[SI-LIST] Re: 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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