MPC555 Temperature Sensitivity?

Hello All,

I asked a question recently about problems we're having, and I have
more information. We have two different MPC555 part numbers:

MPC555LFMZP40   (-40 to +125)
MPC555LFCZP40   (-40 to +85)

Both of these are "K3" parts (IMMR = 0x3032).

The problem we're having is that our boards with M parts are getting
Machine Check Exceptions when our enclosure gets warm, but we're
talking about 50-55C, nowhere near the ratings, and it seems to be a
problem on the M parts, which are supposed to tolerate very high
temperatures.

We have programmed the flash in these parts 3 different ways:

1) WindRiver flash driver c1.0e, which uses parallel programming
algorithm 60.
2) P&E flash programmer configured to use algorithm 61.
3) Embedded flash programming algorithm 60 from Motorola GMD 3.03

According to the GMD 3.03 flash driver documentation, algorithms 60
and 61 are okay for K3 processors, so it seems like we are 
programming the flash with the correct algorithm(s).

Can anyone shed any light on temperature sensitivity?

Thanks,

Joe







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