[SI-LIST] Re: SATA eye diagram - how much is too much
- From: Chris Cheng <Chris.Cheng@xxxxxxxxxxxx>
- To: "'Charles.Grasso@xxxxxxxxxxxx'" <Charles.Grasso@xxxxxxxxxxxx>, "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 5 Oct 2004 10:37:06 -0700
It depends on whether you are trying to qualify an open system or a captive
one.
I deal with FCAL instead of SATA but almost all component vendors will
whisper in your ear that their receiver will work way under the FCAL eye
opening spec. Some of them will work even if the eye is entirely closed. So
when I have to qualify an incoming eye into a PBC in my centerplane from
another on board PBC and it meets the vendors receiver spec, I will ignore
the FCAL eye diagram.
On the other hand, if I have to qualify the output to a HBA where my
customer can plug any FCAL link into it, I better make sure the FCAL eye is
met under any possible combination.
-----Original Message-----
From: Grasso, Charles [mailto:Charles.Grasso@xxxxxxxxxxxx]
Sent: Tuesday, October 05, 2004 7:28 AM
To: 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] SATA eye diagram - how much is too much
Greetings!
I have a question regarding the interpretation of the eye diagram data vis a
vis
SATA.
How many violations of the eye does it take before a design is brought to a
screeching halt? A follow up question:
Can eye violations be graded in terms of severity based on the location
of the violation (that is : at the outer bounds, or the internal eye
trapezoid )?
The basis of this question (naturally) is that I have SATA data that have
exactly
one 1 violation at the outer bound of the eye at 1 minute of data capture.
Typical go/no go specification will determine that to be a fail. I am not so
sure.
Any insight would be greatly appreciated.
Thanks
Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Email: charles.grasso@xxxxxxxxxxxx; <mailto:charles.grasso@xxxxxxxxxxxx; >
Email Alternate: chasgrasso@xxxxxxxx <mailto:chasgrasso@xxxxxxxx>
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