time ago but now I seem to be unable to find it again. >> It depends very much on the individual components on the board (PLA. RAMs, >> VICII, probably more). > > The PLA should not be involved since /RAS doesn't go through the PLA. Right! /CAS does. OTOH it can change between power cycles so who knows what factors affect it. > From how I understand how it works (address lines changing too close to /RAS going LOW), it would be a combination of VIC and RAMs and maybe clock jitter. Plus, of course, temperature. True. I am not looking for an exact recipe but am trying to increase my probability of finding a machine / combination of components which would expose the error at least somewhat repeatably. -- SD!Received on 2021-06-02 20:00:49
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