[Coco] FPGA 63x09

[jdaggett at gate.net]

jeff

per the lincense agreement that I have is as follows

MODIFICATION. The Source Code may  be modified by Licensee without 
the prior written permission  of Licensor.  Any  modifications made to the
Software will continue  to be subject to  the terms and  conditions of
this License.

Besides the final product will no longer be an HC11 but a 6309. 
Modification is probably not a correct term anyway. Using this design as a 
template would be better.

james

On 27 Mar 2009 at 11:47, Jeff Teunissen wrote:

> jdaggett at gate.net wrote:
> > Stephan 
> > 
> > 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.
> 
> [snip]
> 
> 
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