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TMS320C6678: Spi片选应用问题

Part Number: TMS320C6678


自己设计的板卡上使用了spi接口的cs0,cs1接口,相当于使用了spi的5线模式,且两个片选借的都是nor-flash(N25Q128),cs0片选读flash的ID正确且正常读写数据, cs1片选读flashID都是0XFF,不正确,请问,我应该如何去配置程序和硬件呢