[SI-LIST] Re: FW: how to connect logic analyzer probes to PCI bus (66 MHz)
- From: "Zelno, John" <john.zelno@xxxxxxxxxx>
- To: "'Jeremy.Webb@xxxxxxxxx'" <Jeremy.Webb@xxxxxxxxx>,"'Signal Integrity list (E-mail)'" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 14 Apr 2004 10:26:30 -0700
You may also want to look at PCI bus analyzers/exercisers, such as those
from catalyst enterprises (www.catalyst-ent.com). These can be a great help
in debugging PCI specific problems, without having to set up complex logic
analyzer triggers. They can also be an agent on the bus that can exercise
the bus with traffic and/or error conditions. If you're tight on real
estate, you can consider one of the smaller form factors, such as PMC.
If you're intent on using a logic analyzer, I would recommend the 100 pin
adapter over the Mictors. Agilent has some notes on this in the document
linked by Jeremy below starting at page 23. In fact, this document states
"Agilent recommends
the E5394A or E5385A [the E5385A is the 100 pin adapter] for new
applications, due to the reduced input capacitive loading and improved
isolation between adjacent channels" on page 24.
-John Zelno
-----Original Message-----
From: Webb, Jeremy [mailto:Jeremy.Webb@xxxxxxxxx]
Sent: Wednesday, April 14, 2004 8:53 AM
To: 'Signal Integrity list (E-mail)'
Subject: [SI-LIST] FW: how to connect logic analyzer probes to PCI bus
(66 MHz)
-----Original Message-----
From: Webb, Jeremy
Sent: Wednesday, April 14, 2004 8:42 AM
To: 'kobik@xxxxxxxxxxx'
Subject: RE: [SI-LIST] how to connect logic analyzer probes to PCI bus
(66MHz)
Kobi,
It depends on whether or not your logic analyzer probe has isolation
networks in it. I recently designed a logic analyzer pod board with the
isolation networks on it. I put Mictor connectors on it, and then placed a
Mictor connector on my DUT board. This way I didn't have to have
the isolation networks permanently loaded on my board. Take a look at the
following data sheet from Agilent regarding "Tip Isolation
Networks" (page 12):
http://cp.literature.agilent.com/litweb/pdf/5968-4632E.pdf
The "Tip Isolation Networks" reside in the flying lead probes that come with
the Agilent logic analyzers. It's basically a parallel RC in series with
an R.
For my tests this worked fine, and made hooking up the logic analyzer much
easier than fumbling around with flying leads.
Hope this helps,
Jeremy
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On
Behalf Of Kobi Kivity
Sent: Wednesday, April 14, 2004 12:39 AM
Subject: [SI-LIST] how to connect logic analyzer probes to PCI bus (66MHz)
Hi all,
i want to add to the PCI bus (66MHz) on my motherboard
connectors (Mictor) to logic analyzer for debug.
questions :
1. where to place the connectors
2. maximum stub length
3. do i need to add termination to the logic probe
my configuration
PCI device 1 PCI device 2 host bridge
! ! !
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