DRA80M: SDIO Configuration for eMMC

Keith Ahern

Part Number: DRA80M

I am using MMC0 to interface with an eMMC @ 3.3V. I am not using MMC1.

I currently have VDDS7 being supplied by CAP_VDDA_1P8_IOLDO0 and VDDS6 being supplied by CAP_VDDA_1P8_SDIO.

(1) Should I be using the SDIO LDO when using eMMC or is it only intended for an SD Card?

(2) Do I configure MCU_BOOTMODE_09 as '0' (MMC0) even though I am operating the I/O @ 3.3V?

(3) If the answer is to not use the SDIO LDO (change VDDS6 to CAP_VDDA_1P8_IOLDO1) - how should MCU_BOOTMODE_09 be configured?

0 Stanislav Stilyanov over 7 years ago

Hi Keith,

I might not be able to answer all your questions. I've looked into the ISK EVM schematics and my understanding is as follows.

1) SDIO LDO is used for SD card (MMC1) there

2) MCU_BOOTMODE09 is set to 1 (MMC1)

3) My understanding is that MCU_BOOTMODE9 should select the MMC (0 or 1) whose IOs are powered by SDIO LDO.

Please see if these diagrams from the datasheet and TRM will be of help:

Regards,

Stan

0 Stanislav Stilyanov over 7 years ago in reply to Stanislav Stilyanov

Hi,

I haven't heard back from you, I'm assuming you were able to resolve your issue.

If not, just post a reply below (or create a new thread if the thread has locked due to time-out).

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