[rescue] A5000 questions...

H.H. justaguy at lanset.com
Wed Aug 6 22:15:58 CDT 2003

errrrrrr....... isn't that 64 bits wide (8 bytes)?

>   Uhhhhhhhhh, NO.  Sbus is usually clocked at 25MHz and it's four 
> bytes wide, making it about the equivalent in performance to baseline 
> PCI.  The faster (33MHz) baseline PCI clock advantage is eaten up by 
> the way sbus starts and stops transfers...with sbus, one transfer can 
> start on the very next cycle after the last transfer ends, but with 
> PCI there are intervening arbitration cycles.

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