[SI-LIST] Re: PCI Express CLB compliance waveform
- From: "Joel Brown" <joel@xxxxxxxxxx>
- To: "'David Palmer'" <dpalmer@xxxxxxxxxxxxx>, "'Peter zhu'" <yonghui.sky@xxxxxxxxx>
- Date: Tue, 10 Feb 2009 12:24:56 -0800
What I found out is the Intel 965 chipset we are using not PCIe compliant
according to Intel. Also it does not generate the compliance waveform as it
should. I also found that when I tested the 945 chipset it did generate the
proper waveform, but it also was not compliant because the signal level was
too high causing eye diagram violations. One might expect better from Intel.
Joel
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of David Palmer
Sent: Tuesday, February 10, 2009 11:40 AM
To: Peter zhu
Cc: Joel Brown; SI-List
Subject: [SI-LIST] Re: PCI Express CLB compliance waveform
Is channel 1 terminated?
Peter zhu wrote:
> Not sure what your generating compliance test waveform means. PCI-E eye
> diagram compliance test can be done when PCI-E device is in working, and
no
> special compliance test waveform needed.
> PCI-E device has negotiation process during hardware connection, if
> connection can not be setup, the negotiation process will continue, so the
> negotiation waveform will interrupt for a while every several seconds. it
> may lead to fail to generate eye-diagram.
> But If your PCI-E device can work in your system, it means hardware
> connection is successful, you can do compliance test. If you still can not
> got a valid eye-diagram, please check your scope set up, such as, if
> Recovery Clock for Data selected, and appropriate PLL algorithm setup,
etc.
> Peter zhu
> Emerson Network Power
>
>
>
> On Sat, Jan 31, 2009 at 3:58 AM, Joel Brown <joel@xxxxxxxxxx> wrote:
>
>> I have a PCI Express CLB plugged into the PEG slot on my system.
>> My understanding is that when this board is installed it is supposed to
>> invoke the system to generate a compliance test waveform.
>>
>> I am not sure what this waveform is supposed to look like but I don't
think
>> what I am getting is the right one because I am not getting a valid eye
>> diagram on the scope.
>>
>> The system has Intel 965 chipset. Is there anything special I have to do
to
>> invoke the system to generate the proper waveform?
>>
>>
>>
>> Thanks - Joel
>>
>>
>>
>>
>>
>>
>>
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>
>
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--
David Palmer
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cell: 760-791-0061
The editors authors the newspaper liked hired quit.
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