You probably heard of the infamous FORTH chips like the Harris RTX2000,
or ShhBoom, which implemented a stack oriented very low power design
before there were FPGAs in silicon. To my knowledge the RTX2000 is still
used for space hardened application and if I search long enough I might
fine the one I had sitting in my cellar.
The chip was at that time so insanely fast that it could produce video
signals with FORTH programs driving the IO pins. Chuck Moore, father of
FORTH developed the chip on silicon in FORTH itself.
Due to the fact, that the instruction sets of a FORTH machine, being a
very general stack based von Neumann system, I believe that starting
with an RTX2000 (which should be available in VHDL) one could quite fast
be at a point where things make sense, meaning not going for the
'fastest' ever CPU but for the advantage of having a decent CPU
programmable in Python sitting on a chip with a lot of hardware available.
Another thing worth to mention in this context is for sure the work
available on http://www.myhdl.org/doku.php.
Werner
On 4/3/11 3:46 AM, Dan Stromberg wrote:
On Sat, Apr 2, 2011 at 5:10 PM, Gregory Ewing
<greg.ew...@canterbury.ac.nz <mailto:greg.ew...@canterbury.ac.nz>> wrote:
Brad wrote:
I've heard of Java CPUs. Has anyone implemented a Python CPU in VHDL
or Verilog?
Not that I know of.
I've had thoughts about designing one, just for the exercise.
It's doubtful whether such a thing would ever be of practical
use. Without as much money as Intel has to throw at CPU
development, it's likely that a Python chip would always be
slower and more expensive than an off-the-shelf CPU running
a tightly-coded interpreter.
It could be fun to speculate on what a Python CPU might
look like, though.
One with the time and inclination could probably do a Python VM in an
FPGA, no?
Though last I heard, FPGA's weren't expected to increase in performance
as fast as general-purpose CPU's.
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