[SI-LIST] Re: Any basic idea about on-chip clock skew detection?
- From: steve weir <weirsp@xxxxxxxxxx>
- To: cyr_1976@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 18 Oct 2004 10:26:41 -0700
Yiran, there are methods to statistically grade the skew, but I don't know
how useful that would actually be to you. Essentially, you build a local
delay line(s) from logic and run a metastable event capture / counter
circuit(s). The problem is one of calibrating the unit delays without
gobbling up lots and lots of logic, and/or eating up a DLL or PLL. For
circuit details, just search "metastable" in Google.
Maybe someone else knows of a way to get around the driver delays and
packaging effects, but if you go off-chip by conventional means, the skew
you measure will be buried by other effects.
Assuming that your foundry has characterized their process well, I think
you will get the most accurate results for process corners from your tools.
Steve.
At 03:29 PM 10/18/2004 +0000, Yiran Chen wrote:
>Hi, guys
>
>Do you know how to measure two clock signal's skew by using some on-
>chip method? Such as circuit and so on? If not, how could we do it
>offchip? need two pin and two same-length wires or...?
>
>Many thanks.
>
>Yiran
>
>
>
>------------------------------------------------------------------
>To unsubscribe from si-list:
>si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
>or to administer your membership from a web page, go to:
>//www.freelists.org/webpage/si-list
>
>For help:
>si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>List FAQ wiki page is located at:
> http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
>List technical documents are available at:
> http://www.si-list.org
>
>List archives are viewable at:
> //www.freelists.org/archives/si-list
>or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
>Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
