Re: [myhdl-list] HDL essays ...ZPU

[Jan C. <jen...@mu...>]

On 20/02/14 11:57, Christopher Felton wrote:
> A weekend project I never finished (long time ago :)
> http://myhdl.org/doku.php/users:cfelton:projects:zpu
Thanks, now I have something to grade my work by!:-)  Sorry, but 
can't remember if I'd seen your ZPU page before, or not.   I might 
yet regret starting on the ZPU last weekend:

I was thinking of combining the slow and fast models, with small 
stack cache & big external memory interface.  By adding a two stage 
instruction decode pipeline it should be possible to consume the 
serial in-line constants faster.  Then, duplicating this cache 
could reduce/remove stalls caused by branch instructions.

However, adding a stack cache might get it so close to one 
instruction per clock cycle that the instruction pipeline will 
never get a chance to run ahead and do it's work.

(I replying, perhaps switch to private email/start new thread?)
> Regards,
> Chris
>
> p.s. how do I down grade my thunderbird, everything is
> broken!
I just made mine promise to send everything in plain text, but time 
will tell...  If it won't then I might be tempted to switch to 
something very simple.  I like the idea of one file per email, as 
this would significantly reduce my PC incremental backup size, but 
the only email tool I've found that does this is really ancient.

Jan Coombs
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