[OMAP35x] MMC1 3v GPIO???

DavidVescovi

I found this wiki post very interesting:

http://tiexpressdsp.com/index.php/Additional_Configuration_for_GPIO120-129_on_OMAP35x

My question is if I configure MMC1 as 4 bit SD (3v) can I use GPIO 126-129 as GPIO i.e. Input and Output?

If so does this mean if I set the PBIAS register correctly for these bits I can actually get 4 bits of 3v tolerent GPIO?

If so what would be the GPIO output voltage swing? What would be the input voltage tolerence? Can I actually use these bits to interface to a 3.3 volt peripheral?

over 15 years ago

0 DavidVescovi over 15 years ago

Genius 5470 points

Additionally the TRM indicates the PBIASLITEPWRDNZ1 bit in the PBIASLITE register is associated with VDD_SIM and not VDD_MMC1a? Is this a misprint?

PBIASLITEVMODE1 in the wiki posting seems to indicate the PBIASXXXXX1 bits are associated with the VDD_SIM supply and not the VDD_MMCa supply?

0 DavidVescovi over 15 years ago in reply to DavidVescovi

Genius 5470 points

sorry I ment to say in the previous posting:

PBIASLITEVMODE1 in the wiki posting seems to indicate the PBIASXXXXX1 bits are associated with the VDD_MMC1a supply and not the VDD_SIM supply?

0 Brad Griffis over 15 years ago in reply to DavidVescovi

TI__Guru*** 125430 points

You are right that VDD_SIM is a typo and should be VDD_MMC1a.

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[OMAP35x] MMC1 3v GPIO???