Hi, I work on ST10F168 and i use external ram by EBC in 16 bits demux mode with keil V2.38 There are 4 Chip Select available for ram : CS1,CS2,CS3,CS4 and 23 adress bits : A1->A23 So, there are (2^23 * 4) bytes accessible <=> 32Mo I would to know if i am right and if i can declare an external memory map of 32 Mo ! Thanks for any suggestions ! Regards, Jim