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How to even start routing this?

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Joanna_H:
You know the world has become a little scary when you can fit the majority of an old school 16bit processor into about 2% of a low spec FGPA.......

LCMXO2-640UHC-4TG144C. had to choose the 640 as the lower one doesn't have enough I/O pins :/



I'll post no more on this in this thread as I've gone way of topic now.

SiliconWizard:

--- Quote from: Joanna_H on August 06, 2019, 05:44:51 pm ---You know the world has become a little scary when you can fit the majority of an old school 16bit processor into about 2% of a low spec FGPA.......

--- End quote ---

Not surprised. ;D

You did that pretty fast!

PlainName:
Just like to say that a good habit to develop is to keep pin1 in the same orientation for all chips. Sometimes it's not practical but in that case keeping complete groups the same is a reasonable fallback. Similarly, diodes all point the same way (for those all pointing up/down or left/right). The reasoning is to prevent assembly cockups.

Joanna_H:
Woops, just noticed I was up all night messing with this.. LOL

Still, have some things now working.

A simple test of a NOP, JMP (in page, LSB only) and LJMP (anywhere in memory, uses both MSB and LSB) was fun.  But starting to eat up those resources as I add more stuff :D

At least the microcode isn't on the FPGA, seperate EEPROM to allow for easy program/reprogram of that little part.  Both memory and eeprom simulated in the testing to see how it's going :D


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