Actually, another question: how many data lines are actually routed to the CPLD?!
ah only the 16bit ST bus, but thats the upper word of the 030.. But like you say, if something drives the bus high (really it shouldn't be) then it would break the method anyway.
Honestly, I'd just wait for the next 8MHz edge or something.exxos wrote: ↑Mon Apr 05, 2021 3:46 pmah only the 16bit ST bus, but thats the upper word of the 030.. But like you say, if something drives the bus high (really it shouldn't be) then it would break the method anyway.
Is blue still ST-AS there? Why's it pulsing in between what appear to be normal bus accesses?exxos wrote: ↑Tue Apr 06, 2021 9:36 am
But more bonkers things going on, address strobe is high and DTACK is clearly pulsing when there is no possible way it could even do that.. unless I am missing something ?! there is no blitter or anything else on this machine I don't see how DTACK Is being driven. The PLD only has DTACK as a input, so I cannot see how the chip can even be driving that as a output unless the compiler is seriously screwing up somehow. I did have a span of the software ringing of a blank page for the design summary, intermittently not seen the PLD, and after a while it would not even let me copy and paste in the thing.. I think the more you use it the more it starts screwing up.
Both scope probes are on the 68K socket.. Because the code wasn't isolating ST_AS from AS30.. It is actually both ST_AS and AS30..Badwolf wrote: ↑Tue Apr 06, 2021 11:45 amIs blue still ST-AS there? Why's it pulsing in between what appear to be normal bus accesses?
To me that looks like blue is actually 030 AS and this is behaving perfectly normally with a load of 50MHz accesses (causing no DTACK) and then the occasional ST-RAM access (blue goes low followed ~250ns later by yellow both then terminate at the same time).
Wouldn't know how to do one even. Anything I can see a little odd is ST_DTACK does not always register as a high just before it locks up.. But it should not really affect anything anyway.