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Re: Termination of Bussed signals
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: Termination of Bussed signals
- From: dvideo@ix.netcom.com (Jerry M. Robinson )
- Date: Sat, 3 Aug 1996 19:56:31 -0700
- Resent-Date: Sat, 3 Aug 1996 19:56:31 -0700
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-Id: <"7lQi71.0.F26.b611o"@dart>
- Resent-Sender: pci-sig-request@znyx.com
You wrote:
*
>The CompactPCI spec calls for 10 ohm series termination resistors on all the
>bussed PCI signals. I assume the value of 10 was chosen based on an 8-slot
>CompactPCI backplane.
>
>We are designing a CompactPCI target device that will be in a CompactPCI
>backplane with only two slots. Does this mean we should use another
>value besides 10 ohms? Thanks.
>
-- Are you designing a plug-in-card or motherboard?.... Surely you don't mean
plug-in-card....
Also.... 8 slots and the CPU-PCI interface chips is 9 loads... on a 10 load/33
MHz PCI bus.... You only plan to plug in *one* PCI card or are you perhaps
running at 25 MHz?... Exceeding 10 PCI loads at full speed is a real risk...
and not likely to work reliably. Can you clarify?
Jerry M. Robinson
Jamar Technologies, Inc.
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