DSR eMMC

christiansielaf — Mon, 09 Jan 2017 09:15:56 GMT

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

Re: DSR eMMC

alexander_yakov — Mon, 09 Jan 2017 12:56:57 GMT

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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DSR eMMC

Re: DSR eMMC