The Freescale MPC5554 is an PowerPC process with a e200Z6 core. 
The difference between this and the MPC551xsim is that this supports VLE.
	
Datasheets:
  
Info:	
  MPC5554
  2MB Flash
  64KB SRAM
  .. 
  
Memory Map:
 0x0000_0000 ->           Flash
 0x4000_0000 ->           SRAM