Hi all,
how we can adjust the driver strength of the I/O's for the eMMC (eSDHC) controller? We are working on a coustomer LS1021A design, with really short traces between eMMC and processor. We could observ overshoot at the CMD line which are out of operation range.
We realy appreciate your response.
Best regards and thank you in advance,
Christian
已解决! 转到解答。
The fact that you are observing overshot means output driver strength needs to be reduced - output driver impedance is to low and needs to be increased.
The typical way to increase output driver impedance is to place series resistor at the near (source) end of trace.
Output driving strength on eSDHC signals can not be changed by software.
Have a great day,
Alexander
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The fact that you are observing overshot means output driver strength needs to be reduced - output driver impedance is to low and needs to be increased.
The typical way to increase output driver impedance is to place series resistor at the near (source) end of trace.
Output driving strength on eSDHC signals can not be changed by software.
Have a great day,
Alexander
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
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