>Wolfram Liebchen wrote:
>>
>> Thomas Coonan wrote:
>> > What I have is meant to be synthesizable core and not timing-accurate
>> > bus model.  However, you might find my 16C5X VHDL core otherwise
>> > helpful.  It's on the net on my page.
>>
>> A question, I am interested in:
>>
>> What about Microchip's copyright of the PIC architecture,
>> instruction set, etc.?
>>
>
>I don't think you can copyright a architecture or a instructions set.
>If you could, Intel would have a clear case to take court against
>all thoose x86 cloners instead of sueing them over microcode licenses or
>bus patents.
It's interesting to read about "Clean Room" doctrines at places like
Chips and Technologies, or AMD, where they can prove and document that
they have hired no former Intel chip designers, etc.  They strictly
control what intellectual property is used.  Using a Data Book is fair
game..