STDM & PCI

algorhythm · Post by **algorhythm** » Wed Jul 10, 2002 9:39 am

Tech Question for the Super Geeks:

In a multiple-card setup, do all cards use the PCI bus bandwidth, or does only Board 0 utilize the PCI bus and Board 1 communicate internally with board 0 via the STDM bus? Or do all boards use the PCI bus?

thx in advance

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.:algorhythm:. shouldn't you be making music or something?

[ This Message was edited by: algorhythm on 2002-07-10 10:40 ]

jupiter8 · Post by **jupiter8** » Wed Jul 10, 2002 10:20 am

The "first" card handles all PCI communication.
The rest communicate via the STDM bus.

kimgr · Post by **kimgr** » Wed Jul 10, 2002 5:22 pm

Algorhythm did ask for a "SuperGeek" answer, so:
All the audio data travels thru the S-TDM buss, from card to card, and via board0 PCI to and from the host system.
Other data, such as downloading of dspcode to the chips and certain control and status messages still goes thru the PCIbus of the induvidual cards.

Kim.
(Maybe not super, but a geek for shure)

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Design & Media
http://www.d-media.dk

[ This Message was edited by: kimgr on 2002-07-10 18:23 ]

algorhythm · Post by **algorhythm** » Wed Jul 10, 2002 8:24 pm

thank you both - that is what I had hoped and expected to hear.

Rob van Berkel · Post by **Rob van Berkel** » Thu Jul 11, 2002 9:10 am

A thing to consider (as I did recently):
When adding a scope SRB (15dsp) card to a pulsar2 setup, move the io-plate from the pulsar to the scope, make the scope board0, thus making it the PCI-master, and 'degrade' your pulsar2 to a srb. This way the card that will probably account for the biggest data-traffic (because most processing is done here) has become pci-busmaster.
Just an idea.
Rob

at0m · Post by **at0m** » Fri Jul 12, 2002 12:00 am

Robert, that's exactly what I did

Works great. Only 14 DSP are left though, one is now assigned for I/O management. Could anyone who's using Scope SRB w/o I/O board check his DSP load? The total number will include the 15 DSP's, but how about the detailed view below? I see only 14, with the I/O board on the SRB. Maybe we loose one DSP for the I/O management now, I don't know, so maybe we better keep the I/O's on Pulsar2 or something? Could someone verify?

[ This Message was edited by: at0mic on 2003-10-29 09:48 ]

kimgr · Post by **kimgr** » Fri Jul 12, 2002 11:32 am

AFAIK all Scope boards use one chip for "the system".

Kim.

at0m · Post by **at0m** » Thu Aug 01, 2002 6:35 am

You're right, I just swapped I/O board back to PulsarII to make sure, and in DSP load only 14 DSP show for the Scope SRB. So I'll put the IO board back on Scope I guess...

[edit] Won't swap IO's no more, unless I'm experiencing problems. No more 'fix it till it's broken'

[ This Message was edited by: at0mic on 2002-08-03 16:51 ]

Rob van Berkel · Post by **Rob van Berkel** » Fri Aug 02, 2002 6:25 am

happy swapping