[rescue] A5000 questions...

Curtis H. Wilbar Jr. rescue at hawkmountain.net
Wed Aug 6 22:44:15 CDT 2003

I seem to remember than may cards are 32 bit... although I think sbus has
provision for 64 bit.... or at least I remember hearing something to
that effect....

Anyone know anything further on this topic ?

-- Curt

>Date: Wed, 06 Aug 2003 20:15:58 -0700
>From: "H.H." <justaguy at lanset.com>
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>To: The Rescue List <rescue at sunhelp.org>
>Subject: Re: [rescue] A5000 questions...
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>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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Curtis Wilbar
Hawk Mountain Networks
rescue at hawkmountain.net

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