Why does it seem that every post that I make to the list has to have at least one numerical error in it? My message should have read: A SCENIX chip at 50 MHz has *10* times the speed of a 20MHz PIC. Sean >Date: Mon, 23 Aug 1999 10:28:55 -0400 >To: pic microcontroller discussion list >From: "Sean H. Breheny" >Subject: Re: RC5 on a PIC? >In-Reply-To: <199908231022.NAA14214@sekunda.pp.utu.fi> > >What about using a SCENIX chip instead? A SCENIX chip at 50 MHz has 5 times the speed of a 20MHz PIC. Since this is just number crunching, no peripherals are needed and there is no trade-off. > >Sean > >At 01:22 PM 8/23/99 +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. >> | | Sean Breheny | Amateur Radio Callsign: KA3YXM | Electrical Engineering Student \--------------=---------------- Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 mailto:shb7@cornell.edu ICQ #: 3329174 ________________________________________________________ NetZero - We believe in a FREE Internet. Shouldn't you? Get your FREE Internet Access and Email at http://www.netzero.net/download/index.html