[SI-LIST] Re: Please suggest a way to monitor high speed busses
- From: "Shimshon Jacobi" <jacobi@xxxxxxxxxxxxx>
- To: <agupta@xxxxxxxxxxxxxxxxxxx>, <tom@xxxxxxxxxxxxx>,<weirsp@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 28 Nov 2002 09:29:51 +0200
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
=09
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