Hi Maximilius26
80C390 has no flash inside. It's ROMless. I'm confident you know that and would like to fit and external flash and obvious program it.
One of the greatest feature of 80C390 is using the internal 4KB SRAM as combined program and data memory starting at 0x400000, loaded with bootstrap loader and run it without disturbing the 4MB external memory bus (0x00000 - 0x3FFFFF).
Can you be more specific what you want to do ?
Meanwhile, I shall take a look at demo provided by Winburn.
If you want to use that micro you should be aware of errata sheets for revision A1, B1, B2, B3 and B4.
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Some behaviours very annoying.
You can read the last data sheet released 03/06/03 as well.
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However for your design you must be aware of the maximum tAVIV1 that is 55ns for tMCS of 100ns, not so easily for most of the flash memory. Especially for the big one.
You can take a look at :
http://www.systronix.com/tutor/tini_help/restore.htm
for a good design 80C390 basis. Because I know you'll burn fingers to get these files, that's why you can find bellow.
For a better approach and obvious if you have some money to spend, try the development board. It's exactly what you are looking for: boots from lazy EPROM, move the code inside faster SRAM and go from there. Add to this the CAN features provided by board. I know it's expensive, don't tell me that !
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Regards,
Silvio