REV 3 - REV 5 - The beginning (ST536)

[terriblefire]

Nutcase.. :D

You still love me though :lol: :fire: :fire: :fire:

Well your the only one who'll let me lose on their forum.... mwhaahahahhaha,,,

[Icky]

Great work @exxos

Nice! :thumbup:

[Badwolf]

117.6MHz clock (58.8Mhz CPU)

Nutcase.. :D

Certifiable. :crazy:

BW

[exxos]

It looks like something really starts to struggle over 61Mhz. I have disabled the SDRAM as well.. I think it could just be the bus isolators.. I mean they take 20ns to disable... along with the ROM it is mostly moaning the ROM is having problems being accessed, and I have slowed its access right down as well. I put the plastic package one in which otherwise is working fine at 50 MHz, that one does not even boot up, so I assume it is the CPU actually tripping up and nothing else.

I am going to put a faster buffer on the next revision of the board. It is hard to find one that JLC stock , which are actually faster as well.

[terriblefire]

Yeah i never got 030s past 56-57Mhz without parts of them stopping to work. Think there is a fundamental limit somewhere there.

S

[exxos]

Yeah i never got 030s past 56-57Mhz without parts of them stopping to work. Think there is a fundamental limit somewhere there.

In terms of long-term stability 50Mhz seems to be about as high as you could really go anyway. I have ordered a couple of supposed different mask EC's to see if they are any different.

[exxos]

Been busy rerouting the buffer isolator chips... It went from two chips to one chip, the fastest one I can really find is a ABT version. About 7ns isolation time, the old ones were about 20ns.

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[exxos]

Feking Eagle libs :pullhair: :headbang: :cussing: :cussing:

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[exxos]

Some time later... hope it fits this time...

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EDIT:

Yep!

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[exxos]

The board was running most of yesterday at 50MHz on my H4...

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The results I was keeping a eye on.. The GEM dialog box ( actually that should probably be spelt dialogue ? :lol: ) It was interesting because in the morning the test was 300%.. And during the day when it all heated up in my room picked actually dropped to 299%.. And around midnight when it had dropped in temperature it went back up to 300% again! just goes to show how very small tolerances in hardware can affect things.

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