Layerscape and MicroSD

[miha_at_work]

Hello.

I had made custom PCB with LS2084. When I did it I used LS2088ARDB-PA-DF schematic diagram as a reference. I have a question about level translators for SD card. As I see U205 and U206 (TXBN0304RSVR) and ST6G3244MEBJR is used instead. Will SD card work if I will use TXBN0304RSVR (or TXS02612)? I can't use ST6G3244MEBJR because it have too little BGA pitch. We will use SD card as boot device.

[Pavel]

Use SD card or MicroSD card as boot device.

Interface of MicroSD is the same as SD card.

Have a great day,
Pavel Chubakov

[Pavel]

See schematic from the LS1043ARDB-PC Design Files (REV PC ):

https://www.nxp.com/webapp/Download?colCode=LS1043ARDB-PC&appType=license

Have a great day,
Pavel Chubakov

[miha_at_work]

Can I use MicroSD as a boot device? Or is SD card desired?

[miha_at_work]

Thank you.

[Pavel]

The TXBN0304RSVR is used as level translator for SDHC signals on the LS1043ARDB board. See the LS1043ARDB schematic:

https://www.nxp.com/downloads/en/printed-circuit-boards/LS1043ARDB_PD-39019-DF.zip

It means that the TXBN0304RSVR on your board also.

Have a great day,
Pavel Chubakov

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[miha_at_work]

I had look at the LS1043ARDB schematic and it's BOM and I found there no any TXBN0304RSVR. On page 15 of document SPF-39019_F.pdf SDHC signals are connected to SD/MMC connector (5911M5001-LF) directly.

[miha_at_work]

*As I see U205 and U206 (TXBN0304RSVR) are not populated and ST6G3244MEBJR is used instead.