[Coco] FPGA 63x09
deek at d2dc.net
Fri Mar 27 11:47:21 EDT 2009
jdaggett at gate.net wrote:
> That has been looked into.
> There are a few issues yet to be resolved, one being my time primarily. Fortunately the busy
> season of my line work is almost over and I should get more time to devote around the
> middle of May. Of the other issues are which FPGA, which development board and which
> design to modify or start from scratch.
> In the case of which design to use:
> There are four approaches that one can take
> 1) Modify John Kent's 6809 IP code .
> 2) Modify one of two 68HC11 IP codes
> 3) start from scratch
> 4) start with Fint Wheeler's code and modify it.
> I started with approach #3 until I closely looked at the freely available code from Green
> Mountain on their version of the 68HC11. I lean to the GM HC11 modification as I am a
> hardware engineer as opposed to software engineers. My HDL coding style lends more to
> me thinking in terms of hardware rather that more abstract levels. So for some my HDL
> coding style may very well be primitive. I personally don't care as it is easier for me to
> comprehend what is going on. I do not like long( ten and fifteen page) processes or entities.
> To me it is easier to break them up into smaller sections if need be. The GM HC11 is rather
> easy for me to read and maybe off an easier route to mdoify. The HC11 archetecture is not
> all the dissimilar to the 6809 since both are offshoots of the 6800.
When I checked last week, it wasn't allowed for you to distribute a modified
version of the Green Mountain HC11 core.
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