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AHB acceses to port B on TM4C123GH6PM generating bus fault exception

Hi,

I am trying to write to port B using its AHB address 0x400593FC and execution terminates with bus fault. Alternate access through APB at 0x400053FC is normal however.

Mt queries are:

1) Are any settings required to access a peripheral through AHB? (I am using TI-RTOS does that block AHB accesses?)

2) Is  any header file provided by TI that maps the port A-F bits' to their bit band addresses?

 

Regards