[SI-LIST] Re: Please suggest a way to monitor high speed busses

Hi,
   We at TeraCross have monitored a 1Gbps bus using cables:

PCB 1 [Signal Source / Connector]
PCB 2 [Conncetor / Mictor / Connector]
PCB 3 [Connector / Signal Destination]

PCB 2 can be removed (and only a cable remains) after you finish =
debugging

- Shimshon Jacobi

-----Original Message-----
From: Gupta, Anurag x4500 [mailto:agupta@xxxxxxxxxxxxxxxxxxx]
Sent: Thursday, November 28, 2002 01:47
To: 'tom@xxxxxxxxxxxxx'; 'weirsp@xxxxxxxxxx'; 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] Re: Please suggest a way to monitor high speed busses


Hi all,

Tom you are right- by monitoring I mean to connect it to a continuous
decision circuit....

Steve / Tom,
Can you recommend any passive attenuator and logic series you have had =
good
experience with
In similar applications.

Regards,


Anurag Gupta


                -----Original Message-----
                From: "Tom Dagostino" <tom@xxxxxxxxxxxxx>@ROCKWELLCOLLINS=20
                Sent: Wednesday, November 27, 2002 2:49 PM
                To: Gupta, Anurag x4500
                Subject: RE: [SI-LIST] Please suggest a way to monitor high
speed busses

                Input impedance if you mean input R is really not the issue,
you need to
                reduce the amount of input C that the monitor has.  If your
application is
                monitor as in put a scope probe on it and see what is
happening I would
                recommend a FET scope probe, one with less than 1 pF input
C.  If you mean
                by monitoring, connect it continuously to a decision
circuit, then any low C
                logic gate will do the trick.  And yes a low input C
amplifier will work
                also.  The key is low C.

                Tom Dagostino
                Device Modeling Division
                Teraspeed Consulting Group LLC
                2926 SE Yamhill St.
                Portland, OR 97214
                (503) 430-1065
                tom@xxxxxxxxxxxxx
                http://www.teraspeed.com


                -----Original Message-----
                From: si-list-bounce@xxxxxxxxxxxxx
                [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Gupta,
Anurag x4500
                Sent: Wednesday, November 27, 2002 1:40 PM
                To: 'si-list@xxxxxxxxxxxxx'
                Subject: [SI-LIST] Please suggest a way to monitor high
speed busses


                Hi all,

                In a design I am working on - I need to monitor the High
speed PowerPC bus-
                Basically the transaction signals, some address and data.
The basic bus
                speed can be 133Mhz or 166MHz.

                Can you please suggest a way of monitoring the signals (
digital levels are
                ok...) as "non intrusively" as possible- so as not to spoil
the "integrity"
                of the bus.

                I was thinking in terms of some ultra-high input impedance
buffers.....etc-
                however I am open to all suggestions..... even the wildest
:-)

                Thanks

                Anurag Gupta



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