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Minimig build for DE2 not working   Message List  
Reply | Forward Message #21 of 327 |
Re: Minimig build for DE2 not working

--- In minimigtg68@yahoogroups.com, "TobiFlex" <t.gubener@...> wrote:
> I have found the audio bug with channel 2 and 4 and also 2 TG68 CPU
bugs.

I'm just curious to know, is the audio problem related to the number
of samples made from the audio signal generated by the sigma modulator
in minimig/audio.v file ?

When looking at the source it seems as the samplerate in the DE2 is
only half of the speed and due to the clock sync only one channel is
picked up for the right and left audio channel instead of two.

My teammate has tried to correct it but the synthing results in
an unstable result and the system fails at boottime.

We would really like to know your view of the bug.

Also, we had issues with the first SD card we tried, a 2gb sandisc.
Switching to a 1gb Twinmos (minisd with adaptor) solved the problem.
The problem caused a rom failure and red screen lockup with sandisc.

The tg68core (68k core) looks like a real good work in our opinion =)

Best Regards Fredrik & Mattias







Mon Dec 17, 2007 9:45 am

videopac2k
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Message #21 of 327 |
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Hi, I've run the .sof Tobias has distributed with no problems. However, when I try to run my own build (Quartus v7.2) the system perpetually shows "loading...
Mark McDougall
tcdevelop
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Dec 15, 2007
5:10 am

Mark McDougall wrote: Well, I can't figure out why building the DE2 version won't work for me. To summarise again, Quartus v7.2 SP1, only change was the path...
Mark McDougall
tcdevelop
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Dec 17, 2007
4:12 am

... The .sof distributed with the source does *NOT* work on this DE2. The .sof distributed before the source release *DOES* work. What has changed??? Why...
Mark McDougall
tcdevelop
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Dec 17, 2007
7:16 am

Hi Marc, this is a timinig problem. Please remove all timing optimised Options from your Quartus Project. I hope I found today the time to rework the...
TobiFlex
tobiflexx
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Dec 17, 2007
8:00 am

... bugs. I'm just curious to know, is the audio problem related to the number of samples made from the audio signal generated by the sigma modulator in...
videopac2k
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Dec 17, 2007
9:45 am

I noticed in the sources for the PIC for the Original MiniMig, Dennis noted problems with SanDisk cards not following the standard and needing special tweaks. ...
fordp2002
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Dec 17, 2007
12:40 pm

... Probably worth checking how the card is formatted. the Z80 spihost is probably expecting FAT12 or FAT16. (Tobi?) Default filesystem for 2GB is most likely...
Leslie
redskulldc
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Dec 17, 2007
1:40 pm

... FAT16 was used on both cards that were tested. Best Regards Fredrik...
videopac2k
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Dec 17, 2007
1:59 pm
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