Re: Internal flash programming of MPC555

You don't say if your 555 is actually doing anything at all or just 
not reprogramming.

Track length can potentially cause issues with high speed signals 
especially.
Too many devices placing too much load on a single line will screw up 
signals so maybe you need some buffering.
A poorly terminated line could cause reflections.
Presumably if you have many devices sharing a single PORESET they are 
also sharing the same power supply so maybe that's overloaded?
Shorts, Open circuits etc etc
There are many things that could be causing your problem but it would 
be very difficult for anyone to diagnose a problem in a multi-
processor system without seeing it.

I'd go back to the hardware engineers that designed your system and 
ask them if they've considered all these things and get them to stick 
a scope on it :)

--- In [email protected], "Sushmitha" <sushmi_reddy2003@...> 
wrote:
>
> Hi,
> 
> When I program MPC555 board individually , It is booting and 
working 
> properly. But when MPC555 board is integrated with other boards in 
the 
> application, programming of internal flash is not happening.
> 
> Can PORESET may create any issue regarding this? As the same signal 
is 
> used in other boards. The total trace length of PORESET signal 
> navigating is 10 inches when other boards are integrated. Can this 
> show an effect in time delay(fall time) of the poreset signal?
> 
> Or any other options may cause this issue?
> 
> Thanks & Regards 
> Sushmitha
>