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RE: motherboard target burst size
Dave Matthews wrote:
>I am designing an expansion card which will be attempting to perform
>large bursts to memory on the motherboard. I am trying to get a feel
>for the bandwidth that I can achieve doing this. I am not so much
>worried about other requesters on the bus, but the maximum burst size
>that the chipset can accomodate before deasserting TRDY. Does anyone
>have a feel for this for various motherboards?
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
The AlphaServer 4100 supports bursts up to 8KB on two peer 64 bit PCI
buses. Using large bursts will increase PCI utilization and delivered
bandwidth. We've seen 256B bursts on PCI storage adapters; larger for
PCI NVRAM (the NVRAM card limited bandwidth with IRDY# stalls).
For more information on the AlphaServers, see :
www.digital.com:80/.i/info/alphaserver/
or for the AlphaServer 4100, see:
www.digital.com:80/.i/info/alphaserver/alphasrv4100/alphasrv4100_abstract.ht
ml
/Sam
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Samuel H. Duncan duncan@poboxa.enet.dec.com
Digital Equipment Corporation s.duncan@ieee.org
129 Parker Street, PK03-1/R11 508-493-6794
Maynard, MA 01754 508-493-4461 (FAX)
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