BE on ColdFire

I solved BE problem in hardware.
I am using ColdFire MCF5307 with software running from 16bit ram chip
with 2 byte enable pins, CS1 is used
in start.f file I have BE enabled ( CSCR1 set to 1DF8)
but I never got ColdFire to start properly - transfer from rom to ram
was getting stack
I solved the problem in hardware:
- BE lines from ColdFire to ram chip go via AND gates
- I control these gates in such a way that ColdFire reset ( pin 67)
  sets both outputs L allowing proper start up ( rom -> ram transfer 16bits)
- as soon as my software starts I set AND inputs H allowing BE0 BE1
  from ColdFire through
This way I have all accesses working properly ( both write & read)
C! C@ - 8 bits
W! W@ - 16 bits
 ! @ - 32 bits

Regards

Jacek

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Received on Thu Dec 16 2004 - 13:43:53 PST