[SI-LIST] Temperature Problem

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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