Hi Xiaoling Li
MBIST does exist in some auto chips for example MPC57xx but LPC1778 doesn't integrate MBIST module.
For LPC1778, to test external memory, user needs to write code.
Your can refer external driver code under LPCOpen folder.
LPCOpen Software for LPC17XX | NXP
There is periph_memtest demo code, you can refer it to implement your own testing code.
Have a great day,
Jun Zhang
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