function confilict

[wanglee]

Q：How to end this confilict?

[Yuri]

Hello,

   The Boot  Configuration Select with resistors just provides 4.7 kΩ pullup, when

the switch is ON. Basically this should not affect EIM signals, if outputs are strong

enough to overdrive 4.7 kΩ.

Have a great day,
Yuri

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[wanglee]

how to make it strong enough?

[Yuri]

Hello,

The following app note helps to setup pin’s electrical properties. 

“Influence of Pin Setting on System Function and Performance”

< http://www.nxp.com/files/32bit/doc/app_note/AN5078.pdf >

Regards,

Yuri.

[wanglee · Accepted solution]

  I replaced 4.7kΩ with 18kΩ, the wave form changed. I think the problem is drive strength of EIM signals.so I reconfigured the DSE(drive strength field),but it didn't work. Can you give me some advice?