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8148不接DDR颗粒时如何判断系统是否正常?



大家好,我手头有批8148的板子,目前测试发现DDR颗粒焊接有问题,所以我把DDR颗粒拆了,现在 8148的电源、外部晶振始终正常的,请问还能通过测试哪些信号来判断此时的8148可正常,目前板子还有外设如下:

1、SD卡

2、SPI FLASH;

3、NAND FLASH;