The Basic page consists of configurations such as the number of APB slaves, APB protocol, and timeout value. See This Figure.
In a timeout condition, a counter decrements during an active APB operation. A data acknowledge from the target address space forces the counter to reload. If the APB does not respond and generate apb_ready within the number of clock cycles, AXI generates a ready so that it does not hang.
IMPORTANT: Each slave base address/ high address must be configured in the Slave Addresses page.