Allows the core to transfer configuration information with the user application when externally implemented configuration registers are implemented. When you disable the Config Ext Interface option, the following ports are removed from the core:
• cfg_ext_read_received
• cfg_ext_write_received
• cfg_ext_register_number
• cfg_ext_function_number
• cfg_ext_write_data
• cfg_ext_write_byte_enable
• cfg_ext_read_data
• cfg_ext_read_data_valid