[SI-LIST] Re: Flight time compensation
- From: "Todd Westerhoff" <twesterh@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 18 Oct 2007 14:56:44 -0400
Bill,
One point worthy of note - properly measuring a flight time for use in timing
analysis requires
accounting for both the driver's reference load **AND** measuring input
crossings at the receiver in
accordance with the receiving device's setup and hold specifications. The
flight time adjustment
you're talking about here only goes to driver reference load compensation,
which is usually the
easier of the two problems.
My $0.02.
Todd.
Todd Westerhoff
VP, Software Products
SiSoft
6 Clock Tower Place, Suite 250
Maynard, MA 01754
(978) 461-0449 x24
twesterh@xxxxxxxxxx
www.sisoft.com
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Hargin, Bill
Sent: Thursday, October 18, 2007 12:38 PM
To: kpsubramani@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Flight time compensation
Hi Subramanyi:
In the HyperLynx Help system (I'm looking at HL7.7) under "Simulating
Entire Boards or Multiple Nets > Reference Information for Batch
Simulation > Flight-Time Compensation," you'll find a pretty extensive
description on this subject. (Or, just search on "Flight-Time
Compensation.")
Compensation for loading effects is accounted for in an automated
measurement (Flight Time button at the bottom of the scope in 7.7), and
in batch mode, as long as the IBIS models have all of the proper Cref,
Rref, Vref, and Vmeas parameters. (Fortunately, most models do.)
> Can I use batch simualtion to simulate bunch of addr/data lines
There's a spreadsheet output from batch simulation that includes flight
times.
Bill Hargin
High-Speed Marketing Manager
Mentor Graphics Corp.
Systems Design Division
425-301-4425 - Mobile=20
=20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=20
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of sub mani
> Sent: Wednesday, October 17, 2007 5:36 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Flight time compensation
>=20
> Hello all,
>=20
> I have a SDRAM connected to a controller. The SDRAM operates=20
> at 133MHz.=20
> I am using hyperlynx for analysis.
>=20
> I am also using timing designer to check the setup and hold=20
> time margin From Hyperlynx I want to derive the delays due to=20
> transmission line and apply those delays to timing designer I=20
> wanted to know the procedure for doing that. Should I=20
> compensate for the flight time and what are all the data that=20
> I should use from hyperlynx simulation to add to the signal=20
> delay in timing designer to accurately calculate the time=20
> margin Can I use batch simualtion to simulate bunch of addr/data lines
>=20
> thanks in advance
> subramani
>=20
>=20
>=20
>=20
>=20
>=20
> ___________________________________________________________
> Yahoo! Answers - Got a question? Someone out there knows the=20
> answer. Try it now.
> http://uk.answers.yahoo.com/
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>=20
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>=20
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>=20
>=20
> List technical documents are available at:
> http://www.si-list.net
>=20
> List archives are viewable at: =20
> //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
> =20
>=20
>=20
------------------------------------------------------------------
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 technical documents are available at:
http://www.si-list.net
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 technical documents are available at:
http://www.si-list.net
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:
