BRx/ORx

We are adding a 2MBx32 external flash to an MPC563 and would like it to
begin immediately after the internal flash, at 0x0008 0000.  The (high
16-bits) of BRx.BA would be 0x0008, but ORx.AM has caused confusion.

 

Do we consider the base address?  Then the address range of 0x0008 0000
to 0x0027 FFFF will need a mask of (high 16-bits) 0xFFC0, so active
addresses would actually be 0x0000 0000 to 0x003F FFFF.  (But addresses
with internal "stuff" will still go internal, yes?)

 

Or are we masking the address space of the part, 0x0000 0000 to 0x001F
FFFF, making the mask (high 16-bits) 0xFFE0?

 

Thanks,

Steve

 



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