Some SD cards are not recognized.
Removing TXS02612R and connecting it to SD1 Port will work well.
I would like to ask you to check if there is any problem in the circuit
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Thanks for your reply,
I have a misunderstood part by passing a schematic to a picture.
Pdf file will be sent back to the schematic file.
- The part described by pull down resistance of reply contents is varistor (EZJZOV500AA: 3pF).
In addition, when you check the part of the SD below,
As shown in the figure below, the HS SD card works but the UHS SD card does not work.
- As TI replies, remove the external pull up of R56 ~ R60 and remove the varistor of VR415 ~ VR420
The SD card of UHS does not work even when checking.
Please check again.
Thanks for your reply.
First of all, about the inquiry below
1. In case of UHS Card, sd clock frequency is 100Mhz, and the waveform measured by scope will be transmitted.
- Waveform comparison when inserting SD Card (UHS).
2. The distance of the transmission line is shortened to 20mm between the B0 port of TXS02612 and the SD socket,
B1 port is 500mm by shielding cable.
However, the UHS card is not recognized even at the short B0 port.
3. If there are additional components available for internal pull-up resistors or UHS SD
please check.