SD Card not working on Custom board

[shrutishrivastava]

Hi,

PFA SD card schematics of our hardware. Pls have a look and provide feedback. our observations are as follows:

1. R352 and R1071 are mounted, R 1072 and Q24 are not mounted - SDHC1_CD_B signal is low when card is inserted.

2. DAT0, DAT1, DAT2, DAT3 and CMD lines are pulled up with 10K resistors to P3V3 from Resistors R346, R347,R348, R351, R354 through jumper wires.

3. All the data lines and CMD line is continuously high to 3.3V from the power-up of the board.

4. There is clock available on CLK pin of SD card connector.

Issue: There should be some toggling waveform at DAT0 pin after the Power-on to show the transaction of data but this is not happening. 

Kindly help to resolve the issue at the earliest.

Thanks,

Shruti

[yipingwang]

Last time we discussed there were pull ups inside the voltage translator and on board translators were to be removed and voltage levels to be measured at both ends.

Please note that this issue on LX2160A

[yipingwang]

Discussing with the AE team.