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by mikej
Sat Dec 15, 2012 10:40 pm
Forum: Megadrive/Genesis
Topic: M68000 Microcode-level emulation
Replies: 18
Views: 48775

There are more details in the document, mail me and I can send you a copy.
The data and control blocks are described a little more clearly than the patents.
/Mike
by mikej
Sat Dec 15, 2012 1:37 am
Forum: Megadrive/Genesis
Topic: M68000 Microcode-level emulation
Replies: 18
Views: 48775

Just to clarify this mode is for testing the PLAs that do instruction decoding, but you can't actually read out the PLA contents directly nor can you read out the microcode ROM.

You could run all possible inputs through the PLAs and determine the results of the logic which might be useful for ...
by mikej
Fri Dec 14, 2012 10:06 am
Forum: Megadrive/Genesis
Topic: M68000 Microcode-level emulation
Replies: 18
Views: 48775

Hi,
I have just come across your post.
I have also been working on this for a while - my interest is improving the VHDL softcores we use. www.fpgaaracde.com
I have also been looking at the die scans.

There is a book called
P._Antognetti,_F._Anceau_and_J._Vuillemin__Microarchitecture_of_VLSI ...
by mikej
Fri Dec 14, 2012 9:51 am
Forum: Megadrive/Genesis
Topic: FPGA Genesis with Sound
Replies: 48
Views: 44632

Hi,

I designed the fpgaarcade replay board and have been looking at porting this to the board (based on a Spartan3 1600e) . I am happy to help out!

www.fpgaarcade.com

Best,
/Mike

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