[SI-LIST] Re: [Fwd: SATA I eye diagram]

Which simulator are you using? If Hspice or other
SPICE-like simulator, it seems likely to me that the
problem is simply an artifact of numerical transients
in the simulation results. When I create such eye
diagrams, I "throw away" the first several bit times
for just that reason.

Kim Helliwell

On Apr 20, 2005, at 5:13 AM, giorgio ravesio wrote:

>
>
> Hi all,
> I am doing some simulation on a SATA I bus, and I have noticed an eye
> diagram violation when the lenght of the differential pair traces 
> reduce
> down to 2 inches.
> The violation is a "glitch" in both the logical level (i.e the logical
> higt state is affected by a  glith who violate the Vih(min) while the
> logical low state is affected by a glitch who violate the Vil(max).
> This strange glitch is approximately  100pS long and occurs
> approximately 2*Tpd from the leading edge, so I am pretty sure it is
> caused by some improper termination.
> What is surprising me, is that this violation occurs only in the first
> bit of the pattern, i.e if I skip the first bit of the pattern
> everything seems OK.
> Could anyone tell me if there is a reason why only the first bit has
> this strange behavior ?
>
> Thanks in advance.
> Giorgio
>
>
> .
>
>
>
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Kim Helliwell
kimgh@xxxxxxx
Homepage: http://homepage.mac.com/kimgh

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