Mailbox features a bi-directional communication channel between two processors. The Mailbox can be connected to the processor either through a PLBv46, AXI4-Lite, AXI4-Stream, or FSL interface. The PLBv46 interface option is available for the MicroBlaze™ processor, PowerPC® processor, or any other PLBv46 master. The AXI4-Lite, AXI4-Stream, and FSL options are available for connection to any IP that supports them, for example MicroBlaze.