[SI-LIST] Re: Are there any ways to use DSO type scopes for eye p attern measure ment?
- From: =?big5?b?Sm9obiBMaW4gKKpMtMK31yk=?= <John@xxxxxxxxxxxx>
- To: slai <slai@xxxxxxxxxx>
- Date: Tue, 13 Nov 2001 16:49:58 +0800
Hi Samuel,
Thank you for your helps.
The signal I measured is a differential type signal, swing from +1 V to -1V
volt. I triggered the signal with edge type .
The scope can catch the signal well without moving and therefore, no eye
pattern shown.
Would you please provide more detail instructions to show the ways of doing?
I appreciate you for helps.
>8-)
John Lin
Senior SI Engineer, Server Team, ARD4
Quanta Computer Inc.,Taiwan, R.O.C.
Email: John@xxxxxxxxxxxx
Tel: 886+3+3272345 ext. 5183
-----Original Message-----
From: slai [mailto:slai@xxxxxxxxxx]
Sent: Tuesday, November 13, 2001 10:36 AM
To: John Lin (ªL´Â·×)
Subject: RE: [SI-LIST] Are there any ways to use DSO type scopes for eye
p attern measure ment?
John,
This is Samuel Lai from Micron Taiwan. The below is the advice from Micron
Boise lab. FYI.
DPO is a Tektronix gimmick that not many people use. We do data and address
eyes all the time with our Agilent Infinium scopes. It can also be done
pretty easy on Tek scopes. Trigger on a setup violation for instance. Or
you can just trigger on a clock and capture all transitions. If you are
looking for a specific command, you might need to qualify with a state.
Then put the display of the signals to infinite persistence or even variable
persistence. The 694 colors all channels to one color, I believe, which
makes it hard to read. The newer scopes put all signals to their own colors
like the Agilent ones. Then you can use the cursors to measure the worst
case setup and holds for both high going and low going patterns.
Also, Infinium has a lot of features like masking that will allow you to
measure an eye, and then turn it into a mask. Then any violations to the
mask are recorded or stopped on.
Let me know if I should send some waveforms or anything. DPO is just DSO
with infinite persistence on.
-jon
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