Re: [f-cpu] Bit Shuffler (Take 2)

[Yann Guidon <whygee@f-cpu.org>]

hi again,

Michael Riepe wrote:
> On Fri, Sep 28, 2001 at 07:34:37PM -0400, nicO wrote:
> [...]
> > Should i suggest to try to make the mul with mul 8*8 entity ? Synplicity
> > use very high level optimising schem (it doesn't try to simplify at the
> > gate level but at the structure level, that's why it's faster and more
> > performant than the other fpga compiler). Our [michael;p] SIMD 64 bits
> > mul should be quicker with basic 8 bits bloc. But this could be only
> > true with fpga.
> 
> The multiplier was fast enough -- more than 100 MHz (in an FPGA) --
> and an 8x8 architecture would need more stages (my first version hat 8x8
> building blocks, and 9 or 10 stages, while the current one has only 6).
> I don't worry about that, but the shifter gives me headaches.

i will let you work in peace with this unit.
i will concentrate on the "control/scheduling" side.
I trust you to do whatever is necessary, even if sdup
must be 2* slower than shl :-)

>  Michael "Tired" Riepe <Michael.Riepe@stud.uni-hannover.de>
WHYGEE
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