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i.MX7D USDHC BOOT/VSELECT and Ethernet2/ELCDIF Pin questions

Question asked by Lars Heinrichs on Apr 6, 2018
Latest reply on Apr 6, 2018 by igorpadykov

Hello all,

 

I am planning to use all 3 uSDHC interfaces for a new i.MX7D Design.

They will be used for: eMMC, WiFi Module, SD Card.

Is there a possible setup that allows booting from SD card if inserted and from eMMC else? (Without additional ICs) Maybe this could be done in uboot?

Also, what is the purpose of the VSELECT pin? Would it be used to control e.g. the PF3000 PMIC VCC_SD Pin? Is it only used as a flag? What may happen if i decide to ignore this pin?

 

Having the 24 Bit LCD Interface and double ethernet available would be awesome as well.
Unfortunately, LCD_RD_E and RGMII_TX_CTL are muxed to the same pin, with no alternatives. TX_CTL is used in RMII and RGMII modes, so there is no way to not use it. Is it impossible to use both at the same time? I have found an MX7 Module that provides 2x Gigabit Ethernet and the LCD interface, it uses a DSI<->LVDS converter

 

Regards,
Lars

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