Does the logic analyzer allow you to specify the logic family parameters? You might have the wrong setting, for instance PECL loading on a CMOS signal. Orin On Mon, 30 Jul 2007 15:19:39 +0900 "PRAJIT S NAIR" <prajitsnair@xxxxxxxxx> writes: > Dear Anand > It may be happening because of probe loading. Please check your > Probe > Capacitance, Frequency of Operation and also Load impedance. > > > Best Regards > Prajit > > > On 7/30/07, SRINIVASAN ANAND-B06739 <anand.srinivasan@xxxxxxxxxxxxx> > wrote: > > > > Content-Type: text/plain; > > charset="us-ascii" > > Content-Transfer-Encoding: quoted-printable > > Hi All, > > I have a problem. Given below is a topology that i have.=20 > > > > > > > > =20 > > > > =20 > > > > I have a bidirectional bus which connects a FPGA to the CHIP. The > > distance between them is 2 inches. Now to probe this bus, i have > the > > signals coming out to the right at a distance of about 6 inches. > Note > > that i am using active probes to probe this interface and there > are NO > > buffers on the line between the chip and LA probes. Now the > problem is > > that when the LA is plugged in I find that the strength of the > signals > > driven by the chip comes down from 3.3V to 2V. Without the LA > plugged, > > the signal strength remains intact. Could anyone help me in > > understanding this? If a solution is possible to get around this, > it > > will be great. > > > > =20 > > Regards, > > Anand > > > > =20 > > > > =20 > > > > > > > > > > -- Binary/unsupported file stripped by Ecartis -- > > -- Type: image/jpeg > > -- File: Outlook.jpg > > -- Desc: Outlook.jpg > > > > > > ------------------------------------------------------------------ > > 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 > > > > ------------------------------------------------------------------ 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