At 13:22 23.8.1999 +0300, you wrote:
>I've been toying with the idea of running that popular RC5 key search on a
>PIC. Now, I realize it probably won't be cost effective, because I have
>estimated the performance of it on a PIC - with $1 per a 20 MHz pic, I'd
spend
>more money on just the PICs than buying a complete K6-2 or Celeron system, to
>get equivalent performance.
>
>What really hurts the performance is the 32-bit data, and how to handle it.
>I've managed to do a 32-bit rotate (which can roll the data 0-31 bits left),
>which takes 17-47 instruction cycles (average 35.25), but haven't looked
>further into it. I'd be ecstatic if I managed to get above 5000 keys/second
>from a single PIC, but I have a feeling that it will be difficult if not even
>impossible.
>

What about to use some external PLD chip like Lattice isp1016 for 32bit
rotation ? Put 2 x +υ bits in and than only clock rotation via one pin and
read the data back ?

PavelK

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