Rogelio Serrano wrote:
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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