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TMS570LC4357: EMIF扩展多个存储器时片选引脚的疑问

Part Number: TMS570LC4357


我使用TMS570LC4357的EMIF模块扩展3路存储器,其中CS[0]扩展SDRAM,CS[2]扩展NOR FLASH,CS[3]扩展FPGA

我的疑问是,在访问某个扩展存储器时,是否需要将对应的CS引脚拉低,其他CS拉高?还是说软件不需要关心片选,只要我访问对应片选的地址,芯片就自动完成片选信号的拉高拉低?