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Question, i.MX6Solo USDHC#3 / SDR50 or SDR104

Question asked by AVNET JAPAN FAE (team share account) on May 29, 2016
Latest reply on Jun 3, 2016 by AVNET JAPAN FAE (team share account)

Dear team,


I would like to ask about the setting for USDHC#3 of i.MX6SOLO.

My customer is trying to use USDHC#3 of i.MX6SOLO with SDR50 or SDR104 on Linux.

On their board, the power switching circuitry for SD-Card is designed based on your SABRE-AI board.

Now SD3_VSELECT cannot become HIGH on their board. And they saw the VSELCT can be controlled when they removed 4.7K ohm pull-down register from VSELECT line.

They think 4.7K ohm pull-down register is needed similarly to SABRE AI board.

Do you have any ideas for the cause of this phenomenon?