Rogelio Serrano wrote:
quoted text
> Im sorry i was meaning to say crossbar switch. I was thinking more
> along the lines of an alternative pc architecture. I was reading a few
> weeks ago about macintosh design stories and i was suprised by how
> simple the designs of the early macs were and was even more surprised
> why it was so expensive. I thought maybe the same design principles
> and design tradeoffs could be applied to current technology.
> 
> Instead of a bus there could be a crossbar switch.Maybe 4 or more ddr
> sockets, 2 processor sockets of some sort, low speed serial bus like
> ADB, a graphics card, an ethernet and a few high speed busses like
> serial scsi connected to it. Maybe it can fit all fit in a few fpga's
> or cpld's.


I don't disgree...   but AFAICS a crossbar switch is largely an 
implementation detail dictated by the functional units you put into your 
system.  Check out the Wishbone stuff at opencores.org.

If you are designing the entire solution, you are certainly free to 
choose your own bus technology and topology.  Most system-on-a-chip 
(SoC) solutions I've seen have an internal bus, and then one or more 
standard external buses for PCI, AGP, DRAM, etc.

	Jeff


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