[SI-LIST] Re: How many simulated bits are confident using HSPICE generating eyediagram.
- From: Hermann Ruckerbauer <hermann.ruckerbauer@xxxxxxxxxxxxx>
- To: Knikro <knikro@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 07 Jul 2011 13:06:04 +0200
Hello Khaled,
sorry for the delay .. I was on businesstrip, so I could not respond.
Here a link to one paper ..
http://cp.literature.agilent.com/litweb/pdf/5990-4783EN.pdf
Hermann
EKH - EyeKnowHow
Hermann Ruckerbauer
www.EyeKnowHow.de
Hermann.Ruckerbauer@xxxxxxxxxxxxx
Veilchenstrasse 1
94554 Moos
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schrieb Knikro:
> Hi Hermann,
>
> Great response.
>
> Can you please point me to the papers describing the technique of determining
> the PRBS level based on impulse response settling?
>
> I have been searching IEEE explore with no luck so far.
>
> Many thanks!
>
> Khaled
>
> On Jul 4, 2011, at 3:32 AM, Hermann Ruckerbauer
> <hermann.ruckerbauer@xxxxxxxxxxxxx> wrote:
>
>> Hi Tesla,
>>
>> Steve already mentioned most of my thoughts:
>>
>> What I usually do is to simulate a step response and take a look how
>> long it takes until the signal has setteled. Based on this you can
>> select which PRBS length you need to take in order to capture the worst
>> case ISI (there are some papers out describing this approach).
>>
>> On the X-talk there is the brute force method as Steve describes, but as
>> this is very time consuming (especially when having more aggressors). I
>> use a different method that is not that accurate, but captures most of
>> X-talk effects while minimizing runtime:
>> Take the PRBS pattern that you run on the Victim and run the same
>> pattern on all agressors (even X-talk) in the second step (same
>> simulation) take the PRBS pattern from the Victim and run an inverted
>> pattern on all Aggressors. This approach might not capture the worst
>> case X-talk, but limits the simulation time to running the PRBS sequence
>> two times at a reasonable accuracy.
>>
>> The better option might be to use a statistical approach for your
>> simulation (not sure if HSPICE includes such thing in the meantime).
>> Simulate a stepresponse to characterize the Channel (or use
>> S-Parameters), and based on frequency domain characteristics a dataeye
>> (including X-talk) can be calculated. There are many simulators out that
>> can do such stuff in the meantime ...
>>
>> Best regards
>>
>> Hermann
>>
>> EKH - EyeKnowHow
>> Hermann Ruckerbauer
>> www.EyeKnowHow.de
>> Hermann.Ruckerbauer@xxxxxxxxxxxxx
>> Veilchenstrasse 1
>> 94554 Moos
>> Tel.: +49 (0)9938 / 902 083
>> Mobile: +49 (0)176 / 787 787 77
>> Fax: +49 (0)3212 / 121 9008
>>
>>
>> schrieb steve weir:
>>> The answer depends on what you want to know.
>>>
>>> If you want to capture your basic channel characteristics under the
>>> intended encoding scheme, then figure out your maximum run length and
>>> pick a PRBS sequence that is long enough to capture that run length and
>>> simulate the entire sequence.
>>>
>>> If you are trying to do something like evaluation of crosstalk on the
>>> eye, then brute force starts to get expensive in simulation time. The
>>> brute force method is to use a different PRBS on each aggressor than the
>>> victim, and then run the product of the two sequence lengths.
>>>
>>> Steve.
>>> On 7/4/2011 12:42 AM, Tesla wrote:
>>>> Hi All,
>>>> I will simulate a Multi-Gigabit Serial Link(10Gbps) using HSPICE. I
>>>> want to generating eye diagram as the final result, But i don't know how
>>>> many bits to run ? Can someone give me some hints?
>>>> Best Regards.
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