When the 'silicon generated' box is checked. This will make a unique address for each device which can have a maximum combination of 2^24 device address. This generation of address is automatically taken care inside the BLE Stack.
Note: The silicon-generated “Company assigned” option does not guarantee a unique device address. For mass production, Cypress strongly recommends that the device address be programmed into the user’s SFLASH location (row 0 of user SFLASH) via the SWD interface. For more information, please refer to page44 in BLE Component datasheet v3.63.