[SI-LIST] Re: Temperature Problem

  • From: "saprasad" <prasadsa@xxxxxxxxxx>
  • To: <si-list@xxxxxxxxxxxxx>
  • Date: Wed, 29 Sep 2004 11:06:11 +0530

Thanks for the information, i am working on some of your pointers.

Regards,
S A Prasad
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----- Original Message -----
From: "steve weir" <weirsp@xxxxxxxxxx>
To: <prasadsa@xxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, September 28, 2004 8:39 PM
Subject: Re: [SI-LIST] Temperature Problem


> Prasad, what do you timing models say your margin is at these
temperatures?
>
> Steve
> At 07:01 PM 9/28/2004 +0530, saprasad wrote:
> >Hi All,
> >Here is the details of problem we are facing:
> >
> >We have developed the GP7000 Main Board V1.0 which is running at 258 MHz,
> >while the version 1.2 developed at production site is running at 250 MHz
> >at normal temperature.
> >
> >Client is testing the board at 65 deg chamber temperature. At this
> >temperature the board stops working because the temperature at CPU will
be
> >near to 70 deg. Please note that the CPU and Memory are commercial grade.
> >As per client's past experience, other products are running above 70 deg
> >temp at 200 MHz.
> >
> >Is it possible to know what will happen to the CPU-Memory interface
> >running at 250MHz at 70 deg ?
> >The failure is due to component operating temperature range or due to
some
> >synchronization loss between Memory and CPU?
> >What will be the behavior (impedance, rise time, fall time effect) of
> >tracks at 70 deg ?
> >
> >We have track length of 4 inch between CPU(S3C2410) and
> >Memory(HY57V561620B). Whether this is playing any role at higher
temperature?
> >
> >Please advise us if you have any suggestions to sort out this problem.
> >
> >Regards,
> >Prasad
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