The MicroBlaze and MicroBlaze™ -V and Arm Cortex A9 and R5 processors use 32-bit logical addresses and can address any memory in the system in the range 0x0 to 0xFFFFFFFF. Reserved memory and I/O memory make up this address range. The Arm Cortex-A53 and Cortex-A72 processor uses 64-bit logical addresses.