if  BSP_USING_EXTMEM
    config EXTSRAM_MAX_NUM
        int
        default 4
        
    config BSP_USING_FSMC_BANK1_NORSRAM3
        bool "config fsmc bank1 sram3"
        default n
        if BSP_USING_FSMC_BANK1_NORSRAM3
            config BANK1_NORSRAM3_SIZE
                hex "config sram3 chip size"
                default 0x100000
            config BANK1_NORSRAM3_DATA_WIDTH
                int "config sram3 chip data width"
                default 16 
        endif
endif