DM3725: MMC3 Pin Mux Confusion

Ryan.Bishop

Part Number: DM3725

Hello,

A customer has tested their EMMC interface and verified it is working correctly, but their pinout doesn't match our PinMux utility. It appears to be some mix of mode2 and mode3. Is it possible to have them intermixed like this? Or is there some other explanation for this?

Thank you!

	pinout on customer validation board	pin mux utility mode 2	pin mux utility mode 3
EMMC_CLK	AF10	AF10	AB1
EMMC_CMD	AE10	AE10	AC3
EMMC_DATA0	AE4	AE11	AE4
EMMC_DATA1	AH3	AH9	AH3
EMMC_DATA2	AF3	AF13	AF3
EMMC_DATA3	AE13	AE13	AE3
EMMC_DATA4	AF11	AF11
EMMC_DATA5	AG9	AG9
EMMC_DATA6	AF9	AF9
EMMC_DATA7	AH14	AH14

MMC3

over 6 years ago

0 Pavel Botev over 6 years ago

TI__Guru**** 170625 points

Hi Ryan,

Do you suspect some bug in the DM37x pinmux tool?

Regards,
Pavel

0 Ryan.Bishop over 6 years ago in reply to Pavel Botev

TI__Expert 3900 points

Hi Pavel,

I don't necessarily think it's a bug in the tool, but more a lack of understanding on my part in regards to configuring the pins.

Can each pin be assigned a function from a different mode? Or does the whole device have to be residing in one mode, with all the pin assigned to that mode's function?

From the table above, it looks like some of the pins are using mode 2 function while a few are using mode 3 function. Can you confirm this is normal operation?

Thank you!
Ryan B.

0 Pavel Botev over 6 years ago in reply to Ryan.Bishop

TI__Guru**** 170625 points

Ryan.Bishop said:
From the table above, it looks like some of the pins are using mode 2 function while a few are using mode 3 function. Can you confirm this is normal operation?

Yes, I think this is correct. I do not see any obstacle to use EMMC_CLK (pin AF10, mmc3_clk) in mode 2 and in the same time EMMC_DATA0 (pin AE4, mmc3_dat0) in mode 3. If something is not correctly configured, the pinmux tool will mark it in RED. Check the below wiki:

processors.wiki.ti.com/index.php

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DM3725: MMC3 Pin Mux Confusion