How to terminate unused data lines on MMC interface?

Igor Janjatovic

We are connecting MMC0 to SD Card connector where only MMC0_DAT0 to MMC0_DAT3 are used. Should we terminate MMC0_DAT4 to MMC0_DAT7 and how (pull-up?) or we just configure these as GPIO?

Thanks!

over 12 years ago

0 Biser Gatchev-XID over 12 years ago

TI__Guru**** 393215 points

Hi Igor,

You don't need to terminate them externally. You can use them for any other purpose you need, as long as you take into consideration their voltage domain. You can check the AM335X Starter Kit or Beaglebone schematics for a reference:

http://processors.wiki.ti.com/index.php/AM335x_Starter_Kit#Hardware_Documentation

http://beagleboard.org/static/beaglebone/latest/Docs/Hardware/BONE_SCH.pdf

And don't forget to add external pull-ups on CMD and DATA lines.

Best Regards

Biser

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How to terminate unused data lines on MMC interface?