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Re: SHL II (Re: [f-cpu] DATE2002, day 1 report)

On Wed, Mar 06, 2002 at 02:32:10AM +0100, Yann Guidon wrote:
> hi !
> Michael Riepe wrote:
> > On Wed, Mar 06, 2002 at 12:49:12AM +0100, Yann Guidon wrote:
> > [...]
> > > PS2: i found a new/better barrel shifter structure
> > > this morning in the metro :-)
> > 
> > Faster? Details?
> :-D what a quick answer !

After all those off-topic discussions, I'm glad to hear something
about f-cpu development again ;)

> btw, i met people from the Hannover university,
> i talked about you with someone :-)

He probably didn't know me, did he?

> For the shifter idea, it is very simple, maybe easier
> to understand than the reversed Omega network.
> I use a more straight-forward (naive ?) way, but the unit is
> split into three : one performs SDUP (so one register operand can
> serve to control the shift amount), the other part is a 2-stage
> 4-mux shift/rotate for doing 8-bit and 16-bit shifts/rotates,
> and the last part is a series of 16-bit (only 16 bits left, 16-bits
> right or no shift) blocks. Because we have still to shift 64-16 bits,
> there are 48/16=3 16-bit shift block layers.

How do you build the bit-shifter - full 16x16 matrix?

> But i'll have to rest a bit before i write
> documentation, code and draw stuffs. be patient, DATE has only begun :-)

Please let me know when you have some code to look at.

 Michael "Tired" Riepe <Michael.Riepe@stud.uni-hannover.de>
 "All I wanna do is have a little fun before I die"
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