This attribute supports multiple region interfaces. It uniquely identifies a region.
The method set_region() sets this attribute to the value passed as argument. The method get_region() returns the value of this attribute.
The default value of this attribute is 0.
This attribute is specific to the AXI4 and ACE buses. It is ignored for transactions modeling transfers on the AXI3, AHB and APB buses.
For AXI4 and ACE the value of this indicator attribute must be between 0 and 15 inclusive.