RE: JTAG Signals on PCI Backplanes.

[Garnett Hamilton <ghamilton@CHRYSALIS-ITS.com>]

We have not yet had a chance to investigate the root cause of the
problem, but on the PCI card we are currently developing the JTAG
signals on the backplane had to be disconnected from the JTAG chain on
the card.  Before we made this change, the CPU found something that it
severely didn't like about the JTAG chain and was consuming an abnormal
amount of power.  

Our CPU, which normally runs at a low-moderate temperature, was too hot
to touch.  My calibrated finger estimates 80 C!  The chassis in question
is a garden-variety PC with an Asus motherboard.  In general, I feel
that Asus makes a very good motherboard.  It will be interesting to find
out what the real problem is (if we ever get time).

For what it's worth,

	Garnett
===================Safeguarding the Keys to Electronic Commerce
     Garnett Hamilton             Chrysalis-ITS, Inc.
Manager, Hardware Development     200-380 Hunt Club Rd
Tel.: 613-731-6788 ext 120        Ottawa ON  K1C 1V1
Fax: 613-731-1013                 http://www.chrysalis-its.com
Eml: ghamilton@chrysalis-its.com


> -----Original Message-----
> From:	Richard Rooney [SMTP:richard.rooney@mentec.ie]
> Sent:	Tuesday, 1998 March, 10 7:45 AM
> To:	Mailing List Recipients
> Subject:	JTAG Signals on PCI Backplanes.
> 
> 
> Does anyone know if the JTAG signals on PCI backplanes are actually
> normally connected to anything ?
> Are they even bussed from one slot to another ?
> 
> Regards,
> Richard Rooney,
> Mentec Ltd.,
> Pottery Road,
> Dun Laoghaire,
> Co. Dublin,
> Ireland.
> 
> Tel : +1-2059797
> Fax: +1-2059798
> Email : richard@mentec.ie